Question

what determines the sex of human offspring?

A. Timing

B. Temperature

C.The egg cell

D.The sperm cell

Answer 1

Answer-

D) The sperm cell determines the sex of human offspring.

In human, total number of chromosomes is 46 (in male 44 + XY and in female 44 + XX). Sperm produced by male are of two types: a) 22 + X, b) 22 + Y, whereas egg cell has 22 + X chromosomes.

The presence of Y chromosome triggers the embryonic gonads in the male pathway. Y chromosome has a critical gene that controls male sexual development, called the sex determining region Y (SRY) which triggers the undifferentiated gonadal tissue of the embryo to form testes. In the absence of Y chromosome, gonads of XX embryo retain their undifferentiated gonadal state that will proceed into ovaries.