Discussion:
Gene linkage
The following cross involving three genes was performed: Aa Bb Cc x aa bb cc, and the phenotypes and number of progeny are shown below. Each pair of alleles exhibits simple dominance and recessiveness.
Progeny Phenotype Number of progeny
A B C 181
a b c 169
a B C 77
A b c 73
A B c 69
a b C 81
a B c 173
A b C 177
1000
Which pair of genes is clearly linked to each other, and which gene is clearly unlinked to the other two? What is the map distance between the two linked genes? HINT: Compare two genes at a time and check if they are linked or assort independently.