A trait genetically determined by an allele located on the sex chromosome is called what?

A trait genetically determined by an allele located on the sex chromosome is called what?

• A. Sex-linked traits
• B. Mitosis
• C. Chromosome
• D. Pedigree chart

Answer: (A)

Traits determined by an allele located on a sex chromosome are called sex-linked traits. These genes sit on the X or Y chromosome, so their inheritance follows patterns different from autosomal genes. In many species, including humans, males have one X chromosome, so a single recessive allele on that X can be expressed in a male, whereas females would need two copies to show the trait. This explains why these traits often show a male-biased pattern and have distinctive inheritance seen in pedigrees. Classic examples include color blindness and hemophilia. The other terms describe processes, structures, or tools that do not name a trait tied to sex chromosomes.

Traits determined by an allele located on a sex chromosome are called sex-linked traits. These genes sit on the X or Y chromosome, so their inheritance follows patterns different from autosomal genes. In many species, including humans, males have one X chromosome, so a single recessive allele on that X can be expressed in a male, whereas females would need two copies to show the trait. This explains why these traits often show a male-biased pattern and have distinctive inheritance seen in pedigrees. Classic examples include color blindness and hemophilia. The other terms describe processes, structures, or tools that do not name a trait tied to sex chromosomes.