alleryStart learning →In birds the female carries the non-homologous sex chromosomes. What follows for sex-linked traits in birds?
AThey are seen more often in male birds
BThey cannot be inherited by either sex
CThey are seen more often in female birds
DThey are always lethal in the female bird
Answer & Solution
Correct answer: C. They are seen more often in female birds
1. The sex that carries the non-homologous pair is hemizygous for genes on those chromosomes.
2. In all birds that sex is the female rather than the male.
3. A hemizygous individual needs only one copy of a recessive allele to show the trait.
4. Sex-linked traits are therefore more likely to appear in female birds.
5. The logic is identical to the human case, only with the sexes swapped.
_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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