Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Textbook Question
Chapter 26, Problem 9PDQ
If 4 percent of a population in equilibrium expresses a recessive trait, what is the probability that the offspring of two individuals who do not express the trait will express it?
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An F2 ratio of 12:3:1 is most characteristic of a genetic interaction involving?
1) two gene loci with two alleles per locus
2) three gene loci with two alleles per each gene
3) two alleles of the same gene
4) multiple alleles of one gene
Fur colour in mice is a single gene trait controlled by two alleles.
In a population of 100 mice, 30 are homozygous dominant, 50 are heterozygous dominant, and 20 are homozygous recessive. What is the frequency of the dominant allele in the population?
This lab exercise requires that we count certain Mendelian traits among students present in the lab. Your professor will explain each trait being addressed and will then ask students to identify if they are dominant or recessive for that specific trait. The collected traits will then be plugged into the Hardy-Weinberg Equilibrium formula in order to calculate frequency of Homozygous dominant, Heterozygous and Homozygous recessive individuals in the same.
p2 + 2pq + q2 = 100
given data:
trait: hair swirl
19 individuals total.
10 had the homozygous dominant hair swirl trait: clockwise
the nine other were recessive
please do a step by step explanation with the calculation using this data, as I am very unfamiliar with what values mean what and the equation itself
thank you!
Chapter 26 Solutions
Concepts of Genetics (12th Edition)
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- If 4 percent of a population in equilibrium expresses a recessivetrait, what is the probability that the offspring of two individualswho do not express the trait will express it?arrow_forwardIn corn, kernel color is governed by a dominant allele for white color (W) and by a recessive allele for yellow (w). A random sample of 152 kernels from a population that is in Hardy- Weinberg equilibrium reveals that 35 kernels are yellow and 117 kernels are white. What is the frequency of individuals with the homozygous dominant genotype?arrow_forwardIf 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^2arrow_forward
- In a certain breeding population, it is known for certain that only 9.8% of the individuals are "true-breeding" for the dominant phenotype. What would be the predicted frequency of individuals that are "true-breeding" for the recessive phenotype?arrow_forwardIn Hereford cattle, the phenotypic expression of coat pattern called line-back (a white line down the center of the back, extending almost to the tail) is considered undesirable. The gene which causes line-back is recessive and autosomal. If 7 cows out of 100 cattle express this trait, what is the allele frequency for this trait? If the line-back cows are not included in the mating population (W22=0), how many line-back cows will be found in the next generation? (Assume 100 cows in the next generation.) can u ansewer the second questionarrow_forwardIn a population at genetic equilibrium, the frequency of the dominant phenotype is 0.96. What are the frequencies of the dominant (A) and recessive (a) alleles, and what are the expected frequencies of the AA, Aa, and aa genotypes?arrow_forward
- Which of these definitions of heritability is most correct? a)The total amount of phenotypic variation in a population. b) The total amount of genetic variation in a population. c) The proportion of phenotypic variation in a population that is due to genetic factors. d) The proportion of phenotypic variation in a population that is due to environmental factors.arrow_forwardIn a population of 200 people, an allele F has a frequency of 84%. What is the frequency of allele f? Using the Hardy-Weinberg equation, estimate the numbers of homozygous dominant, heterozygous, and homozygous recessive genotypes. (Remember that the formula is: p2 + 2pq + q2 = 1, where p represents the dominant allele and q represents the recessive allele.) *Be sure to account for all 200 people in the population.arrow_forwardIn a system that meets the requirements for Hardy-Weinberg equilibrium 25% of individuals exhibit the recessive phenotype for a trait. What is the allele frequency of the dominant allele?arrow_forward
- In a certain breeding population , it is known for certain that only 7.8% of the individuals are "true breeding" for the dominant phenotype. What would be the predicted frequency of individuals that are "true-breeding" for the recessive phenotype?arrow_forwardThe ability to taste the compound PTC is controlled by a dominant allele T, while individuals homozygous for the recessive allele (t) cannot taste PTC. In a population consisting of 500 individuals, 347 are tasters and 153 are non-PTC tasters. Calculate the frequency of the T and t alleles in this population, and frequency of the genotypes. (Please train yourself to use the Hardy-Weinberg equation.)arrow_forwardThe ability to taste the compound PTC is controlled by a dominant allele T, while individuals homozygous for the recessive allele (t) cannot taste PTC. In a population consisting of 500 individuals, 347 are tasters and 153 are non-PTC tasters. Calculate the frequency of the T and t alleles in this population, and frequency of the genotypes.arrow_forward
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