AP BIOLOGY

Detailed explanation-1: -If the sperm that fertilizes an egg has an X chromosome, the baby is female; if it has a Y chromosome, the baby will be a boy.

Detailed explanation-2: -In most cases, the female is XX and the male is XY. Every individual must have at least one X chromosome.

Detailed explanation-3: -If the X spermatozoon combines with the mother’s X chromosome, the resulting offspring is a baby girl (XX), whereas if Y spermatozoon fertilizes the mother’s oocyte, the resulting offspring is a baby boy (Gellatly, 2009).

Detailed explanation-4: -Each person normally has one pair of sex chromosomes in each cell. Females have two X chromosomes, while males have one X and one Y chromosome.

Detailed explanation-5: -Each time a sperm meets an ovum, there is a 50% chance that it will make a boy and a 50% chance that it will make a girl. It doesn’t matter what happened the time before that: each time an ovum is fertilized, this makes a new zygote that could be a boy or a girl.