Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 27, Problem 9CONQ
The ability to roll your tongue is inherited as a recessive trait. The frequency of the rolling allele is approximately 0.6, and that of the dominant (nonrolling) allele is 0.4. What is the frequency of individuals who can roll their tongues?
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Students have asked these similar questions
In humans, there is a gene that influences the ability to smell the
thioesters present in urine after asparagus is eaten. The ability to smell
these compounds is an autosomal dominant trait.
A is dominant and confers the ability to smell these thioesters
a is recessive and does NOT confer the ability to smell these
thioesters
p = freq (A) = frequency of allele A in the population = number of A
alleles/ total number of alleles
%3D
q = freq (a) = frequency of allele a in the population
where p + q = 1 and, therefore, p? + 2pq + q? = 1 and
%3D
%D
p? = freq (AA) = frequency of genotype AA = number of AA
individuals/ total number of individuals
%3D
2pq = freq (Aa) = frequency of genotype Aa
q? = freq (aa) = frequency of genotype aa
Phenotype
Number of People
Able to smell thioesters
378
Unable to smell thioesters
1323
Total
1701
1. Calculate p and q for this population.
2. Calculate p?, 2pq, and q? for this population.
In domestic cats, the allele (L) is a dominant allele for short-hair trait. The
recessive allele for long hair is (I). A female cat with a LI genotype has kittens
with a male cat with a II genotype. What is the probability that a kitten has short
hair?
Hint: it may be helpful to draw a Punnett Square.
/a2 = 32 Familier,
d. at least one girl?
3/32 = 968 Familier
In squash, fruit color is determined by one gene and fruit shape by another independently
segregating gene. The white fruit allele (W) is dominant to yellow fruit allele (w) and
disk shape fruit allele (D) is dominant to round-shaped fruit allele (d). A cross between a
white-colored, disk-shaped squash and a white colored, round-shaped squash resulted the
following offspring: 31 white, disk; 29 white, round; 9 yellow, disk; 10 yellow, round.
VIII.
a. What are the genotypes of the two plants that were crossed?
b. Using the chi-square test, determine if your answer in letter a is acceptable.
Chi computed
Degree of freedom
Chi tabulated
Conclusion
49
Chapter 27 Solutions
Genetics: Analysis and Principles
Ch. 27.1 - A gene pool is a. all of the genes in a single...Ch. 27.1 - 2. In natural populations, most genes...Ch. 27.1 - A gene exists in two alleles designatedDandd. If...Ch. 27.1 - Prob. 4COMQCh. 27.2 - Which of the following is a factor that, by...Ch. 27.3 - 1. Darwinian fitness is a measure...Ch. 27.3 - 2. Within a particular population, darkly colored...Ch. 27.3 - 3. A population occupies heterogeneous...Ch. 27.3 - Prob. 4COMQCh. 27.4 - 1. Genetic drift is
a. a change in allele...
Ch. 27.4 - 2. Which of the following influences on genetic...Ch. 27.5 - Gene flow depends on a. migration. b. the ability...Ch. 27.6 - 1. Inbreeding is sexual reproduction between...Ch. 27.7 - The mutation rate is a. the likelihood that a new...Ch. 27.7 - 2. The transfer of an antibiotic resistance gene...Ch. 27.7 - Prob. 3COMQCh. 27 - 1. What is the gene pool? How is a gene pool...Ch. 27 - Prob. 2CONQCh. 27 - Prob. 3CONQCh. 27 - Prob. 4CONQCh. 27 - The termpolymorphismcan refer to both genes and...Ch. 27 - Prob. 6CONQCh. 27 - For a gene existing in two alleles, what are the...Ch. 27 - 8. In a population, the frequencies of two...Ch. 27 - The ability to roll your tongue is inherited as a...Ch. 27 - What evolutionary factors can cause allele...Ch. 27 - What is the difference between a neutral and an...Ch. 27 - Prob. 12CONQCh. 27 - Prob. 13CONQCh. 27 - Describe the similarities and differences among...Ch. 27 - 15. Is each of the following examples due to...Ch. 27 - Prob. 16CONQCh. 27 - Prob. 17CONQCh. 27 - 18. A group of four birds flies to a new location...Ch. 27 - 19. Describe what happens to allele frequencies as...Ch. 27 - With regard to genetic drift, are the following...Ch. 27 - When two populations frequently intermix due to...Ch. 27 - Two populations of antelope are separated by a...Ch. 27 - Prob. 23CONQCh. 27 - 24. Using the pedigree shown here, answer the...Ch. 27 - A family pedigree is shown here. A. What is the...Ch. 27 - 26. A family pedigree is shown here.
A. What is...Ch. 27 - Prob. 27CONQCh. 27 - Prob. 28CONQCh. 27 - 1. You will need to be familiar with the...Ch. 27 - You will need to refer to question 2 in More...Ch. 27 - Prob. 3EQCh. 27 - Prob. 4EQCh. 27 - You will need to refer to question 2 in More...Ch. 27 - Prob. 6EQCh. 27 - Prob. 7EQCh. 27 - In the Grants study of the medium ground finch, do...Ch. 27 - 9. A recessive lethal allele has achieved a...Ch. 27 - Among a large population of 2 million gray...Ch. 27 - In a donor population, the allele frequencies for...Ch. 27 - Prob. 12EQCh. 27 - Prob. 13EQCh. 27 - Prob. 14EQCh. 27 - 15. What would you expect to be the minimum...Ch. 27 - Discuss examples of positive and negative...Ch. 27 - Discuss the role of mutation in the origin of...Ch. 27 - Prob. 3QSDC
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