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recessive trait

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recessive trait

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About recessive trait

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. The masking or overriding variant is said to be dominant and the other recessive. This state of having two different variants of the same gene, one on each copy of the chromosome, is originally caused by a mutation in one of the genes, either new or inherited. The terms autosomal dominant and 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. Since there is only one Y chromosome, Y-linked traits cannot be dominant or 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.

Facts from Wikidata (CC0). Image by Kuebi = Armin Kübelbeck via Wikimedia Commons (CC BY-SA 3.0).

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