Campbell Biology
Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 23.4, Problem 3CC
Summary Introduction

To compare and explain: The description of the selection models shown in Figure 23.13 where a population with heterozygotes at a certain locus has an extreme phenotype that confers a selective advantage.

Concept introduction:

Natural selection favors the selective phenotypes by altering the heritable traits frequency through directional selection, disruptive selection, and stabilizing selection.

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Figure is attached Please consider sexual selection operating on red-collared widowbirds assess the lowercase-Roman-numeral-labelled statements that appear immediately below; and click the uppercase-letter-labelled response that is presented below and conveys the most accurate information. i. The specimen depicted at the top in the figure represents the group in which individuals were manipulated experimentally, trimmed so that tail lengths were shortened substantially.ii. The specimen depicted at the bottom in the figure represents the group in which individuals were unmanipulated, left untrimmed.iii. Individuals in the group represented by the specimen at the bottom fared better in condition (measured as body mass relative to length) terms than did individuals in the group represented by the specimen at the top. iv. Individuals in the group represented by the specimen at the bottom spent more time flying and displaying to potential mates than did individuals in the group represented…
atural Selection - DA # 3 Flgure A shows the color of deer mice (Peromyscus maniculatus) In the Nebraska Sand Hills (white area) and the rest of the State (grey area). Mice are shown on the habitat they are not nomally found on. The color of the Sand Hills Is shown below the light-colored mouse (normal habltat), while the color of the ground in the rest of the State is shown below the dark-colored mouse. Figure B shows the phenotyplc difference in the hair shaft of the wild-type and the light-colored (wideband) mice. Figure C shows the expressilon levels (MRNA) of the Agouti alleles responsīble for the phenotype seen in figure B. a+= wild-type Agouti alele, a-= a deletion of the Agouti allele, awb = wideband Agouti allele mutation, and the black rectangles undermeath each bar is the relative difference in the hair shaft band phenotype. Wder band means lighter hair color in the deer mice. b. The Sand Hills were created by volcanic activity 15,000-8,000 years ago. How were the deer mice…
rolution on.com/player Stages of natural selection What is the order of stages in natural selection? Genetic variation exists between individuals of a population. Individuals compete with each other for food, water and mates, and to avoid predators. Individuals with adaptive phenotypes compete better and are more likely to survive and reproduce, at the expense of... ..individuals with less adaptive phenotypes and fewer competitive characteristics, which die or reproduce less. Genes for adaptive char acteristics are more likely to be inherited. The number of individuals with the adaptive phenotype increases. oboardworks 18 of 29 Chp
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