Multiple choice

An unfertilized human egg contains

  1. one Y chromosome

  2. one X chromosome

  3. two X Chromosomes

  4. one X and one Y chromosome

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Human females have two X chromosomes (XX), while males have one X and one Y (XY). An unfertilized egg (ovum) always contains one X chromosome from the mother. Sperm can carry either X or Y chromosome, determining the baby's sex.