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all of the moths of the same species living in an isolated forest are a population. A gene in this population may have several alternate forms, which account for variations between the phenotypes of the organisms. An example might be a gene for coloration in moths that has two alleles: black and white. A gene pool is the complete set of alleles for a gene in a single population; the allele frequency for an allele is the fraction of the genes in the pool that is composed of that allele (for example, what fraction of moth coloration genes are the black allele). Evolution occurs when there are changes in the frequencies of alleles within a population; for example, the allele for black color in a population of moths becoming more common.
Biston betularia f. typica is the white-bodied form of the peppered moth.
Biston betularia f. carbonaria is the black-bodied form of the peppered moth.
Examples of incomplete dominance are:
- A snapdragon flower that is pink as a result of cross-pollination between a red flower and a white flower when neither the white or the red alleles are dominant.
- A brown fur coat on a rabbit as a result of one rabbit's red allele and one rabbit's white allele not dominating.
- A child with wavy hair as a result of one parent's curly hair and the other's straight hair.
- An Andalusian foul produced from a black and a white parent is blue.
- A carnation that is pink that is a result of cross-pollination between a red carnation and a white carnation.
- A black sheep and a white sheep mate and have a grey sheep.
- A black dog and a brown dog mate and the result is a dog with a brindle coat.
- A white cat and a brown cat mate and the result is an orange cat.
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