dominant allele

the version of a gene (see allele) whose effects are manifest in preference to another version of the same gene (the recessive allele) when both are present in the same cell. Hence, the trait determined by a dominant allele (the dominant trait) is apparent even when the allele is carried on only one of a pair of homologous chromosomes. The term autosomal dominant is used to describe this pattern; for example, Huntington’s disease is an autosomal dominant disorder.

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Psychology term of the day

December 18th 2024

projection neuron

a neuron with a long axon extending some distance from the cell body. Also called Golgi Type I neuron. Compare local circuit neuron.