Primordial sex cell in vertebrates originates from
A
Ectoderm
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B
Mesoderm
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C
Endoderm
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D
None of the above
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Solution
The correct option is A Ectoderm
Primordial germ cells have been isolated from the epiblast at the posterior end of the primitive streak in the second week. Epiblast itself is derived from ectoderm. Earlier it was believed that the primordial germ cell are derived from the endoderm of yolk sac wall, but now it is established that they are derivative of epiblast which is further the derivative of ectoderm.