Assertion :Holoblastic cleavage with almost equal sized blastomeres in characteristic of placental mammal. Reason: Eggs of most mammals including humans are centrolethial.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Humans have holoblastic cleavage which means that blastomeres divide completely into two and are equal in size and therefore the assertion is correct.
The eggs of mammals are not centrolecithal in nature, they are microlecithal as they have very less amount of yolk present in them, therefore the reason is incorrect.
So, the correct option is ' Assertion is correct but the reason is incorrect.'

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