An Introduction to the Study of Cytology
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In our eReader you can find the full English version of the book. Read An Introduction to the Study of Cytology 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 An Introduction to the Study of Cytology
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12, 13. Anaphase and telophase of the single polar division of the female producing egg.
ix] SINGLE POLAR DIVISION 127 modifications of the maturation divisions of partheno- genetic eggs do occur, the purpose of which, if one may speak thus ideologically, is to obviate this difficulty. The maturation processes vary in different cases, and it will be convenient to classify them under several heads.
(l) Maturation with One polar divjfijnn no rhrnmnsnmp reduction.
This may be regarded as the most ...typical mode of maturation of parthenogenetic eggs; it is found in the parthenogenetic Crustacea (Phyllopoda, Ostracoda), in the Aphids, in the paedogenetic ova of the Cecidomyid flies, and probably in at least the female-producing eggs of Rotifers. Although this type of maturation occurs in so many species, the details have been worked out in comparatively few, and there is room for much further investigation before our knowledge can be complete. It has long been known that in members of the groups mentioned the parthenogenetic eggs give off only one polar body, while the eggs that require fertilisation produce two, and it is a matter for surprise that more detailed work on the subject has not been undertaken.
What to read after An Introduction to the Study of Cytology?
You can find similar books in the "Read Also" column, or choose other free books by Leonard Doncaster to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
12, 13. Anaphase and telophase of the single polar division of the female producing egg.
ix] SINGLE POLAR DIVISION 127 modifications of the maturation divisions of partheno- genetic eggs do occur, the purpose of which, if one may speak thus ideologically, is to obviate this difficulty. The maturation processes vary in different cases, and it will be convenient to classify them under several heads.
(l) Maturation with One polar divjfijnn no rhrnmnsnmp reduction.
This may be regarded as the most ...typical mode of maturation of parthenogenetic eggs; it is found in the parthenogenetic Crustacea (Phyllopoda, Ostracoda), in the Aphids, in the paedogenetic ova of the Cecidomyid flies, and probably in at least the female-producing eggs of Rotifers. Although this type of maturation occurs in so many species, the details have been worked out in comparatively few, and there is room for much further investigation before our knowledge can be complete. It has long been known that in members of the groups mentioned the parthenogenetic eggs give off only one polar body, while the eggs that require fertilisation produce two, and it is a matter for surprise that more detailed work on the subject has not been undertaken.
What to read after An Introduction to the Study of Cytology?
You can find similar books in the "Read Also" column, or choose other free books by Leonard Doncaster to read onlineMoreLess
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