Fertilization and early embryonic development in poultry.
There are two major controllers of development in the early stages of bird embryos. These are: 1) gravity, probably acting through the distribution of yolk and its components, which lays down the initial plans for polarity that are later established firmly through the genes; and 2) the primitive streak, which controls the orderly ingression of the cells and imposes a pattern on the developing tissues.
Department of Anatomy and Developmental Biology, University College London, England.
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Bellairs
D000818:Animals; D047108:Embryonic Development; D005306:Fertilization / Q000502:physiology*; D011200:Poultry / Q000196:embryology*