Progeny of F,x any b r/br Cross F1 B R/BR (Calif.) x b r/b r (Calif.) BR/br BR/br 36% br/br 36 Br/br 14 b R/br 14 B R/B R (Chile) B R/br BR/br 36 x b r/b r (Chile) br/br 36 Br/br 14 b R/br 14 B R/BR (Calif.) x b r/b r (Chile) or br/br (Calif.) x BR/B R (Chile) BR/br BR/br 48 br/br 48 Br/br 2 b R/br 2 a. Provide a genetic hypothesis that explains the three sets of testcross results. b. Draw the key chromosomal features of meiosis in the F, from a cross of the Californian and Chilean lines.
Progeny of F,x any b r/br Cross F1 B R/BR (Calif.) x b r/b r (Calif.) BR/br BR/br 36% br/br 36 Br/br 14 b R/br 14 B R/B R (Chile) B R/br BR/br 36 x b r/b r (Chile) br/br 36 Br/br 14 b R/br 14 B R/BR (Calif.) x b r/b r (Chile) or br/br (Calif.) x BR/B R (Chile) BR/br BR/br 48 br/br 48 Br/br 2 b R/br 2 a. Provide a genetic hypothesis that explains the three sets of testcross results. b. Draw the key chromosomal features of meiosis in the F, from a cross of the Californian and Chilean lines.
Chapter2: Where, Why, And What
Section: Chapter Questions
Problem 1M
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Two groups of geneticists, in California and in Chile, begin work to develop a linkage map of the medfly. They
both independently find that the loci for body color
(B = black, b = gray) and eye shape (R = round, r =
star) are linked 28 m.u. apart. They send strains to each
other and perform crosses; a summary of all their findings is shown here:a. Provide a genetic hypothesis that explains the three
sets of testcross results.
b. Draw the key chromosomal features of meiosis in the
F1 from a cross of the Californian and Chilean lines.
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