LIFE SCIENCE

Detailed explanation-1: -Both are having 50% of possibility. The answer should be B. Because a fertilized egg will recieve one sex chromosome from either parent. The mother will always give ano X chromosome and the father will have a 50% chance of giving either an X(will make a female child) or a Y(will cause the child to be male).

Detailed explanation-2: -The sex of an infant is determined by the type of sex chromosome contributed by the male gamete. Since the ratio of male gametes containing X chromosome and those containing Y chromosome is 50:50, the statistical probability of male or a female infant is also 50 : 50.

Detailed explanation-3: -Every egg has an X sex chromosome; a sperm can have either an X or a Y sex chromosome. 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-4: -There is only one pair of sex chromosome in a human cell which may be XX (for female) or XY (for male). If a sperm carrying chromosome X fertilizes the egg than the sex of the offspring will be female (XX). This is because the chromosome of an egg cell will always be X.