Sex Linked Inheritence

Thus, identifying a sex-linked trait in mice is strong evidence that a similar trait, and underlying gene, exists on the human X chromosome. In contrast, a female must inherit two mutant alleles, a less frequent event since the mutant allele is rare in the population. Genes in the differential region of the X show an inheritance pattern called X linkage ; those in the differential region of the Y show Y linkage. These differential regions contain genes that have no counterparts on the other sex chromosome. MESSAGE Sex-linked inheritance regularly shows different phenotypic ratios in the two sexes of progeny, as well as different ratios in reciprocal crosses. Inheritence of Sex Chromosomes in Mammals.

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Sex Linked Inheritence
Sex Linked Inheritence

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The term 'color-blind' is not completely accurate. But the Z-chromosome has many sex-linked genes, including genes that control feather color and color intensity. Genes on the X or Y chromosome are called sex-linked.
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