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JAMB Biology 2003 Question 40

Question 40

Chromosomes, DNA and Sex Linkage

If the pair of alleles for baldness is given as Bb, a female carrier will be denoted by

  1. A.XbY
  2. B.XBXB
  3. C.XBY
  4. D.XBXb.
Show the answer and explanation

Answer: D (XBXb.)

Explanation

A female has two X chromosomes. A carrier has one normal (B) and one recessive (b) allele: XBXb.