Question

What kind of cleavage does a frog experience?

A) Frogs undergo holoblastic cleavage, where the entire egg is divided into smaller, individual cells during early development.
B) Frogs experience meroblastic cleavage, where only a portion of the egg undergoes division, forming a blastodisc.
C) Cleavage in frogs is asynchronous, resulting in cells dividing at different rates during embryonic development.
D) Frogs exhibit spiral cleavage, where the cells divide at an angle to the polar axis, leading to a distinct arrangement of cells.

Answer 1

Frogs undergo holoblastic cleavage where the entire egg is divided into smaller cells, called blastomeres, resulting in a blastula. This total division occurs despite the moderate amount of yolk in the frog's eggs. Thus, answer A is correct for the kind of cleavage in frogs.

Step-by-step explanation:

The kind of cleavage that a frog experiences is holoblastic cleavage. This means that the frog's egg undergoes complete division into smaller cells, known as blastomeres, during early development. Frogs have eggs with a moderate amount of yolk, which allows for this total cleavage process, differentiating them from species with high-yolk eggs that undergo meroblastic (partial) cleavage.

In holoblastic cleavage, the cells divide without an increase in mass, forming a multicellular structure without growth in size. The rapid mitotic division of the frog's zygote leads to the formation of a blastula, made up of blastomeres surrounding a fluid-filled or yolk-filled cavity called the blastocoel. Therefore, the accurate answer to the student's question is A) Frogs undergo holoblastic cleavage, where the entire egg is divided into smaller, individual cells during early development.