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WAEC Biology 1988 Question 46

Question 46

Mendelian Inheritance

Assuming that 'A' is gene for normal skin and it is dominant, while 'a' is gene for albinism and it is recessive, what is the likely genotype of a couple which had 50% normal and 50% albinos?

  1. A.AA,Aa
  2. B.AA,aa
  3. C.Aa, Aa
  4. D.Aa, aa
  5. E.AA,AA
Show the answer and explanation

Answer: D (Aa, aa)

Explanation

Aa × aa gives Aa and aa in equal numbers: half normal, half albino.