Monohybrid cross.

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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