Answered: F2 Parents True-Breeding…

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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Question

For all seven characters described in the data of
Mendel allowed the F2 plants to self-fertilize. He found that when
F2 plants with recessive traits were crossed to each other, they
always bred true. However, when F2 plants with dominant traits
were crossed, some bred true but others did not. A summary of
Mendel’s results is shown to the right When considering the data in this table, keep in mind that they
describe the characteristics of the F2 generation parents that had
displayed a dominant phenotype. These data were deduced by
analyzing the outcome of the F3 generation. Based on Mendel’s
laws, explain why the ratios were approximately 1:2

F2 Parents
True-Breeding
Non-True-Breeding
Ratio
Round
193
372
1:1.9
Yellow
166
353
1:2.1
Gray
36
64
1:1.8
Smooth
29
71
1:2.4
Green
40
60
1:1.5
Axial
33
67
1:2.0
Tall
28
72
1:2.6
TOTAL:
525
1059
1:2.0

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