The figure shows a pedigree of a family in which a mutant gene for hemophilia A, a sex-linked recessive disease, is segregating. The table lists some sex-linked conditions. (4) Most sex-linked traits are recessively inherited, so that heterozygous females generally do not display the trait. (3) Males with the trait will pass the gene on to all of their daughters, who will be carriers. (2) The carrier female (heterozygote) has a 50 percent chance of passing the mutant gene to each of her children sons who inherit the mutant gene will be hemizygotes and will manifest the trait, while daughters who receive the mutant gene will be unaffected carriers. 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 traits governed by these genes thus show sex-linked inheritance. In humans, there are hundreds of genes located on the X chromosome that have no counterpart on the Y chromosome. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
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