Biology
Biology
10th Edition
ISBN: 9780321794260
Author: Audesirk, Teresa/ Audesirk
Publisher: Pearson College Div
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Chapter 26, Problem 4RQ
Summary Introduction

To explain:

The term environmental resistance and also distinguish between the density independent and density dependent forms of environmental resistance. And also describe three example of each.

Introduction:

Growth curve represents the population growth with each period of time. Growth curve can be demonstrated by two types of growth curve: J shaped growth curves and sigmoid growth curve. The J shaped growth curves represent the unrestricted or exponential population growth while sigmoid growth curve represents the slow or restricted growth of population. The optimum carrying capacity can be defined as the capacity of an environment to support the biological species up to a level of availability of sustainable resources.

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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 transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant 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 parental cross. 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…
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