5. A kidneybean shaped eye is produced by a recessive gene, k, on the third chro

Question

5. A kidneybean shaped eye is produced by a recessive gene, k, on the third chromosome of Drosophila. Orange eye color, called cardinal, is produced by the recessive gene cd on the same chromosome. A third recessive gene on chromosome three, e, produces ebony body color. Trihybrid females are testcrossed to produce 4000 progeny, as follows: 1761 kidney, cardinal 1773 ebony 128 cardinal 97 kidney 89 ebony, cardinal 6 kidney, ebony, cardinal 8 wild type 138 kidney, ebony a. Which gene is in the middle? b. What is the distance between genes k and cd? c. What is the distance between genes e and k? d. What is the distance between genes cd and e?

Explanation / Answer

Recombinant frequency % of kidney bean shape =1761/4000x100=44%

RF% of Cardinal = 1773/4000x100=44.3%

RF% of Ebony = 128/4000x100=3.2%

RF% of cardinal = 97/4000x100=2.4%

RF% of Kidney = 89/4000x100=2.2%

RF% of Ebony, cardinal = 6/4000x100=0.15%

RF% of Kidney, ebony, cardinal= 8/4000x100=0.2%

RF% of Wild type Kidney, ebony = 138/4000x100=3.45%

----------------e----------cd------------------------k---------

                    e----------cd

                       0.15mu

                   cd ---------------------------k =c

                           3.3mu       

                   e---------------------------------------------k =d

                                             3.45mu

cardinal, cd, b is in middle

Distance between k and cd, c is 3.3map units

Distance between e and k, d is 3.45 map units

Distance between cd and e, is 0.15 map units

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