Vasoconstrictor
发表于 2025-3-26 23:27:00
Fertilization: How the Sleeping Egg Awakes,ryonic development, but it also has fundamental genetic consequences: the diploid (2.) state is restored and the paternal hereditary characters are introduced into the fertilized egg (also called the zygote). In most species, the sex of the future adult is established at fertilization.
recede
发表于 2025-3-27 02:57:29
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说不出
发表于 2025-3-27 08:27:40
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显而易见
发表于 2025-3-27 11:17:05
How Genes Direct the Synthesis of Specific Proteins in Living Cells,s which catalyze specific steps of this complex process. However, since we are dealing in this book with eggs and sperms, mention should first by made of . we shall then discuss specific protein synthesis in living cells. It should be emphasized at once that there is no such thing as a “typical” cel
施加
发表于 2025-3-27 16:56:01
How Eggs and Embryos Are Made,es that have been studied from the descriptive and experimental viewpoints by scores of embryologists over a period of 200 years or more. However, a few of the most salient findings must be outlined as briefly as possible before we can proceed further to underline the molecular mechanisms at work du
ETCH
发表于 2025-3-27 20:30:40
Gametogenesis and Maturation: The Formation of Eggs and Spermatozoa,l be progressively utilized until the embryo becomes capable of feeding itself. It is also a period of intensive genetic activity, which leads to the synthesis of many important macromolecules (RNA, proteins) which will be used at later stages of development only.
一瞥
发表于 2025-3-27 23:15:45
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brassy
发表于 2025-3-28 05:51:21
Egg Cleavage: A Story of Cell Division,leavage will be equal and total, unequal and total, partial or superficial. These differences are, in general, due to the fact that the yolk constitutes a barrier to the progress of the cleavage furrows which divide the egg into its blastomeres. This explanation is not, however, always satisfactory.
Neolithic
发表于 2025-3-28 08:21:54
Molecular Embryology of Invertebrate Eggs, We know much more about the biochemistry of regulative eggs, because their prototype is that of the sea urchin, which can be obtained easily in very large quantities. It is much more difficult to get enough egg material from most worms and mollusks for biochemical analysis. Therefore, our present k
巫婆
发表于 2025-3-28 13:20:18
Molecular Embryology of Amphibian Eggs, important studies have been made on the eggs of a fish, the loach . by Russian workers, and have been reviewed by Kafiani. Very little is known about the reptiles in the field of molecular biology. Considerable work has been done on chicken embryos, but at late stages of development. The partial cl