Question

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

• A. formation of zygote
• B. fertilization
• C. number of blastomeres produced
• D. pattern of cleavage

Answer 1

The correct option is D

pattern of cleavage

The correct option is D.

Explanation of correct option:

1. Cleavage refers to a series of mitotic cell divisions by which the zygote is transformed into blastomeres.
2. The cleavage pattern is generally determined by the amount of yolk and its distribution in the egg.
3. Holoblastic cleavage occurs in eggs containing moderate to a scant amount of yolk.
4. In this type of cleavage, the egg divides completely. For example, the human egg.
5. Meroblastic cleavage occurs in eggs that contain a large amount of yolk.
6. Here, the egg doesn’t divide completely. For example, bird eggs.

Final answer: A change in the amount of yolk and its distribution in the egg will affect the pattern of cleavage.