Answered: Progeny of F,x any b r/br Cross F1 B…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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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.

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.

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