Ch.24 - Evolution of PopulationsWorksheetSee all chapters
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Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology

Solution: In cats, the Xb allele causes orange coat color and the XB allele causes black coat color. The alleles are X-linked and codominant, so heterozygotes are calico. Assume that a population offeral cats i

Problem

In cats, the Xb allele causes orange coat color and the XB allele causes black coat color. The alleles are X-linked and codominant, so heterozygotes are calico. Assume that a population offeral cats is in Hardy-Weinberg equilibrium, 70% of male cats in the population are black and 9% of female cats are orange. The frequency of the XB allele is _____ and we expect _____ offemale cats to be calico.

A. 49%; 42%

B. 70%; 42%

C. 30%; 42%

D. 70%; 49%

E. 49%; 30%

Solution

In a Hardy-Weinberg equilibrium, the population maintains a constant frequency for the alleles, and the genotypes of the gene in question. In the given problem, 70% of male cats in the population are black and 9% of female cats are orange. Male cats only have one X chromosome, thus, would not have calico coat color, Allele frequencies, therefore, would be equivalent to their genotypic frequencies: 0.7 XB and 0.3 Xb

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