Mendelian Genetics - Complete Dominance

Which of the following is a phenotype?

• R

• Rr

• red flower

Brown eyes are dominant to blue. Which parental cross would result in ~50% blue eyes in the offspring?

• BB x bb

• Bb x Bb

• BB x Bb

• Bb x bb

Which genotype is homozygous recessive?

• nn

• Nn

• NN

Which of the following is a phenotype?

• curly hair

• Cc

• C

If both parents are heterozygous for a trait, what percent of the offsriping would you expect to be homozygous recessive?

• 75%

• 50%

• 25%

• 0%

Which genotype is heterozygous?

• A

• AA

• Aa

• aa

If both parents are heterozygous for a trait, what is the phenotypic ratio of the offspring?

• 1 : 2 : 1

• 4 : 0

• 2 : 2

• 3 : 1

Which genotype is homozygous?

• Tt

• tt

• t

• T

If a parent is homozygous dominant for a trait, what percent of the offspring would you expect to have the dominant trait?

• 100%

• 75%

• 50%

• 25%

If both parents are heterozygous for a trait, what is the genotypic ratio of the offspring?

• 1 : 2 : 1

• 4 : 0

• 2 : 2

• 3 : 1