CAMPBELL MASTERING BIOLOGY ACCESS>I<
CAMPBELL MASTERING BIOLOGY ACCESS>I<
18th Edition
ISBN: 9781323766286
Author: Pearson
Publisher: PEARSON
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Chapter 21.4, Problem 3CC
Summary Introduction

To determine:

The type of natural selection (directional, disruptive or stabilizing) in situation where heterozygotes for a certain locus in a population have extreme phenotype that confers a selective advantage.

Introduction:

Natural selection is processes by which organisms are tend to adapt the environment and produce more offsprings of particular traits. Natural selection: are of 3 types (a) stabilizing selection; in which an average phenotype is favored, (b) directional selection; in which the change in the environment change the wide range of phenotypes, (c) diversifying selection; extreme values for a character is favored by natural selection.

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1.Describe the ways that gene number or gene position on a chromosome, might be altered? What implications might that have on evolution? 2.What are the conditions that must be met for a population to stay in Hardy-Weinberg equilibrium? What happens if these conditions are not met? 3.What type of selection would most likely benefit heterozygous individuals and which will result in a population losing alleles: directional, disruptive, or stabilizing? Explain. 4.How might frequency dependent selection and the heterozygote advantage help maintain multiple alleles in a population? 5.Describe the theory of evolution by natural selection. Include terms like "excess reproduction, genetically distinct offspring, changing allele frequencies, and adaptive traits".
Recall that the Hardy-Weinberg model makes the following assumptions: No mutations Extremely large population No gene flow No selection You score flower colour in a very large natural population where flower colour is a co-dominant trait where white and red are homozygotes (CWCW and CRCR) and pink are heterozygotes (CWCR). Taking your observed phenotypes and genotypes, you apply the Hardy-Weinberg principle and find an excess of homozygous individuals (that is, individuals with either white or red flowers). Give two plausible explanations for this excess of homozygotes in the natural population.
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