Question

A change in the amount of yolk and its distribution in the egg will affect

• A. Formation of zygote
• B. Pattern of cleavage
• C. Number of blastomeres produced
• D. Fertilization

Answer 1

Answer: (B)

Pattern of cleavage

The pattern of cleavage is influenced by the amount of yolk in the egg. For example, in eggs with less yolk, cleavages are equal, and the resulting blastomeres are of similar size. If the yolk is localized, (as in frog cells), then the cleavages are unequal, i.e., the cells which are derived from the yolky region (the vegetal pole) are larger than those derived from the region without yolk (the animal pole)
So, the correct answer is 'Pattern of cleavage'