Question

What is the definition of cleavage ?

A) Division of the unicellular egg into two cells.
B) Formed when the cells of the blastula fold inward- two cell layers.
C) Cell division proceeds until a hollow ball of cells forms.
D) Fetus begins development in an egg casing, hatches in the mother, and is birthed live.

Answer 1

Cleavage is the process of rapid cell division in embryonic development, which leads to the formation of a blastula. During cleavage, the cells divide without an increase in size, forming multiple smaller cells called blastomeres.

Step-by-step explanation:

Cleavage is a process in embryonic development in which the zygote undergoes rapid cell division to form a blastula. During cleavage, the cells divide without an increase in size, resulting in multiple smaller cells called blastomeres. These blastomeres then arrange themselves to form a hollow ball of cells called a blastula.