AP BIOLOGY

Detailed explanation-1: -X-linked recessive inheritance refers to genetic conditions associated with mutations in genes on the X chromosome. A male carrying such a mutation will be affected, because he carries only one X chromosome. A female carrying a mutation in one gene, with a normal gene on the other X chromosome, is generally unaffected.

Detailed explanation-2: -Genes on the X chromosome can be recessive or dominant, so X-linked recessive genes are expressed in females only if there is one on each of her X chromosomes.

Detailed explanation-3: -X-linked recessive inheritance is a way a genetic trait or condition can be passed down from parent to child through mutations (changes) in a gene on the X chromosome. In males (who only have one X chromosome), a mutation in the copy of the gene on the single X chromosome causes the condition.

Detailed explanation-4: -Answer and Explanation: A human X-linked gene is c) found on the X chromosome. Males have the sex chromosomes XY, while females have XX. Sex-linked traits are those that are located on the X chromosome, so they can be present in both males and females.