DIHYBRID PUNNETT SQUARE PRACTICE PROBLEMS
Problem A: Suppose that black hair (B) is dominant over blonde hair (b) and brown
eyes (E) are dominant over blue eyes (e).
The father has black hair (heterozygous) and brown eyes (heterozygous) and the
mother has blonde hair and blue eyes.
Genotype of father – BbEe Genotype of mother - bbee
1. What percent of the offspring will be totally heterozygous?
2. What is the phenotype ratio?
3. What percent of the offspring will have blonde hair and blue eyes?
Problem B: Using the same traits as above, cross a completely recessive person
with a blonde hair and homozygous brown eyed person.
1. What percent of the offspring will be totally heterozygous?
2. What is the phenotype ratio?
3. What percent of the offspring will have blonde hair and blue eyes?
