Multiple choice

In a family, having a history of genetic disorders, knowing the sex of a foetus can be important because

  1. sons will be more prone to autosomal defects

  2. daughters will be more prone to autosomal defects

  3. both son & daughter will be equally affected

  4. There will be more chances that sons will bear X-linked traits expressed in their phenotype.
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D Correct answer
Explanation

There is a far greater probability of males expressing recessive alleles in their phenotypes if they are carried on X chromosomes. For females to have such traits, they would have to inherit the recessive allele for them on both of their X chromosomes.

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