How is the yolk sac made
How is the yolk sac made? What is the main function of the yolk sac?
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The yolk sac is made from the covering of vitellus by various cells originated from the primitive gut.
The yolk sac stock ups vitellus, the main nourishment source of non-placental embryos.
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This is the transmission of the qualities from ancestor to descendant through a mechanism lying primarily in the chromosomes of the germ cells. Heredity predisposes to certain physical, mental, and emotional states. It has been established through research on animals that physical and psychologic
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