Explain embryological evidences of evolution.

Answer: Embryological Evidences of Evolution.

All living organisms in their early developmental stages show presence of the following distinct features:

Embryological evidences

i. Development in sexually reproducing organisms begins from a single diploid cell stage, i.e. a fertilized egg or zygote.

ii. Zygote undergoes cleavage, blastulation and gastrulation. At the end of gastrulation, three germ layers are formed which give rise to various organs and organ systems.

iii. Embryos of different vertebrates, i.e. from fishes to mammals look alike particularly with reference to gill slits, gill clefts and tail.

From these similarities, it can be concluded that all these groups have evolved from the same ancestral stock.

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