Three recessive genes in a linkage group of the tomato are \"a\" producing the t

Question

Three recessive genes in a linkage group of the tomato are "a" producing the the
absence of anthocyanin pigment, "h1" producing hairless plants, and "j" producing
jointless fruit stems. Among 3000 progeny from a trihybrid testcross, the following
phenotypes were observed :
259 hairless
40 jointless, hairless
931 jointless
260 normal
268 anthocyaninless, jointless, hairless
941 anthocyaninless, hairless
32 anthocyaninless
269 anthocyaninless, jointless
a. How were these genes originaly linked in the trihybrid parent?
b. Estimate the distances between the genes?

Explanation / Answer

If joint less is in middel--------------no double cross over

If A is in middel------------- double cross over CAN BE OBTAINED

Jhla/Jhia

double cross over ----------JHIa---------aniohocyaninless ; jhlA-----JOINT LESS ,HAIRLESS

a. How were these genes originaly linked in the trihybrid parent?

PARENT------------------ Jhla/Jhia

b. Estimate the distances between the genes?

260+268+32+40 =600/3000=1/5= 0.2= 20%

Map distance--- 20 map units

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