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Home > Category Index for Science Quotations > Category Index R > Category: Reproduction

Reproduction Quotes (33 quotes)

...the genes almost always accurately reproduce. If they don't, you get one of the following results: One, monsters—that is, grossly malformed babies resulting from genetic mistakes. Years ago most monsters died, but now many can be saved. This has made possible the National Football League.
Found widely quoted on the web, but without a print source. Please contact webmaster if you know the primary source.
Science quotes on:  |  Gene (48)  |  Humour (96)  |  Monster (8)

A hen is only an egg's way of making another egg.
Attributed. In fact, Butler wrote in Life and Habit (1878), 134, of an existing saying that 'It has, I believe, been often remarked, that a hen is only an egg's way of making another egg.'
Science quotes on:  |  Egg (27)  |  Hen (2)

A large proportion of mankind, like pigeons and partridges, on reaching maturity, having passed through a period of playfulness or promiscuity, establish what they hope and expect will be a permanent and fertile mating relationship. This we call marriage.
Genetics And Man (1964), 298.
Science quotes on:  |  Bird (54)

A new species develops if a population which has become geographically isolated from its parental species acquires during this period of isolation characters which promote or guarantee reproductive isolation when the external barriers break down.
Systematics and the Origin of Species: From the Viewpoint of a Zoologist (1942), 155.
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A species is a reproductive community of populations (reproductively isolated from others) that occupies a specific niche in nature.
The Growth of Biological Thought: Diversity, Evolution and Inheritance (1982), 273.
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Birth, and copulation, and death.
That's all the facts when you come to brass tacks:
Birth, and copulation, and death
I've been born, and once is enough.
Sweeney Agonistes (1932), 24-5.
Science quotes on:  |  Birth (45)  |  Death (175)

Everyone admits that the male is the primary efficient cause in generation, as being that in whom the species or form resides, and they further assert that his genitures emitted in coitus causes the egg both to exist and to be fertile. But how the semen of the cock produces the chick from the egg, neither the philosophers nor the physicians of yesterday or today have satisfactorily explained, or solved the problem formulated by Aristotle.
Disputations Touching the Generation of Animals (1651), trans. Gweneth Whitteridge (1981), Chapter 47, 214.
Science quotes on:  |  Aristotle (99)  |  Egg (27)  |  Fertilization (11)

Five per cent vision is better than no vision at all. Five per cent hearing is better than no hearing at all. Five per cent flight efficiency is better than no flight at all. It is thoroughly believable that every organ or apparatus that we actually see is the product of a smooth trajectory through animal space, a trajectory in which every intermediate stage assisted survival and reproduction.
[Rebutting the Creationist assertion that fully developed organs could not have arisen 'by chance.']
The Blind Watchmaker (1986, 1996) 90-91.
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From the sexual, or amatorial, generation of plants new varieties, or improvements, are frequently obtained; as many of the young plants from seeds are dissimilar to the parent, and some of them superior to the parent in the qualities we wish to possess... Sexual reproduction is the chef d'oeuvre, the master-piece of nature.
Phytologia. (1800), 115, 103.
Science quotes on:  |  Evolution (332)

Generation by male and female is a law common to animals and plants.
Preface to Louis Ferdinand Compte de Marsilli's Histoire Physique de la Mer (1725), ix.
Science quotes on:  |  Animal (138)  |  Plant (93)

If there is any kind of animal which is female and has no male separate from it, it is possible that this may generate a young one from itself. No instance of this worthy of any credit has been observed up to the present at any rate, but one case in the class of fishes makes us hesitate. No male of the so-called erythrinus has ever yet been seen, but females, and specimens full of roe, have been seen. Of this, however, we have as yet no proof worthy of credit.
Aristotle
Generation of Animals, 741a, 32-8. In Jonathan Barnes (ed.), The Complete Works of Aristotle (1984), Vol. I, 1150.
Science quotes on:  |  Animal (138)

If we reflect that a small creature such as this is provided, not only with external members, but also with intestines and other organs, we have no reason to doubt that a like creature, even if a thousand million times smaller, may already be provided with all its external and internal organs... though they may be hidden from our eyes. For, if we consider the external and internal organs of animalcules which are so small that a thousand million of them together would amount to the size of a coarse grain of sand, it may well be, however incomprehensible and unsearchable it may seem to us, that an animalcule from the male seed of whatever members of the animal kingdom, contains within itself... all the limbs and organs which an animal has when it is born.
Letter to the Gentlemen of the Royal Society, 30 Mar 1685. In The Collected Letters of Antoni van Leeuwenhoek (1957), Vol. 5, 185.
Science quotes on:  |  Animal Kingdom (4)  |  Animalcule (8)  |  Creature (45)  |  Intestine (4)  |  Microorganism (19)  |  Organ (39)

It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.
[Concluding remark in the paper by Watson and Crick announcing discovery of the structure of DNA.]
In J.D. Watson and F.H.C. Crick, 'A Structure for Deoxyribose Nucleic Acid,' Letter in Nature (25 Apr 1953), 171, 738. Quoted in Francis Crick, What Mad Pursuit (1990), 66.
Science quotes on:  |  Genetics (78)  |  Structure Of DNA (4)  |  James Watson (16)

It is not always the magnitude of the differences observed between species that must determine specific distinctions, but the constant preservation of those differences in reproduction.
'Espece', Encyclopédie Methodique Botanique (1773-1789), Vol. 2, 396. In Pietro Corsi, The Age of Lamarck: Evolutionary Theories in France 1790- 1830, trans. J. Mandelbaum, (1988), 43.
Science quotes on:  |  Difference (129)  |  Species (91)

It is raining DNA outside. On the bank of the Oxford canal at the bottom of my garden is a large willow tree, and it is pumping downy seeds into the air. ... [spreading] DNA whose coded characters spell out specific instructions for building willow trees that will shed a new generation of downy seeds. … It is raining instructions out there; it's raining programs; it's raining tree-growing, fluff-spreading, algorithms. That is not a metaphor, it is the plain truth. It couldn't be any plainer if it were raining floppy discs.
The Blind Watchmaker (1986), 111.
Science quotes on:  |  DNA (48)

It may very properly be asked whether the attempt to define distinct species, of a more or less permanent nature, such as we are accustomed to deal with amongst the higher plants and animals, is not altogether illusory amongst such lowly organised forms of life as the bacteria. No biologist nowadays believes in the absolute fixity of species … but there are two circumstances which here render the problem of specificity even more difficult of solution. The bacteriologist is deprived of the test of mutual fertility or sterility, so valuable in determining specific limits amongst organisms in which sexual reproduction prevails. Further, the extreme rapidity with which generation succeeds generation amongst bacteria offers to the forces of variation and natural selection a field for their operation wholly unparalleled amongst higher forms of life.
'The Evolution of the Streptococci', The Lancet, 1906, 2, 1415-6.
Science quotes on:  |  Animal (138)  |  Bacteriologist (3)  |  Natural Selection (54)  |  Organism (66)  |  Plant (93)  |  Species (91)

It was to Hofmeister, working as a young man, an amateur and enthusiast, in the early morning hours of summer months, before business, at Leipzig in the years before 1851, that the vision first appeared of a common type of Life-Cycle, running through Mosses and Ferns to Gymnosperms and Flowering Plants, linking the whole series in one scheme of reproduction and life-history.
(1919). As quoted in E.J.H. Corner, The Life of Plants (1964).
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Leaving aside genetic surgery applied humans, I foresee that the coming century will place in our hands two other forms of biological technology which are less dangerous but still revolutionary enough to transform the conditions of our existence. I count these new technologies as powerful allies in the attack on Bernal's three enemies. I give them the names “biological engineering” and “self-reproducing machinery.” Biological engineering means the artificial synthesis of living organisms designed to fulfil human purposes. Self-reproducing machinery means the imitation of the function and reproduction of a living organism with non-living materials, a computer-program imitating the function of DNA and a miniature factory imitating the functions of protein molecules. After we have attained a complete understanding of the principles of organization and development of a simple multicellular organism, both of these avenues of technological exploitation should be open to us.
From 3rd J.D. Bernal Lecture, Birkbeck College London (16 May 1972), The World, the Flesh and the Devil (1972), 6. Collected in The Scientist as Rebel (2006), 292. (The World, the Flesh & the Devil: An Enquiry into the Future of the Three Enemies of the Rational Soul is the title of a book by J. D Bernal, a scientist who pioneered X-ray crystallography.)
Science quotes on:  |  Bioengineering (2)  |  DNA (48)  |  Technology (95)

Let us investigate more closely this property common to animal and plant, this power of producing its likeness, this chain of successive existences of individuals, which constitutes the real existence of the species.
'De la Reproduction en Générale et particulière', Histoire Naturelle, Générale et Particulière, Avec la Description du Cabinet du Roi (1749), Vol. 2, 18. Trans. Phillip R. Sloan.

Might one not say that in the chance combination of nature's production, since only those endowed with certain relations of suitability could survive, it is no cause for wonder that this suitability is found in all species that exist today? Chance, one might say, produced an innumerable multitude of individuals; a small number turned out to be constructed in such fashion that the parts of the animal could satisfy its needs; in another, infinitely greater number, there was neither suitability nor order: all of the later have perished; animals without a mouth could not live, others lacking organs for reproduction could not perpetuate themselves: the only ones to have remained are those in which were found order and suitability; and these species, which we see today, are only the smallest part of what blind fate produced.
'Essai de Cosmologie' in Oeuvres de Mr. De Maupertuis (1756), Vol. 1, 11-12. Quoted in Jacques Roger, The Life Sciences in Eighteenth-Century French Thought, ed. Keith R. Benson and trans. Robert Ellrich (1997), 381.
Science quotes on:  |  Evolution (332)  |  Fate (16)  |  Mouth (10)  |  Species (91)  |  Suitability (7)  |  Survival (30)  |  Survival Of The Fittest (28)

Natural selection based on the differential multiplication of variant types cannot exist before there is material capable of replicating itself and its own variations, that is, before the origination of specifically genetic material or gene-material.
'Genetic Nucleic Acid', Perspectives in Biology and Medicine (1961), 5, 7.
Science quotes on:  |  Difference (129)  |  DNA (48)  |  Gene (48)  |  Genetics (78)  |  Natural Selection (54)  |  Replication (3)  |  Variation (32)

No species … possesses a purpose beyond the imperatives created by genetic history … The human mind is a device for survival and reproduction, and reason is just one of its various techniques.
'Dilemma'. On Human Nature (1978, 1979), 2.
Science quotes on:  |  Genetics (78)  |  Human Mind (21)  |  Reason (172)  |  Species (91)  |  Survival (30)

Not only do the various components of the cells form a living system, in which the capacity to live, react, and reproduce is dependent on the interactions of all the members of the system; but this living system is identical with the genetic system. The form of life is determined not only by the specific nature of the hereditary units but also by the structure and arrangement of the system. The whole system is more than the sum of its parts, and the effect of each of the components depends on and is influenced by all previous reactions, whose sequence is in turn determined by the whole idiotype.
'Cytoplasmic Inheritance in Epilobium and Its Theoretical Significance', Advances in Genetics (1954), 6, 320.
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Our immediate interests are after all of but small moment. It is what we do for the future, what we add to the sum of man's knowledge, that counts most. As someone has said, 'The individual withers and the world is more and more.' Man dies at 70, 80, or 90, or at some earlier age, but through his power of physical reproduction, and with the means that he has to transmit the results of effort to those who come after him, he may be said to be immortal.
'Willis Rodney Whitney', National Academy of Sciences, Biographical Memoirs (1960), 360.
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Reproduction is so primitive and fundamental a function of vital organisms that the mechanism by which it is assured is highly complex and not yet clearly understood. It is not necessarily connected with sex, nor is sex necessarily connected with reproduction.
Psychology of Sex (1933), 7.
Science quotes on:  |  Sex (31)

Second Law
All the acquisitions or losses wrought by nature on individuals, through the influence of the environment in which their race has long been placed, and hence through the influence of the predominant use or permanent disuse of any organ; all these are preserved by reproduction to the new individuals which arise, provided that the acquired modifications are common to both sexes, or at least to the individuals which produce the young.
Philosophie Zoologique (1809), Vol. 1, 235, trans. Hugh Elliot (1914), 113.
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The reproduction of mankind is a great marvel and mystery. Had God consulted me in the matter, I should have advised him to continue the generation of the species by fashioning them of clay.
Martin Luther and William Hazlitt (trans.), Alexander Chalmers, The Table Talk of Martin Luther (1872), 307.
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The Reproductions of the living Ens
From sires to sons, unknown to sex, commence...
Unknown to sex the pregnant oyster swells,
And coral-insects build their radiate shells...
Birth after birth the line unchanging runs,
And fathers live transmitted in their sons;
Each passing year beholds the unvarying kinds,
The same their manners, and the same their minds.
The Temple of Nature (1803), canto 2, lines 63-4, 89-90, 107-10, pages 48-52.
Science quotes on:  |  Poem (75)

The succession of individuals, connected by reproduction and belonging to a species, makes it possible for the specific form itself to last for ages. In the end, however, the species is temporary; it has no “eternal life.” After existing for a certain period, it either dies or is converted by modification into other forms.
As translated by Joseph McCabe in Haeckel's The Wonders of Life: a Popular Study of Biological Philosophy (1904), 248.
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There is in Nature a general prototype in each species on which each individual is modeled, but which seems, in realizing itself, to alter itself or perfect itself according to circumstances. So that, relative to certain qualities, this is an extraordinary appearing variation in the succession of these individuals, and at the same time a constancy which appears wonderful in the entire species. The first animal, the first horse, for example, has been the external model and the interieur mold on which all horses which have been born, all those which now exist, and all those which will be born have been formed.
'Le Cheval', Histoire Naturelle, Générale et Particulière, Avec la Description du Cabinet du Roi (1753), Vol. 4, 215-6. Trans. Phillip R. Sloan.
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We are consuming our forests three times faster than they are being reproduced. Some of the richest timber lands of this continent have already been destroyed, and not replaced, and other vast areas are on the verge of destruction. Yet forests, unlike mines, can be so handled as to yield the best results of use, without exhaustion, just like grain fields.
Address to the Deep Waterway Convention, Memphis, Tennessee (4 Oct 1907), 'Our National Inland Waterways Policy'. In American Waterways (1908), 9.
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We are machines built by DNA whose purpose is to make more copies of the same DNA. ... This is exactly what we are for. We are machines for propagating DNA, and the propagation of DNA is a self-sustaining process. It is every living object's sole reason for living.
Royal Institution Christmas Lecture, 'The Ultraviolet Garden', (No. 4, 1991). Quoted in Vinoth Ramachandra, Subverting Global Myths: Theology and the Public Issues Shaping our World (2008), 187.
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You say Beasts are Machines like Watches? But put the Machine called a Dog, and the Machine called a Bitch to one another for some time, and there may result another little Machine; whereas two Watches might be together all their Life-time, without ever producing a third Watch. Now Madam de B— and I think, according to our Philosophy, that all things which being but two, are endued with the Virtue of making themselves three, are of a much higher Nature than a Machine.
'Letter XI to Mr. C: Upon his studying the Philosophy of Descartes', Letters of Gallantry (1685), trans. Mr Ozell (1715), 25.
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Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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Sophie Germain
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Ernest Rutherford
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Carl Gauss
Paul Feyerabend
- 90 -
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Euclid
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Frederick Banting
Andre Ampere
Winston Churchill
- 80 -
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Bertrand Russell
Jean Lamarck
- 70 -
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John Wheeler
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Robert Fulton
Pierre Laplace
Humphry Davy
Thomas Edison
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Theodore Roosevelt
Carolus Linnaeus
- 60 -
Francis Galton
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- 40 -
Pierre Fermat
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