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Crossing two sex linked traits

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Sex-linked diseases are passed down through families through one of the X or Y chromosomes. X and Y are sex chromosomes. Dominant inheritance occurs when an abnormal gene from one parent causes disease, even though the matching gene from the other parent is normal. The abnormal gene dominates. But in recessive inheritance, both matching genes must be abnormal to cause disease.

Sex- linked Information

Sex-linked dominant: MedlinePlus Medical Encyclopedia

In genetics , dominance is the phenomenon of one variant allele of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome. This state of having two different variants of the same gene on each chromosome is originally caused by a mutation in one of the genes, either new de novo or inherited. The terms autosomal dominant or autosomal recessive are used to describe gene variants on non-sex chromosomes autosomes and their associated traits, while those on sex chromosomes allosomes are termed X-linked dominant , X-linked recessive or Y-linked ; these have an inheritance and presentation pattern that depends on the sex of both the parent and the child see Sex linkage. Since there is only one copy of the Y chromosome , Y-linked traits cannot be dominant nor recessive. Additionally, there are other forms of dominance such as incomplete dominance , in which a gene variant has a partial effect compared to when it is present on both chromosomes, and co-dominance , in which different variants on each chromosome both show their associated traits. Dominance is not inherent to an allele or its traits phenotype.

Sex linkage

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However, he only was able to describe simple or complete dominance patterns in individuals based on what he observed with those plants. There are many other ways that genes are inherited other than what Mendel described in his research findings. Incomplete dominance can affect evolution when the blending of two traits becomes a desirable characteristic.
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