Dominant vs. recessive alleles

In eyesight, which eye colour is dominant?

• Hazel

• Blue

• Green

• Brown

Which one of these genotypes is homozygous dominant?

• BB

• Bb

• bb

A dominant allele is expressed (visible) only if ...

• There are zero dominant alleles

• There is one dominant allele

• There are two dominant alleles

• There is at least one dominant allele

Which one of these genotypes is homozygous recessive?

• BB

• Bb

• bb

In eyesight, which eye colour is recessive?

• Hazel

• Blue

• Green

• Brown

Which one of these genotypes is heterozygous?

• BB

• Bb

• bb

A recessive allele is expressed (visible) only if ...

• There are zero recessive alleles

• There is one recessive allele

• There are two recessive alleles

• There is at least one recessive allele

Which one(s) of these genotypes will display a dominant phenotype?

• BB

• Bb

• bb

Which one of these genotypes will display a recessive phenotype?

• BB

• Bb

• bb