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WAEC Biology 2002 Question 55

Question 55

Chromosomes, DNA and Sex Linkage

In humans, sex is determined by

  1. A.two homologous chromosomes
  2. B.a dominant gene for maleness present in a male
  3. C.two similar sex chromosomes in the male and dissimilar in the female
  4. D.the differences in the nature of the X and Y chromosomes in the male.
Show the answer and explanation

Answer: D (the differences in the nature of the X and Y chromosomes in the male.)

Explanation

Females are XX and males are XY. The father's sperm carries either X or Y, and this decides the child's sex.