CC DD and cc dd individuals were crossed to eachother, and the F1 generation was backcrossed to thecc dd parent. 997 Cc Dd, 999 cc dd, 1 Cc dd, and 3 ccDd offspring resulted.a. How far apart are the c and d loci?b. What progeny and in what frequencies would youexpect to result from testcrossing the F1 generationfrom a CC dd × cc DD cross to cc dd?c. In a typical meiosis, how many crossovers occurbetween genes C and D?d. Assume that the C and D loci are on the samechromosome, but the offspring from the testcrossdescribed in part (b) were 498 Cc Dd, 502 cc dd,504 Cc dd, and 496 cc Dd. How would your answer to part (c) change?

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
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CC DD and cc dd individuals were crossed to each
other, and the F1 generation was backcrossed to the
cc dd parent. 997 Cc Dd, 999 cc dd, 1 Cc dd, and 3 cc
Dd offspring resulted.
a. How far apart are the c and d loci?
b. What progeny and in what frequencies would you
expect to result from testcrossing the F1 generation
from a CC dd × cc DD cross to cc dd?
c. In a typical meiosis, how many crossovers occur
between genes C and D?
d. Assume that the C and D loci are on the same
chromosome, but the offspring from the testcross
described in part (b) were 498 Cc Dd, 502 cc dd,
504 Cc dd, and 496 cc Dd. How would your answer to part (c) change?

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