sex linkage



sex linkage defined in 1951 year

sex linkage - sex linkage;
sex linkage - Of a gene or character, having special distribution with reference to sex as a result of (in the case of a gene) being carried on the X-chromosome or (in the case of a character) controlled by a gene so carried. A man, for instance, receives his X-chromosome and therefore all his sex-linked genes from his mother; and he hands them on to his daughters (who also get an X-chromosome from their mother), not to his sons. Since in a man there is no partner to the X-chromosome, recessive genes on it cannot be masked by a dominant allelomorph, so that men manifest a larger number of recessive genes (like those for haemophilia or red-green colour-blindness) than women; and conversely a smaller number of dominant genes. What is true for men is true for the heterogametic sex of any organism. Sex-linkage must be distinguished from sex-limitation. Both sexes manifest a full set of sex-linked genes; but the homogametic sex, unlike the heterogametic sex, will only manifest a recessive gene if it has received it from both parents, which will be a rare event if the gene is uncommon in the population.

near sex linkage in Knolik


sex chromosomehome
letter "S"
start from "SE"
sex ratio

definition of word "sex linkage" was readed 769 times

Legal info