Multiple choice

What is unequal holoblastic cleavage?

Cleavage is the process of rapid, successive mitotic division of zygote into large cells within a period extending from fertilization to blastula or beginning of gastrulation. All divisions in cleavage are mitotic in nature with the rate of cleavage depending on species & temperature. Early cleavage is synchronous but a late cleavage of the cell division is asynchronous.

  1. It is the cleavage remains restricted to the periphery cytoplasmic region.

  2. It is the process of rapid, successive mitotic division of zygote into large cells.

  3. It is the type of cleavage, which is restricted in active cytoplasm of animal pole.

  4. It is the type of cleavage in mesolecithal and telolecithal eggs.

  5. It occurs into micro or isolecithal eggs resulting blastomere are approximately of equal size.
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D Correct answer
Explanation

In mesolecithal and telolecithal eggs due to polarization of yolk holoblastic cleavage produces unequal size blastomere including micromeres [small size blastomere] and macromere [large size] is called unequal holoblastic cleavage. E.g, lower fishes and amphibians.

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