Human Biology: Concepts and Current Issues (8th Edition)
Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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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.
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