3. Linkage relations of duplicate genes pg₁₁ and pg₁₂ which give a pale green phenotype.

The pg₁₁ locus is between Y and Pl in chromosome 6 while pg₁₂ falls to the right of wx in the long arm of chromosome 9.

F2 data from self‑pollination of	Y Pg11	Sh Wx Pg12
	y pg11	sh wx pg12

The Y locus in chromosome 6 is independent of the Sh and Wx loci in chromosome 9 but Y, Sh and Wx all show linkage with the pale green character since it is due to duplicate genes, one of them being in chromosome 6 and the second in chromosome 9.

Y

Y

Y

Y

Y

Y

Y

Y

y

y

y

y

y

y

y

y

Sh

Sh

sh

sh

Sh

Sh

sh

sh

sh

Sh

sh

sh

Sh

Sh

sh

sh

Wx

Wx

Wx

Wx

wx

wx

wx

wx

Wx

Wx

Wx

Wx

wx

wx

wx

wx

Pg

pg

Pg

pg

Pg

pg

Pg

pg

Pg

pg

Pg

pg

Pg

pg

Pg

pg

810

6

119

0

87

13

123

17

252

7

30

2

17

18

23

28

Total 1552

Y‑ Pg11	= 22% recombination
Sh‑ Pg12	= 25% recombination
Sh‑ Wx	= 22% recombination
Wx‑ Pg12	= 7% recombination
Y‑ Sh	= 50% recombination
Y‑ Wx	= 48% recombination
linear order is Sh‑Wx‑Pg12

M.M. Rhoades