Biology

When one parent is heterozygous (e.g., Aa) and the other is homozygous recessive (aa), the possible genotypes of the offspring are Aa and aa in a 1:1 ratio.

If both parents were homozygous dominant (AA x AA), all offspring would be homozygous dominant with a single phenotype.

If both were homozygous recessive (aa x aa), all offspring would be homozy...