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Sex linked all three males recessive

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    X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be always expressed in males who are necessarily homozygous for the gene mutation because they have one X and one Y chromosome and in females who are homozygous for the gene mutation, see zygosity. Females with one copy of the mutated gene are carriers. X-linked inheritance means that the gene causing the trait or the disorder is located on the X chromosome. Females have two X chromosomes while males have one X and one Y chromosome.
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    X-linked recessive inheritance

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    X-linked recessive inheritance - Wikipedia

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    X-linked inheritance

    This page has been archived and is no longer updated. Knowledge about recessive X-linked gene-disease associations has led to the development and widespread use of prenatal diagnostic tests that can provide parents with information about whether their embryo or fetus might be carrying a disease mutation. Based on that information, the parents can either terminate the pregnancy or prepare for their future child, depending on their beliefs. You might expect that this kind of widespread testing has had the ultimate effect of decreasing the frequency of disease alleles in the population.
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    Sex Linked Genes. A particularly important category of genetic linkage has to do with the X and Y sex chromosomes. These not only carry the genes that determine male and female traits but also those for some other characteristics as well.
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