24 . In drosophila, a purebreeding mutant fly with the recessive double leg trai

Question

24. In drosophila, a purebreeding mutant fly with the recessive double leg trait (d/d) is hybridized to a mutant fly with the recessive tan body trait (t/t). What would you cross the hybrid progeny (F1 generation) with to detect linkage / recombination?
(a) A purebreeding wildtype fly

(b) A fly with double leg

(c) A fly with a tan body

(d) a heterozygous fly for both traits

(e) a fly with double leg and tan body

KEY FOR 24 E

25. From the previous questions. Which of the following would be a parental phenotype from the cross? (mark all that apply)

(a) Wildtype fly
(b) Double leg fly
(c) Tan fly
(d) Double leg and tan fly

(e) None of the above

KEY 25 IS B AND C

Explanation / Answer

24)-E is correct because to determine the linkage/recombination test cross has to be done. And linkage will be detected if there are more testcross progeny who got the parental gametes from the dominant individual that you would expect by chance alone.

25- B and C are true because the cross goes like this

ddTT x DDtt

DdTt (F1 progeny)

Test cross of F1

DdTt x ddtt

From the crosses the we can determine the parental phenotypes to be double leg fly and tan fly.

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