(B) Epiboly is a morphogenetic movement during gastrulation in which a sheet of cells (micromeres) spreads over the surface of the embryo.In this proc

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Overgrowth when the micromeres divide rapidly and begin to spread downwards over the megameres except at the yolk plug

(B) Epiboly is a morphogenetic movement during gastrulation in which a sheet of cells (micromeres) spreads over the surface of the embryo.In this process,the micromeres divide rapidly and migrate downwards to cover the larger cells (megameres) of the vegetal hemisphere,except for a small area known as the yolk plug.Therefore,option $B$ is the correct description of epiboly.

Class 12 Biology Human Reproduction Pregnancy and Embryonic development

Medium

Epiboly is the process of

AIPMT 1992 All AIPMT

A
Mass migration of cells from the animal hemisphere so that upper micromeres begin to migrate over the edge of the dorsal lip and roll inside and are tucked beneath the outer layer
B
Overgrowth when the micromeres divide rapidly and begin to spread downwards over the megameres except at the yolk plug
C
Rotation of gastrula within the vitelline membrane so that the animal pole becomes anterior
D
Formation of a small slit-like invagination occurring on the gray crescent