How sex of an offspring determined in humans?

In humans, the type of male haploid gamete that fuses with the female egg determines the child's sex.

Males create two types of gametes during spermatogenesis: half have an X chromosome and the other half have a Y chromosome.

An X chromosome is always present in a female egg.

The child will be female if the male gamete with the X chromosome unites with the female egg, and male if the male gamete with the Y chromosome fuses with the female egg.

As sex chromosomes, human females possess two copies of the X chromosome, which they pass on to both male and female offspring.

Human males, on the other hand, have one X and one Y chromosome as sex chromosomes. If the father transmits "X" to the child, the child's sex will be female (XX), and she will be born as a girl. If the child receives "Y" from the father, the child will have a male offspring (XY).

As a result, in humans, the sex of the child/offspring/progeny is determined by the type of sex chromosome carried by the father. Hence the correct answer is option D sex chromosome of father.