How is human embryo development different from development of a hen’s embryo?
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Historically, the chicken embryo was one of the first embryos studied, readily ... The discovery that quail cells have a different nuclear appearance ... of limb development are largely conserved in mammals, including humans, ...
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The difference lies between oviparous [hens] and viviparous [humans] animals.
Explanation:
- In humans, after the formation of the zygote, cell division occurs as it travels down the oviducts. Then the embryo so formed embeds in the uterus wall developing into an individual.
- In hens, after the formation of the zygote, cell division occurs like in humans but as it travels down the oviducts, many protective layers are formed around it. The hard shell of the hen's egg is one such layer. The hen lays this egg and then sits on it to keep it warm. The warm embryo then further develops into a chick.
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