Question

describe the post fertilization changes in human beings .
.... Only in 5 marks ......

Answer 1

Fertilization in Humans. When male gametes fuse with the female gametes, the entire process is fertilization in humans. This process results in the formation of a diploid zygote. In most animals, external fertilization takes place in an environment that is like their natural surroundings.

Answer 2

Gastrulation is the process of highly coordinated cell and tissue movements whereby the cells of the blastula undergo dramatic rearrangement. During gastrulation, the cells get specified new positions and the multi-layered body plan of the organism is specified. At the early stages of development, the embryo acquires a disc which consists of three layers. These layers are the ectoderm, mesoderm and endoderm.