noun, plural: Y linkages
In humans and other mammals, the sex chromosomes are the X chromosome and the Y chromosome. Females would have two X chromosomes and males have one X chromosome and one Y chromosome. As such, sex linkage may be classified as X linkage or Y linkage. X linkage is a sex linkage involving the X chromosome whereas Y linkage is a sex linkage involving the Y chromosome. Since there are more genes in the X chromosome than in the Y chromosomes there are more X-linked traits than Y-linked.
Y linkage is the state of a genetic factor (gene) being borne on the Y chromosome. Since the Y chromosome does not fully take part in chiasma formation and recombination, it is not amenable to analysis by conventional linkage methods. Thus, little is known about its content. There is a gene for the h-Y antigen, and indirect arguments suggest that there is a principle that determines the formation of the testis and masculinization of the fetus but its localization, though narrowing the limits, remains elusive.
- X linkage