Dominant Allele: allele that is always expressed in the phenotype.
Recessive Allele: allele that is expressed in the phenotype in the absence of a dominant allele.
Codominance: both alleles are dominant and are expressed in the phenotype.
Genotype: constitution of an organism comprising all the genes possessed by an individual.
Phenotype: characteristics of an organism, often visible, resulting from the genotype and the effects of the environment.
Heterozygous: having two different alleles for a given gene.
Homozygous: having two dominant/recessive alleles present for a given gene.
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