NEET BIOLOGY

Detailed explanation-1: -Since the ratio of the X chromosome and Y chromosome in a male gamete is 50:50, the probability of male or female infants is also 50:50. Therefore the statistical probability of getting either a male or female child is 50:50 since the sex-determining male sperm has a 50:50 chance of bearing an X or Y chromosome.

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: -Summary. The sex ratio at birth is not equal: in every country births are male-biased. There are biological reasons why there are slightly more boys born every year than girls. The ‘natural’ sex ratio at birth is around 105 boys per 100 girls (ranging from around 103 to 107 boys).

Detailed explanation-4: -The ratio of male to female births, called the sex ratio, is about 105 to 100, according to the World Health Organization (WHO). This means about 51% of deliveries result in a baby boy.

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.