Presence of many alleles for the trait to be expressed - Multiple
Presence of two alleles for the trait to be expressed - Recessive
Presence of a single allele for the trait to be expressed - Dominant
- Dominant alleles show their effect even if the individual only has one copy of the allele (also known as being heterozygous).
- Recessive alleles only show their effect if the individual has two copies of the allele (also known as being homozygous).
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