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Embryonic Development
Embryonic Development - All the events which change a zygote into a fully developed organism is called embryonic development. The entire process of development is called embryogenesis. Von Bear is called the "Father of Modern Embryology". ..
Embryonic Development
All the events which change a zygote into a fully developed organism is called embryonic development. The entire process of development is called embryogenesis. Von Bear is called the "Father of Modern Embryology". Embryonic Development in..
Phylum Mollusca
Phylum Mollusca - Free living aquatic forms (freshwater or marine), some amphibious. Body is soft and unsegmented enclosed in a glandular mantle covered by usually a shell. Coelom is reduced to a pericardial cavity around the heart. Digestive system is complete. Respiratory organs are in ..
Phylum Mollusca - Free living aquatic forms (freshwater or marine), some amphibious. Body is soft and unsegmented enclosed in a glandular mantle covered by usually a shell. Coelom is reduced to a pericardial cavity around the heart. Digestive system is complete. Respiratory organs are in ..Reproduction and Development Summary
. The first half of the phase and the changes in these phases are controlled by estrogens and progesterone. The secretion of these hormones occur cyclically because of the cyclic secretions of pituitary gonadotropins in the female. The fertilised ovum in mammals and other higher animals passes thro..
Function
It acts as an extra embryonic lung and helps in exchange of gases. It also plays an important part in embryonic respiration, excretion and nutrition by developing into a placen..
Yolk Sac
It is well developed in reptiles, birds and prototherians. It is mainly digestive in function so it acts as an extra embryonic gut. In human beings it is vestigi..
Cell Division
Cell division forms a mode of reproduction in unicellular organisms. In multicellular organisms it is responsible for embryonic development and growth of the adult organism. It is also involved in repair and regeneration. Both asexual and sexual reproduction requires cell divisi..
Developoment and Differentiation
Differentiation is the process by which the unspecialised embryonic cells change in structure and function during development and growth of an organism to form specialised cell types, tissues, and organs, distinct from one another. Differentiation makes cells of the same g..
Cell Division
Cell division forms a mode of reproduction in unicellular organisms. In multicellular organisms it is responsible for embryonic development and growth of the adult organism. It is also involved in repair and regeneration. Both asexual and sexual reproduction requires cell ..
Blastula
As the cells of the morula continue to divide, a cavity appears inside the morula. It forms the blastocoel. It separates a surface layer of blastomeres from an inner cell mass. The blastomeres on the surface of the embryo become flattened and form the trophoectoderm or trophoblast. This layer on fu..
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