Cell Division and Heredity Worksheet
Monohybrid cross 1
Using the appropriate notation, and the Punnett square below, identify the phenotype
and genotype ratios of a cross between two parents that are heterozygous for
handedness.
Female
r
R
R Rr
Male RR
rr
r
Rr
Phenotype ratio = 3:1 right-handed to left-handed
Genotype ratio = 1(RR):2(Rr):1(rr) =1:2:1
Monohybrid cross 2
Using the appropriate notation, and the Punnett square below, identify the phenotype
and genotype ratios of a cross between a female with blood type AB (I AIB) and a
male whose genotype is IBIO
Female
|B
|A
|B |A|B |B|B
|B|O
Male |O |A|O
Phenotype ratio = 1:1:1:1(Type B=50% Type AO = 25% BO = 25%
Genotype ratio = 1:1:1:1(AB = 25% AO = 25% BO = 50%)
Sex linkage
Using the appropriate notation, and the Punnett square below, identify the phenotype
and genotype ratios of a cross between a colour blind male and a carrier female.
1
Monohybrid cross 1
Using the appropriate notation, and the Punnett square below, identify the phenotype
and genotype ratios of a cross between two parents that are heterozygous for
handedness.
Female
r
R
R Rr
Male RR
rr
r
Rr
Phenotype ratio = 3:1 right-handed to left-handed
Genotype ratio = 1(RR):2(Rr):1(rr) =1:2:1
Monohybrid cross 2
Using the appropriate notation, and the Punnett square below, identify the phenotype
and genotype ratios of a cross between a female with blood type AB (I AIB) and a
male whose genotype is IBIO
Female
|B
|A
|B |A|B |B|B
|B|O
Male |O |A|O
Phenotype ratio = 1:1:1:1(Type B=50% Type AO = 25% BO = 25%
Genotype ratio = 1:1:1:1(AB = 25% AO = 25% BO = 50%)
Sex linkage
Using the appropriate notation, and the Punnett square below, identify the phenotype
and genotype ratios of a cross between a colour blind male and a carrier female.
1
