Question

The 32 cell stage of the human embryo is

• A. Smaller than the fertilized egg
• B. Same size as the fertilized egg
• C. Two times of the size of the fertilized egg
• D. Four times the size of the fertilized egg

Answer 1

Answer: (B)

Same size as the fertilized egg

The result of fertilization is the diploid zygote. Zygote then undergoes cleavage division. The cleavage results in the increase in the number of cells but the size remains the same as that of the fertilized egg. Morula with 16 cell divide mitotically and produces 32 cells. 32 celled stage is called as blastula and all the cells in blastula are same size as zygote.
Thus, the correct answer is option B.