AP PSYCHOLOGY

Detailed explanation-1: -First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.

Detailed explanation-2: -The term morula is used to designate the ensuing stages of embryonic development (16, 32, and 64 cells). The morula is thus the product of the first cell cleavages, which result in practically no growth, because the daughter cells become smaller and smaller.

Detailed explanation-3: -Pregnancy week by week During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst.

Detailed explanation-4: -A zygote, also called a fertilized egg, is the phase of conception where the egg and sperm join to form a single cell. The zygote contains a full set of chromosomes, with 23 from the egg and 23 from the sperm.