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WAEC Biology 1994 Question 56

Question 56

Mendelian Inheritance

In human beings the albino trait it recessive and the normal skin colour is dominant. Therefore the probability of parents that are heterozygous for albinism, having an albino child is

  1. A.1/4
  2. B.1/2
  3. C.1/3
  4. D.2/3
  5. E.1
Show the answer and explanation

Answer: A (1/4)

Explanation

Aa × Aa gives AA, Aa, Aa, aa; only aa (1 in 4) is albino.