ANATOMY

Detailed explanation-1: -Cleavage and Morula Cell division with no significant growth, producing a cluster of cells that is the same size as the original zygote, is called cleavage. At least four initial cell divisions occur, resulting in a dense ball of at least sixteen cells called the morula.

Detailed explanation-2: -The cleavage can be either holoblastic (complete) or meroblastic (incomplete cleavage), depending on the amount of yolk in the egg. Similar to echinoderms, cleavage in frog embryos is generally radially symmetrical and holoblastic. The frog egg is mesolecithal in nature and has a lot of yolk.

Detailed explanation-3: -Cleavage is a period after fertilization, when a 1-cell embryo starts developing into a multicellular organism. It consists of a series of mitotic divisions, which divide the large volume of a fertilized egg into numerous smaller, nucleated cells-blastomeres. The pattern of cleavage divisions differs between species.

Detailed explanation-4: -Stage 1: Egg. Stage 2: Tadpole. Stage 3: Froglet (young frog) Stage 4: Adult frog.