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Question

The recessive genes located on X - chromosomes in humans are always :
  1. Expressed in females
  2. Sub - lethal
  3. Lethal
  4. Expressed in males


Solution

The correct option is D Expressed in males
Males are hemizygous for the X chromosome, i.e., they have only one copy of every gene on the X chromosome.
Females, on the other hand, have two and thus, can be homozygous or heterozygous for any locus on this chromosome.
As a result, every X-linked gene is expressed in males as there is nothing to "mask" a recessive genotype, as there would be in females.

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