Genes that appear on the X chromosome are said to be
A) X-linked.
B) autosomal recessive.
C) heterozygous.
D) homologous.
E) lethal.

Question

Quizplus · Accepted Answer

Genes that appear on the X chromosome are considered X-linked. This is because the X chromosome is one of the two sex chromosomes, with the other being the Y chromosome. Genes that are located on the autosomes (non-sex chromosomes) are considered autosomal genes. Therefore, option B is incorrect. Heterozygous refers to an individual who has two different alleles of the same gene on each of their homologous chromosomes. Option C is therefore incorrect. Homologous refers to chromosomes that are similar in size, shape, and genetic content. While X chromosomes are homologous with each other, this term does not accurately describe genes on the X chromosome. Option D is therefore incorrect. Genes that are lethal are ones that cause death or are responsible for a lethal phenotype. As such, option E is incorrect.

Genes That Appear on the X Chromosome Are Said to Be