Age And Area a Study in Geographical Distribution And Origin of Species
Age And Area a Study in Geographical Distribution And Origin of Species
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For the first, no material change of the genes is required; they remain what they are. No two leaves on a tree are exactly alike; no tAvo individuals of a species are the same in exery detail. These two well-knoAvn propositions are the essence of what we now call fluctuating variability. In their visible features characters usually oscillate around a mean value, but this does not affect their material bearers. The researches of Quetelet and Galton have shown that such oscillations follow the la...w of chance. Starting from this idea, fluctuating variability of animals and plants has now become a main branch of bio- logical study.
Besides these, changes may be expected, which involve the material bearers of heredity, or the genes, themselves. Some may be lost, either really or apparently, and new ones may be added to the stock, this latter process consisting probably in the transformation of old genes into new types. In consequence of such changes the external features of an organism may become PT.
What to read after Age And Area a Study in Geographical Distribution And Origin of Species?
You can find similar books in the "Read Also" column, or choose other free books by J C John Christopher Willis to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
For the first, no material change of the genes is required; they remain what they are. No two leaves on a tree are exactly alike; no tAvo individuals of a species are the same in exery detail. These two well-knoAvn propositions are the essence of what we now call fluctuating variability. In their visible features characters usually oscillate around a mean value, but this does not affect their material bearers. The researches of Quetelet and Galton have shown that such oscillations follow the la...w of chance. Starting from this idea, fluctuating variability of animals and plants has now become a main branch of bio- logical study.
Besides these, changes may be expected, which involve the material bearers of heredity, or the genes, themselves. Some may be lost, either really or apparently, and new ones may be added to the stock, this latter process consisting probably in the transformation of old genes into new types. In consequence of such changes the external features of an organism may become PT.
What to read after Age And Area a Study in Geographical Distribution And Origin of Species?
You can find similar books in the "Read Also" column, or choose other free books by J C John Christopher Willis to read onlineMoreLess
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