recessive allele

the version of a gene (see allele) whose effects are manifest only if it is carried on both members of a homologous pair of chromosomes. Hence, the trait determined by a recessive allele (the recessive trait) is apparent only in the absence of another version of that same gene (the dominant allele). The term autosomal recessive is used to describe patterns of inheritance in which characteristics are conveyed by recessive alleles. For example, Tay–Sachs disease is an autosomal recessive disorder.

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Psychology term of the day

December 30th 2024

neurofibril

n. a fine fiber found in the cytoplasm of a neuron. It is composed of microscopic protein filaments and microtubules. Abnormal formation of neurofibrils leads to the development of neurofibrillary tangles, which are characteristic of Alzheimer’s disease. Also called neural fibril.