In the land of Salad, there are two autosomal genes that (separately) determine

Question

In the land of Salad, there are two autosomal genes that (separately) determine two uniquephenotypes:

(i) Romaine lover (wild-type), Iceberg lover (recessive);

(ii) Thousand Island dressing lover (wild-type), Balsamic Vinaigrette lover (recessive).

We use the follow abbreviations for phenotypes:

Ro = Romaine Lover;

Ice = Iceberg Lover;

TI = Thousand Island Lover;

Ba = Balsamic Lover.

Two true-breeding parents, one who is a Iceberg and Balsamic lover, and the other who isRomaine, Thousand Island lover, are mated. One of the F1 offspring is back-crossed to a Iceberg, Balsamic lover. If the observed counts of each phenotype from 500 F2 offspring is

Ice/Ba Ro/TI Ice/TI Ro/Ba

240 240 10 10

the estimated recombination fraction between the 2 genes = 20/500 = 0.04

The recombination count is 20 and total is 500. Hence the above calculation.

Can some one please help validate my answer?

Explanation / Answer

Of 500 offspring

20 crossover events were observed among the 500 offspring

1cM = 1% recombination therefore

recombination frequency of 20 / 500 translates into a linkage distance of 4 cM.

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