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Gene Linkage and Mapping – Practice
Name:_______________________
Gene Mapping Questions
1. The crossover frequency between genes E and F is 6%, between E and G is 10% and
between F and G is 4%. Construct a gene map. Determine the sequence of genes on the
chromosome.
2. In 1911, Thomas Morgan collected the following crossover gene frequencies while
studying Drosophila. Bar-shaped eyes are indicated by the B allele, and carnation eyes
are indicated by the allele C. Fused veins on wings (FV) and scalloped wings (S) are also
located on the same chromosome.
Gene Combinations
FV/B
FV/C
B/C
B/S
FV/S
C/S
Frequencies of Recombinations
2.5%
3.0%
5.5%
5.5%
8.0%
11.0%
Construct a gene map. Determine the sequence of genes on the chromosome.
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