LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 9781319145125
Author: Sadava
Publisher: MAC HIGHER
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Chapter 20.1, Problem 2R
Summary Introduction
To review:
The method by which the frequency of resistant bacteria is expected to change over time in populations of bacteria that were regularly exposed to an antibiotic drug, and the reason behind a warning that comes with an antibiotic prescribed to take the full course of treatment.
Introduction:
Antibiotics are generally referred to as drugs capable of killing most of the bacteria. In some cases, bacteria undergo genetic mutations when they are exposed to antibiotics for short time and thereby, become resistant to the antibiotics so as to ensure their own or progenies’ survival upon future exposures to sustain the microbial population.
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The shape of radishes may be long (SL/SL), oval (SL/SS), or round (SS/SS), and the color of radishes may be red (CR/CR), purple (CR/CW) or white (CW/CW). If a long, red radish plant is crossed with a round, white plant, what will be the appearance of the F1 and F2 generations?
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Question #3:
In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would
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apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
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b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the…
Chapter 20 Solutions
LIFE: THE SCIENCE OF BIOLOGY
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