In a haploid organism the C and D loci are 8 mu apart From a

In a haploid organism, the C and D loci are 8 m.u. apart. From a cross C d × c D, give the proportion of each of the following progeny classes:

(a) C D

(b) c d

(c) C d

(d) all recombinants.

Solution

Here, the distance is just 8cM, which is a very close distance for the recombination, but it is more than 0, i.e., no recombination. The maximum probability for recombination that can occur is 50%, only with 50cM as the measurable distance
1cM = 1%
8cM= 8% recombination on the map.
Since there can be 4 genotypes:
1) C D- 42% probability
2) c d- 42% probability
3) c D- 8%
4) C d - 8%