Sex-linked traits involve genes located on X or Y chromosomes.

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Multiple Choice

Sex-linked traits involve genes located on X or Y chromosomes.

Explanation:
Sex-linked traits are determined by genes on the sex chromosomes, X and Y. In humans, the X carries many genes, while the Y carries relatively few genes mainly related to male development. Because males have only one X, a single recessive allele on that chromosome will be expressed, since there isn’t a second X to mask it. Females have two X chromosomes, so a recessive trait often requires two copies to show up, though X-inactivation can modulate expression. Autosomes contain the remaining genes not tied to sex, while mitochondrial DNA (inherited from the mother) and chloroplast DNA (in plants) are separate genetic systems not located on sex chromosomes. So the statement aligns with the concept of sex chromosomes, making it the best fit.

Sex-linked traits are determined by genes on the sex chromosomes, X and Y. In humans, the X carries many genes, while the Y carries relatively few genes mainly related to male development. Because males have only one X, a single recessive allele on that chromosome will be expressed, since there isn’t a second X to mask it. Females have two X chromosomes, so a recessive trait often requires two copies to show up, though X-inactivation can modulate expression. Autosomes contain the remaining genes not tied to sex, while mitochondrial DNA (inherited from the mother) and chloroplast DNA (in plants) are separate genetic systems not located on sex chromosomes. So the statement aligns with the concept of sex chromosomes, making it the best fit.

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