Co-Dominance and Incomplete Dominance in Genetics

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13 Terms

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Complete Dominance

A genetic relationship where only the dominant allele is expressed in the phenotype, masking the effect of any recessive allele.

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Homozygous

Individuals with two identical alleles for a trait (e.g., AA or aa).

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Heterozygous

Individuals with two different alleles for a trait (e.g., Aa).

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Phenotypic Expression

The phenomenon where the same phenotype can result from different genotypes.

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Co-Dominance

A genetic situation where the heterozygous phenotype displays traits from both alleles distinctly.

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Example of Co-Dominance

The AB blood type in humans, where both A and B alleles are expressed equally.

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Incomplete Dominance

A type of inheritance where the heterozygous phenotype is a blend of both alleles.

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Example of Incomplete Dominance

Crossing a red flower (RR) with a white flower (WW) produces pink flowers (RW).

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Diversity of Alleles

The presence of multiple alleles for a gene in a population, leading to genetic variation.

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Mendelian Genetics

Genetic principles established by Gregor Mendel that can predict outcomes of genetic crosses.

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Thomas Hunt Morgan's Contributions

Morgan used fruit flies to study inheritance patterns and discovered sex-linked traits.

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Wild Type

The most common phenotype in a population as studied by Morgan.

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Mutant Traits

Variations in phenotypes that differ from the wild type, providing insight into genetic mutations.