Answered: Mutation Trisomic chromosome d y h cot…

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter3: The Cellular Level Of Organization

Section: Chapter Questions

Problem 24RQ: Which of the following phases is characterized by preparation for DNA synthesis? G0 G1 G2 S

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A tomato geneticist attempts to assign five recessive
mutations to specific chromosomes by using trisomics.
She crosses each homozygous mutant (2n) with each of
three trisomics, in which chromosomes 1, 7, and 10 take
part. From these crosses, the geneticist selects trisomic
progeny (which are less vigorous) and backcrosses them
to the appropriate homozygous recessive. The diploid
progeny from these crosses are examined. Her results, in
which the ratios are wild type:mutant, are as follows:Which of the mutations can the geneticist assign to
which chromosomes? (Explain your answer fully.)

Mutation
Trisomic
chromosome
d
y
h
cot
48:55
72:29 56:50 53:54 32:28
7
52:56
52:48
52:51 58:56 81:40
10
45:42 36:33 28:32 96:50 20:17

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ISBN:

9781938168130

Author:

Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:

OpenStax College