Recombination Remediation Name: _________________________
1. A wild-type fruit fly (heterozygous for gray body color and normal
wings) is mated with a black fly with vestigial wings. The offspring have
the following phenotypic distribution:
Gray body and normal wings: 778
Black body and vestigial wings: 785
Black body and normal wings: 158
Gray body and vestigial wings: 162
Recombination Remediation Name: _________________________
1. A wild-type fruit fly (heterozygous for gray body color and normal
wings) is mated with a black fly with vestigial wings. The offspring have
the following phenotypic distribution:
Gray body and normal wings: 778
Black body and vestigial wings: 785
Black body and normal wings: 158
Gray body and vestigial wings: 162
a. Write the genotypes of the parents.
a. Write the genotypes of the parents.
b. List the parental phenotypes of the offspring:
b. List the parental phenotypes of the offspring:
c.
c.
List the recombinant phenotypes of the offspring:
List the recombinant phenotypes of the offspring:
d. What is the recombination frequency between the genes for body
color and wing size? Show your work.
d. What is the recombination frequency between the genes for body
color and wing size? Show your work.
e. What genetic process led to the recombinant phenotypes?
e. What genetic process led to the recombinant phenotypes?
f.
f.
Are they on the same chromosome (Y or N)? How can you tell?
Are they on the same chromosome (Y or N)? How can you tell?
g. Make a drawing of the chromosomes of a fly that is heterozygous
for both traits. Label the alleles on the chromosomes.
g. Make a drawing of the chromosomes of a fly that is heterozygous
for both traits. Label the alleles on the chromosomes.
2. The recombination frequencies for 4 genes (A – D) were determined.
They are as follows:
(A – B: 8%) (A – C: 28%) (A – D: 25%) (B – C: 20%) (B – D: 33%)
2. The recombination frequencies for 4 genes (A – D) were determined.
They are as follows:
(A – B: 8%) (A – C: 28%) (A – D: 25%) (B – C: 20%) (B – D: 33%)
a. Determine the sequence of these genes along a chromosome.
a. Determine the sequence of these genes along a chromosome.