Footnotes to Evolution : a Series of Popular Addresses On the Evolution of Life
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In our eReader you can find the full English version of the book. Read Footnotes to Evolution : a Series of Popular Addresses On the Evolution of Life Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Footnotes to Evolution : a Series of Popular Addresses On the Evolution of Life
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,, , , ,, „, germ cells from other cells. The germ cell in the higher creatures gains characters and quali- ties of its own not possessed by the other cells of the body. As the character of double parentage is retained in the development of the higher animals and plants, it too is specialized and perfected. " Nature," says Weis- mann, " has no better way of encouraging variation than by preventing individual units from developing alone." In the germ cell of the female, known as the egg or ovum,... food yolk is deposited for the use of the young organism. This burden reduces the activity of the fe- male cell. It becomes sessile and motionless. Its cog- nate, the male germ, on the other hand, is specialized to seek the egg cell. It is made up of an almost bare nucleus to which is attached a vibratile structure which gives it the power to move.
This differentiation of sex in the germ cell produces changes and reactions in the organism from which it proceeds. The egg-bearing sex becomes in comparison with the other sessile, expectant, conservative.
What to read after Footnotes to Evolution : a Series of Popular Addresses On the Evolution of Life?
You can find similar books in the "Read Also" column, or choose other free books by Jordan David Starr to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
,, , , ,, „, germ cells from other cells. The germ cell in the higher creatures gains characters and quali- ties of its own not possessed by the other cells of the body. As the character of double parentage is retained in the development of the higher animals and plants, it too is specialized and perfected. " Nature," says Weis- mann, " has no better way of encouraging variation than by preventing individual units from developing alone." In the germ cell of the female, known as the egg or ovum,... food yolk is deposited for the use of the young organism. This burden reduces the activity of the fe- male cell. It becomes sessile and motionless. Its cog- nate, the male germ, on the other hand, is specialized to seek the egg cell. It is made up of an almost bare nucleus to which is attached a vibratile structure which gives it the power to move.
This differentiation of sex in the germ cell produces changes and reactions in the organism from which it proceeds. The egg-bearing sex becomes in comparison with the other sessile, expectant, conservative.
What to read after Footnotes to Evolution : a Series of Popular Addresses On the Evolution of Life?
You can find similar books in the "Read Also" column, or choose other free books by Jordan David Starr to read onlineMoreLess
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