The Production of Two Kinds of Spermatozoa in Phylloxerans - Functional ...
The Production of Two Kinds of Spermatozoa in Phylloxerans - Functional ...
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In our eReader you can find the full English version of the book. Read The Production of Two Kinds of Spermatozoa in Phylloxerans - Functional ... 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 The Production of Two Kinds of Spermatozoa in Phylloxerans - Functional ...
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56-57.
30 (286) The production of two kinds of spermatoxoa in phylloxerana — ftinctional ** female producing " and rudimentary spermatozoa.
By T. H. HOBGAN.
[from the Laboratory of Experimental Zoology^ Columbia University.'] The work of McClung, Stevens, and Wilson has shown in the group of insects that sex-determination is associated with the presence of two kinds of spermatozoa — "male and female pro- ducing.'* From this point of view sex is determined by the sperm and not by the eggs in tho...se species of insects in which parthenogenesis does not occur. Within the group of insects there are other species in which parthenogenesis appears as a part of the regular life-cycle. Such cycles are shown especially in the groups of aphids and phylloxerans. In these, all of the ferti- lized eggs produce females only, while from the parthenogenetic eggs both males and females develop. Hence it is evident that, in these groups at least, the egg may be sex-determining, but how this could take place has not been discovered.
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To quickly assess the difficulty of the text, read a short excerpt:
56-57.
30 (286) The production of two kinds of spermatoxoa in phylloxerana — ftinctional ** female producing " and rudimentary spermatozoa.
By T. H. HOBGAN.
[from the Laboratory of Experimental Zoology^ Columbia University.'] The work of McClung, Stevens, and Wilson has shown in the group of insects that sex-determination is associated with the presence of two kinds of spermatozoa — "male and female pro- ducing.'* From this point of view sex is determined by the sperm and not by the eggs in tho...se species of insects in which parthenogenesis does not occur. Within the group of insects there are other species in which parthenogenesis appears as a part of the regular life-cycle. Such cycles are shown especially in the groups of aphids and phylloxerans. In these, all of the ferti- lized eggs produce females only, while from the parthenogenetic eggs both males and females develop. Hence it is evident that, in these groups at least, the egg may be sex-determining, but how this could take place has not been discovered.
What to read after The Production of Two Kinds of Spermatozoa in Phylloxerans - Functional ...?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Hunt Morgan to read onlineMoreLess
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