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A man and his wife are both heterozyous for the sickle-cell trait. The likely percentage...

Biology
JAMB 2003

A man and his wife are both heterozyous for the sickle-cell trait. The likely percentage of their offspring that will be either carriers or sicklers is

  • A. 75%
  • B. 50%
  • C. 25%
  • D. 100%
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Correct Answer: Option A
Explanation

An heterozygote for sickle-cell anaemia = AS

Crossing two AS persons, we have one AA, two AS and one SS.

\(\therefore\) The probability that the children are either carriers or sicklers = \(\frac{3}{4}\)

= 75%


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