NEET BIOLOGY

Detailed explanation-1: -cleavage, when zygote undergoes mitotic division. fertilization, when sperm enters in the cytoplasm of ovum. implantation, when blastocysts attached to the uterine endometrium.

Detailed explanation-2: -The single-celled zygote undergoes cleavage to form 2 cells. Its called cleavage because unlike normal mitosis, there is no growth phase between divisions. The embryo further divides to form 4 cells, which divide to form 8 and then 16 cells, and so on. These daughter cells that are formed are known as blastomeres.

Detailed explanation-3: -blastomere. noun. blas·to·mere ˈblas-tə-ˌmi(ə)r. : a cell produced during cleavage of a fertilized egg. called also cleavage cell.

Detailed explanation-4: -In biology, a blastomere is a type of cell produced by cell division (cleavage) of the zygote after fertilization; blastomeres are an essential part of blastula formation, and blastocyst formation in mammals.

Detailed explanation-5: -It is the first mitotic division of the fertilised ovum. After subsequent divisions a group of cells are formed, It is known as the blastomeres. The division results in a smaller cell as the size of the embryo does not increase. The 16 to 32 blastomere stage is known as a morula.