1 Alleles Different forms of Genes for a single trait.
2 Dominant Gene that is always expressed.
3 Recessive Gene that is expressed only in the Homozygous state.
4 Heterozygous Genotypes made of two different alleles.
5 Homozygous Genotypes made of the same alleles.
Dominant Alleles X, Y
Recessive Alleles x, x
Homozygous Dominant XX, YY.
Homozygous Recessive xx, yy.
Genotypes in which Dominant Gene must show XX, Xx, YY, Yy
Genotypes in which Recessive Gene must show xx, yy
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