alleryStart learning →A gene is described as X-linked when it sits where?
AOn the X chromosome but not on the Y
BOn both the X and the Y chromosome
COn an autosome next to the sex pair
DOn the Y chromosome but not on the X
Answer & Solution
Correct answer: A. On the X chromosome but not on the Y
1. The Y chromosome shares a small region with the X so that the two can pair during meiosis.
2. Outside that region the Y is much shorter and carries many fewer genes.
3. A gene present on the X but not on the Y is said to be X-linked.
4. A gene on both chromosomes would behave like an ordinary autosomal gene in both sexes.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 12 "Mendel's Experiments and Heredity", section 12.2 Characteristics and Traits_
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