In humans, sex is determined by

Biology

WAEC 2002

A. two homologous chromosomes
B. a dominant gene for maleness present in a male
C. two similar sex chromosomes in the male and dissimilar in the female
D. the differences in the nature of the X and Y chromosomes in the male.

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Correct Answer: Option D

Explanation

In humans, sex is determined by the difference in the nature of the X and Y chromosomes in males. Females have two of the same kind of sex chromosome (XX), while males have two distinct sex chromosomes (XY). The presence of the Y chromosome determines maleness because it carries the SRY gene, which triggers the development of male characteristics. The X chromosome carries genes related to both male and female sexual development.

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