In humans, there are hundreds of genes located on the X chromosome that have no counterpart on the Y chromosome. The traits governed by these genes thus show sex-linked inheritance. This type of inheritance has certain unique characteristics, which include the following: 1 There is no male-to-male father-to-son transmission, since sons will, by definition, inherit the Y rather than the X chromosome. The table lists some sex-linked conditions. The figure shows a pedigree of a family in which a mutant gene for hemophilia A, a sex-linked recessive disease, is segregating.
12.2E: Sex-Linked Traits
Sex-linked Inheritance - K12 LibreTexts
All rights reserved. A man receives all his sex-linked genes from his mother and transmits them all to his daughters but not to his sons; a recessive sex-linked character is much more likely to be expressed in the male. See also: sex chromosomes. Carried by a sex chromosome, especially an X chromosome. Used of genes. Published by Houghton Mifflin Company.
Mendel proposed that paired unit factors of heredity were transmitted faithfully from generation to generation by the dissociation and reassociation of paired factors during gametogenesis and fertilization, respectively. After he crossed peas with contrasting traits and found that the recessive trait resurfaced in the F 2 generation, Mendel deduced that hereditary factors must be inherited as discrete units. This finding contradicted the belief at that time that parental traits were blended in the offspring. A gene is made up of short sections of DNA that are contained on a chromosome within the nucleus of a cell.
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