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Not actually allelic properties
fabian-daugherty.blogspot.com
- In fact, dominance and recessiveness are not actually allelic properties. Rather, they are effects that can only be measured in relation to the effects of other alleles at the same locus. Furthermore, dominance may change according to the level of organization of the phenotype.
www.nature.com/scitable/topicpage/genetic-dominance-genotype-phenotype-relationships-489/
Although most gain-of-function alleles contribute to dominant phenotypes, and most loss-of-function alleles contribute to recessive phenotypes, there are exceptions. Haploinsufficient genes are one example.
Indeed, "codominance" is the specific term for a system in which an allele from each homozygote parent combines in the offspring, and the offspring simultaneously demonstrates both phenotypes....
Jun 20, 2023 · Thus, the allele associated with purple color is therefore said to be dominant to the allele that produces the white color. The white allele, whose phenotype is masked by the purple allele in a heterozygote, is recessive to the purple allele.
Sep 17, 2023 · Rather than both alleles contributing to a phenotype, the dominant allele will be expressed exclusively. The recessive allele will remain latent, but will be transmitted to offspring in the same manner as that by which the dominant allele is transmitted.
Nov 29, 2023 · Alleles determine whether a phenotype, or physical trait, is dominant or recessive. A dominant allele is expressed even if only one copy is present, while a recessive allele requires two copies (homozygous) for expression.
An individual with one dominant and one recessive allele for a gene will have the dominant phenotype. They are generally considered “carriers” of the recessive allele: the recessive allele is there, but the recessive phenotype is not.
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Alleles do not always behave in dominant and recessive patterns. Incomplete dominance describes situations in which the heterozygote exhibits a phenotype that is intermediate between the homozygous phenotypes.
