Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 3TY
Which of the following statements correctly expresses the relationship between dominant and recessive alleles?
a. A dominant allele is always the preferred or most beneficial allele.
b. A dominant allele is only expressed when it is homozygous.
c. A dominant allele masks the expression of a recessive allele in a heterozygote.
d. A dominant allele is always the most numerous allele in the population.
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Alleles that show incomplete dominance will represent:
Choose oneAnswer:
A . heterozygotes that have a phenotype intermediate between the dominant and recessive alleles.
B. homozygotes that have a genotype like the recessive allele
C. homozygotes that have a phenotype intermediate between the dominant and recessive alleles.
D. heterozygotes that have a genotype like the dominant allele
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.
The difference between dominant and recessive traits is …
Group of answer choices:
A.genes for dominant traits are passed on preferentially.
B.effects of recessive traits can be hidden by effects of dominant traits.
C.recessive traits are deleterious (bad for the organism) and dominant traits are not.
D.dominant genes produce proteins, recessive genes do not.
E.dominant traits are more likely to be expressed in males.
Chapter 19 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
Ch. 19 - If you might be a carrier of a gene for an...Ch. 19 - Prob. 2QCCh. 19 - Prob. 1CRCh. 19 - Prob. 2CRCh. 19 -
3. Distinguish between genotype and phenotype.
Ch. 19 - Describe the contributions of Mendel to the field...Ch. 19 - Explain how alterations of chromosome number and...Ch. 19 - Prob. 6CRCh. 19 - Prob. 7CRCh. 19 - Describe what is meant by sex-linked inheritance.
Ch. 19 -
9. Explain why lethal diseases caused by dominant...Ch. 19 - Prob. 10CRCh. 19 - All of the following statements about homologous...Ch. 19 - Prob. 2TYCh. 19 -
3. Which of the following statements correctly...Ch. 19 - Prob. 4TYCh. 19 - Prob. 5TYCh. 19 - Prob. 6TYCh. 19 - Prob. 7TYCh. 19 - Which of the following results in the separation...Ch. 19 - Prob. 9TYCh. 19 - Prob. 10TYCh. 19 - What tool is used to determine the probabilities...Ch. 19 - Prob. 12TYCh. 19 - What is the basis for the tremendous genetic...Ch. 19 - Prob. 14TYCh. 19 -
15. Which of the following events or processes...Ch. 19 -
1. What fraction of the offspring of two...Ch. 19 -
2. Why is it that the range of resting blood...Ch. 19 - Prob. 3AWKCh. 19 - Geneticists often study patterns of gene transfer...Ch. 19 - Prob. 5AWKCh. 19 - Prob. 6AWKCh. 19 - Nondisjunction during meiosis can lead to the...
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