Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 3TYU
If the
- A. gene variability =0%; number of alleles = 0
- B. gene variability = 0%; number of alleles = 1
- C. gene variability = 0%: number of alleles = 2
- D. gene variability > 0%; number of alleles = 2
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Students have asked these similar questions
Answer the following questions:
a. A gene has 2 alleles, R and B. List the possible genotypes.
b. If there are 40 individuals in a population and all 40 have the
genotype RB, what is the frequency of the R allele?
c. If there are 40 individuals in a population and 10 are RR, 20
are RB, and 10 BB, what is the frequency of the R allele?
d. If there are 40 individuals in a population and 10 are RR, 10
are RB, and 20
BB, what is the frequency of the R allele?
If 120 of 200 alleles are dominant alleles, then what percentage of the alleles are dominant alleles?
A-12%
B-40%
C-60%
D-120%
What percentage of the alleles are recessive alleles?
E-8%
F-40%
G-60%
H-80%
Which of the terms of the Hardy-Weinberg equations represents the frequency of the recessive allele in the gene pool?
A-p^2
B-p
C-2pq
D-q^2
If both parents are recessive short, what is the phenotype in percentage (%) for the possible offspring? Use the reference sheet below to answer.
Chapter 21 Solutions
Campbell Biology in Focus
Ch. 21.1 - Explain why genetic variation within a population...Ch. 21.1 - Of all the mutations that occur in a population,...Ch. 21.1 - Prob. 3CCCh. 21.2 - A population has 700 individuals, 85 of genotype...Ch. 21.2 - The frequency of allele a is 0.45 for a population...Ch. 21.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 21.3 - In what sense is natural selection more...Ch. 21.3 - Distinguish genetic drift from gene flow in terms...Ch. 21.3 - WHAT IF? Suppose two plant populations exchange...Ch. 21.4 - What is the relative fitness of a sterile mule?...
Ch. 21.4 - Explain why natural selection is the only...Ch. 21.4 - Consider a population in which heterozygotes at a...Ch. 21 - Natural selection changes allele frequencies...Ch. 21 - Sparrows With average-sized w1ngs survive severe...Ch. 21 - If the nucleotide variability of a locus equals...Ch. 21 - There are 25 individuals in population 1, all with...Ch. 21 - A fruit fly population has a gene with two...Ch. 21 - FOCUS ON EVOLUTION Using at least TWO examples,...Ch. 21 - Prob. 8TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE This kettle lake formed...
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- The graph below shows values for body size in parents and offspring. The data shown are consistent with which of the following situations. ANSWER CHOICES A. variation in body size is completely due to variation in the environment (heritability is 0) B. most of the variation in body size is due to variation in the environment but there is a small effect of genes (heritability is around 0.2) C. variation in body size is completely due to variation in genes (heritability is 1.0) D. most of the variation in body size is due to variation in genes but there is some effect of the environment (heritability is about 0.8)arrow_forwardIf both parents are dominant tall, what is the genotype in percentage (%) for the possible offspring? Use the reference sheet below to answer.arrow_forwardIn fruit flies, long wings (L) are dominant over short wings (l). In a population of 45 fruit flies, 27 have LL genotypes, 13 have Ll genotypes, and 5 have ll genotypes. Find the frequency of the following. Show all work and record your answer as a value between 0 and 1 rounded to two decimal places.a. long-winged fruit flies: b. short-winged fruit flies:arrow_forward
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- If the nucleotide variability of a locus equals 0%, what is thegene variability and number of alleles at that locus?(A) gene variability = 0%; number of alleles = 0(B) gene variability = 0%; number of alleles = 1(C) gene variability = 0%; number of alleles = 2(D) gene variability 7 0%; number of alleles = 2arrow_forwardSkin pattern in a new frog species is controlled by three alleles of the same gene. Two alleles, Green Spots and White Stripes, are codominant and are both recessive to Black. Which of the choices below includes ALL the phenotypes expected to exist in the frog population in the wild ? A. White Stripes, Green Spots, White Stripes and Green spots B. Green Stripes, White Spots and uniform Black C. Green spots, White Stripes, Green Spots and White Stripes, Uniform black D. Uniform Black, Black spots, White Stripes, Green Stripes and White spots E. White Stripes, Green Spots, Black Stripes, Black Spots, Green spots & white stripesarrow_forwardA scientist is studying a wild population of Japanese morning glories. It is easy to separate genotypes at a flower color locus by their phenotypes. Red individuals are homozygous for the R allele, yellow individuals are homozygous for the Y allele, and orange individuals are heterozygous. If the number of individuals with the following genotypes are: RR: 831 RY: 33 YY: 442 Is the population in Hardy Weinberg Equilibrium?arrow_forward
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