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1
True or False: The masking of one gene's alleles by another gene's is known as epistasis.
A)True
B)False
2
Which of the following regarding polygenic inheritance is incorrect?
A)Quantitative traits vary over a broad range of phenotypes.
B)Phenotypes that are distinctly expressed are described as discrete
C)The contribution of many genes to a trait is polygenic.
D)Quantitative traits are unaffected by environmental factors.
E)All of these statements regarding polygenic inheritance are correct.
3
Which of the following do chloroplasts and mitochondria have in common?
A)Their genomes are typically maternally inherited.
B)They are believed to have evolved from ancestral prokaryotic species.
C)Their genomes code for proteins that function within the organelle itself.
D)Their genomes are typically smaller than the nuclear genome.
E)Chloroplasts and mitochondria have all of these choices in common.
4
Dosage compensation is accomplished by
A)genomic imprinting.
B)the maternal effect.
C)X inactivation.
D)the maternal effect and X activation.
E)genomic printing, the maternal effect, and X activation.
5
Which of the following statements most accurately defines epistasis?
A)The inheritance of two or more genes close together on the same chromosome.
B)A single gene affecting a single trait.
C)Inactivation of the allele from one parent and expression of the allele from the other parent.
D)The alleles of one gene masking the dominant alleles of another gene.
E)The genotype of the mother determining the phenotype of the offspring.
6
Which of the following terms would not be used to describe a trait that shows variation over a range of phenotypes?
A)Polygenic
B)Discrete
C)Quantitative
D)Continuous
E)All of these terms could be used to describe a trait that shows variation over a range of phenotypes.
7
Which of the following is not an example of an environmental factor affecting phenotypic expression in a population?
A)The amount of rain affects the yields of an orange crop.
B)The availability of nutrients affects the weight of a mammalian species.
C)The amount of time spent in the sunlight affects the skin color of a population.
D)The amount of sunlight affects the growth of a corn crop.
E)All of the choices are examples of environmental factors affecting phenotypic expressions.
8
Which of the following is an explanation proposed by T.H. Morgan to explain linkage groups?
A)Crossovers are more likely to occur between genes that are close together than genes that are farther apart.
B)Homologous chromosomes can exchange regions of DNA and create new combinations of alleles.
C)Traits determined by genes on different chromosomes are more likely to be inherited together.
D)Homologous chromosomes can exchange regions of DNA and create new combinations of alleles. And traits determined by genes on different chromosomes are more likely to be inherited together.
E)Crossovers are more likely to occur between genes that are close together than genes that are farther apart. Homologous chromosomes can exchange regions of DNA and create new combinations of alleles. And Traits determined by genes on different chromosomes are more likely to be inherited together.
9
Offspring which have a combination of traits from both parents are most accurately referred to as
A)parental types.
B)dominants.
C)recessives.
D)nonrecombinants.
E)homologs.
10
The description of the linear arrangement of genes is called a
A)genome project.
B)restriction map.
C)sequence map.
D)Morgan analysis.
E)genetic map.
11
Consulting Figure 17.5 on page 358 if necessary, which of the following traits is least likely to be linked with the trait for aristae length?
A)black body
B)brown eyes
C)dumpy wings
D)curved wings
E)All of these traits are equally likely to be inherited with the trait for aristae length.
12
True or False: If recombinant offspring of two linked genes are observed 13% of the time, those two genes are approximately 87 map units apart. (Genomes and Proteomes)
A)True
B)False
13
Which of the following terms refers to the phenotype of a trait depending solely on the phenotype of the maternal parent?
A)Paternal exclusion
B)Cytoplasmic inheritance
C)Organellar dominance
D)Maternal inheritance
E)Nuclear indifference
14
Which of the following statements regarding X inactivation is incorrect?
A)X inactivation is required for dosage compensation
B)No X inactivation in XX individuals is lethal
C)X inactivation in XX individuals results in Barr Body formation
D)Individuals with two Barr Bodies have Klinefelter syndrome
E)X chromosomes have X inactivation centers that must express the Xist gene in order for inactivation to occur.
15
In some plants, when the pollen and egg both contribute chloroplasts to the offspring, this mode of inheritance is called
A)maternal.
B)paternal.
C)biparental.
D)codominance.
E)linked.
16
Which of the following is not part of a typical mammalian mitochondrial genome?
A)Some of the structural genes for oxidative phosphorylation
B)The genes for mitochondrial tRNA molecules
C)The genes for mitochondrial rRNA molecules
D)The genes for mitochondrial DNA polymerase and RNA polymerase
E)All of these choices are coded for on mammalian mitochondrial genomes.
17
True or False: Epigenetic changes alter the genotype, but do not permanently affect the phenotype of the individual.
A)True
B)False
18
Which of the following cannot be affected by genomic imprinting?
A)A single gene
B)Part of a chromosome
C)An entire chromosome
D)All chromosomes inherited by one parent
E)Mitochondrial genome
19
Genomic imprinting is typically caused at the molecular level by ________ of DNA.
A)phosphorylation
B)acetylation
C)hydrolysis
D)methylation
E)glycosylation
20
True or False: Both genomic imprinting and maternal effect genes can result in two individual offspring with the same genotype but different phenotypes.
A)True
B)False





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