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JAMB Biology 2006 Question 19

Question 19

Chromosomes, DNA and Sex Linkage

The two normal types of sex chromosomes are

  1. A.XXY and XYY
  2. B.XX and XYY
  3. C.XY and XXY
  4. D.XX and XY
Show the answer and explanation

Answer: D (XX and XY)

Explanation

Normal females are XX and normal males are XY. XXY and XYY are abnormal conditions.