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Answer :
Final answer:
The elephant seal's long nose appearing only in males is an example of a sex-limited trait, which are traits expresssed in only one sex. These traits are influenced by sex hormones and differential gene activation in males and females, separate from single-gene dominant-recessive traits.
Explanation:
The long protruding nose that develops only in male elephant seals, despite the same genotype for nose development in males and females, is an example of a Sex-limited trait. Sex-limited traits are characteristics that are expressed in only one sex, influenced by both the presence of specific sex hormones and the differential activation of genes in males and females.
Sex-limited traits should not be confused with sex-influenced traits, as the latter can be expressed in both sexes but are influenced by the sex of the individual. Sexual dimorphisms, like the peacock's tail or the elephant seal's nose, are often driven by sexual selection and can represent sex-limited traits. Bigger or more elaborate features can give an advantage in mating, either through male competition or through female choice.
Traits like cleft or smooth chin, which are influenced by a single gene, show a different mode of inheritance, with dominant and recessive traits expressed based on diverse combinations of parental genes. These do not represent sex-limited traits as they are not specifically associated with one sex.
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