What is the expected proportion of progeny with recombinant

What is the expected proportion of progeny with recombinant genotypes at the C and E genes from a female who has the following karyotypes (the genetic distance between all adjacent loci is 10cM):

a) A-B-C-D-E/a-b-c-d-e

b) A-E-D-C-B/a-b-c-d-e

c) A-E-D-C-B/a-e-d-c-b

Solution

If the combination is said to occur between C & E, following are the possibility of progenies:

a.)

i) If recombination occurs between C and D Progeny will be: ABCde/abcDE

ii) If it occures between d and e : Result will be ABCDe/abcdE

b.)

i) Recombination between E and D result will be: AEdcb/aBCDe

ii) Recombination of c and d will form AEDcb/aBCde

c.)

i) Recombination between E and D will result will be: AEdcb/aeDCB

ii) Recombination between c and d will form AEDcb/aedCB