week 4-2 polls

​Thomas Hunt Morgan working with Drosophila crossed:
purple vestigial double mutant crossed to wild-type (pure lines)

Poll

From the dihybrid shown what % of the gametes will have the parental chromosome pr⁺ vg⁺?

• 11%

• 5.5%

• 22%

• 44.5%

• 89%

​Recombination between pr and vg is 11% or 11 m.u. . Therefore, the recombinant class should total 11 %.

​pr vg⁺ 5.5%
pr⁺ vg 5.5%

​Recombination between linked genes can be used to map their distance apart on a chromosome. The unit of mapping (1 m.u.) is defined as a recombinant frequency of 1 percent 1 m.u. aka 1 centiMorgan (cM)

​pr vg⁺ 5.5%
pr⁺ vg 5.5%

​pr vg 44.5%
pr⁺ vg⁺ 44.5%

​We know that 100-11 =89% will be non-recombinant (parental) in equal classes.