Question

In our society, women are blamed for producing female children. Choose the correct option for sex determination in humans.
A. Due to some defects like aspermia in man.
B. Due to the genetic makeup of some particular sperm which fertilizes the egg.
C. Due to the genetic makeup of the eggs.
D. Due to some defect in women.

Answer 1

In humans, the biological sex is determined by five factors which are present at birth, i.e. the presence or absence of Y chromosome, the sex hormones, the type of gonads, the structure of internal genitalia such as the uterus in females and external genitalia.

Complete solution:
Men (or sperm) determine the sex of a baby in humans. It depends on whether the sperm is carrying an X or a Y chromosome. When an X chromosome combines with the mother's X chromosome, the sex of the baby is female (XX) and when a Y chromosome combines with the mother's the sex of the baby is male (XY). In humans, female offspring inherit an X chromosome from each parent, whereas male offspring always inherit their X chromosome from their mother and Y chromosome from their father. In this system, commonly referred to as the XX-XY system, maleness is determined by the sperm cells that carry a Y chromosome. Sexual differentiation in a human being is the process of development of sexual differences. It is the development of phenotypic structures resulting from the action of hormones which are produced following gonadal determination. Sexual differentiation includes the development of different genital organs, the internal genital tracts and body hair which plays a role in gender identification.

So, the correct answer is B.

Additional Information: In the XY sex-determination system in humans, the development of sexual differences begins sometime after fertilization. Complex mechanisms lead to the development of phenotypic differences between male and female offspring from an undifferentiated zygote. Females usually have two X chromosomes, and males have a Y chromosome and an X chromosome.

Note: In many species, sex determination is a genetic process: male and female have different alleles or different genes that determine their sexual morphology. This is accompanied by the chromosomal differences in animals, through combinations of XY, ZW, XO, ZO chromosomes, or haplodiploidy. The sexual differentiation is triggered by a primary gene or a sex locus, with a multitude of other genes following in a domino effect.