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प्रश्न
Which of the following is common to both avian and mammalian development?
पर्याय
Holoblastic cleavage
Primitive streak
Trophoblast
Yolk plug
MCQ
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उत्तर
Primitive streak
Explanation:
The primitive streak is a structure that forms during early embryonic development and is common to both avian and mammalian development. It marks the beginning of gastrulation and the formation of germ layers. In contrast, holoblastic cleavage is typical in mammals but not all birds; trophoblast is specific to mammals; thus, primitive streak is common to both groups.
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