Question

19. R. W. Allard and W. M. Clement determined recombi- ADATA nation rates for a series of genes in lima beans (R. W. Allard and W. M. Clement. 1959. Journal of Heredity 50:63–67). The following table lists paired recombina- tion frequencies for eight of the loci (D, WI, R, S, L, Ms, C, and G) that they mapped. On the basis of these data, draw a series of genetic maps for the different linkage groups of the genes, indicating the distances between

Answer 1

The question is solved on the basis of recombination frequency. Two genes are linked only when there is found recombiantion frequency of less than 50%. And if there is found recombination frequency of more than 50% , then this two genes are not linked.

And it is also given that asterik denotes that there is significant difference occurs fom 50% is found.

Now look in the image :

C ... Ms G 212 38 14.7 Linkage linkage group ! Linkage group 2 group 3 Linkage group -

There are found 4 linkage groups :

Linkage group 1 contains:D--Wl---R1

Linkage group 2 contains: L1--- S

Linkage group 3 contains: C---- Ms

Linkage group 4 contains: G