Sex linkage describes the patterns of inheritance and presentation when a gene mutation an allele is present on a sex chromosome an allosome rather than a non-sex chromosome an autosome.
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From Wikipedia, the free encyclopedia. There 3. A functional second copy can often work well enough on its own, acting as a sort of back-up to prevent problems.
Inheritence of Sex Chromosomes in Mammals
Subsequently, the Y chromosome now has few active genes and mostly contains genetic junk rather than genes. Inheritence of Sex Chromosomes in Mammals. This paper helped to distinguish between these two similar concepts and clarify much confusion in the scientific community at the time. If both copies need to be the same one, then the trait is recessive.