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Question
Recessive gene present on one X chromosome of humans will be
Recessive gene present on one X chromosome of humans will be
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Solution
The correct option is C Expressed in males
A recessive gene, if lethal, can express its lethal effect only when present in two copies. As the human male is heterogametic and carries “XY” sex chromosome while female carries two copies of X-chromosomes (XX) as sex chromosomes. A recessive gene needs to be present in the homozygous state (two copies) to express its effect. Therefore, the human female can express a recessive trait only when it is present on both X-chromosomes. Being hemizygous, human males can express a recessive gene also. Thus, the correct answer is option C.
A recessive gene, if lethal, can express its lethal effect only when present in two copies. As the human male is heterogametic and carries “XY” sex chromosome while female carries two copies of X-chromosomes (XX) as sex chromosomes. A recessive gene needs to be present in the homozygous state (two copies) to express its effect. Therefore, the human female can express a recessive trait only when it is present on both X-chromosomes. Being hemizygous, human males can express a recessive gene also. Thus, the correct answer is option C.
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