AP BIOLOGY

Detailed explanation-1: -The process of cell division is termed cleavage that forms blastula from the zygote. Blastocyte is then implanted that forms trophoblast in which cells are arranged in two layers as inner and outer cell mass. The early embryo is formed by gastrulation of the three germinal layers that contain 32 cells.

Detailed explanation-2: -For the first 12 hours after conception, the fertilized egg remains a single cell. After 30 hours or so, it divides from one cell into two. Some 15 hours later, the two cells divide to become four. And at the end of 3 days, the fertilized egg cell has become a berry-like structure made up of 16 cells.

Detailed explanation-3: -There will be 32 cells after a zygote goes through 5 mitotic cell divisions.

Detailed explanation-4: -Answer and Explanation: where N is the final number of cells and n is the number of divisions that occurs. The correct answer to this question then is d. 16.

Detailed explanation-5: -A zygote, also known as a fertilized ovum or fertilized egg, is the union of a sperm cell and an egg cell. The zygote begins as a single cell but divides rapidly in the days following fertilization. The zygote’s single cell contains all of the 46 necessary chromosomes, getting 23 from the sperm and 23 from the egg.