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What are 'sex-linked traits'?

  1. Genes carried by autosomes

  2. Genes carried by sex chromosome

  3. More than two alleles for one gene

  4. Traits controlled by more than one gene

The correct answer is: Genes carried by sex chromosome

Explanation Sex-linked traits are traits that are influenced by genes located on the X and Y sex chromosomes, hence the name "sex-linked." The other options are incorrect because: - A: Genes carried by autosomes refer to any non-sex chromosomes, therefore it is not specific to the X and Y chromosomes. - C: More than two alleles for one gene, while it may be true for some traits, is not the defining characteristic of sex-linked traits. - D: Traits controlled by more than one gene can also be found on autosomes, not just sex chromosomes.