The condition in which one of more genes that have no allelic counterpart is known as:
Correct answer: B. Hemizygous
- A. Homozygous
- B. Hemizygous
- C. Heterozygous
- D. Incomplete dominance
Explanation
Hemizygous means having only a single copy of a gene instead of the customary two copies. All the genes on the single X chromosome in the male are hemizygous. Homozygous means having 2 identical alleles of a particular gene. Heterozygous means having 2 different alleles of a particular gene. Incomplete dominance is a form of Gene interaction in which both alleles of a gene at a locus are partially expressed, often resulting in an intermediate or different phenotype. The correct answer is, therefore, B.
This question appeared on the HEC Phase II 2017 paper, which you can sit online with every answer explained.
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About X-linked Recessive Inheritance
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
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A woman with normal colour vision, whose father was red green colour blind, married a red green colour blind man. What is the probability of her born child being red green colour blind?
Which trait is not sex-linked recessive:
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Which of the following traits is transmitted directly from an affected father to only his son?