Multiple Choice Questions Chp 14 and 15 Review Multiple Choice Questions

If a plant variety is true-breeding for a dominant trait, then _____.   if the plant were allowed to self-pollinate, the dominant and recessive traits would consistently appear in a 3:1 ratio among the progeny   the plant is heterozygous for the trait   if the plant were crossed with a heterozygote, one-half of the progeny would show the dominant trait, and one-half would show the recessive trait   if the plant were allowed to self-pollinate, all of the progeny would have the dominant trait   the variety is immune to mutation

If a plant variety is true-breeding for a dominant trait, then _____.   if the plant were allowed to self-pollinate, the dominant and recessive traits would consistently appear in a 3:1 ratio among the progeny   the plant is heterozygous for the trait   if the plant were crossed with a heterozygote, one-half of the progeny would show the dominant trait, and one-half would show the recessive trait   if the plant were allowed to self-pollinate, all of the progeny would have the dominant trait   the variety is immune to mutation

all be intermediate in height all be tall be 1/2 tall and 1/2 dwarf Assume tall (T) is completely dominant to dwarf (t). If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will _____. all be intermediate in height   all be tall   be 1/2 tall and 1/2 dwarf   be 3/4 tall and 1/4 dwarf   all be short

all be intermediate in height all be tall be 1/2 tall and 1/2 dwarf Assume tall (T) is completely dominant to dwarf (t). If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will _____. all be intermediate in height   all be tall   be 1/2 tall and 1/2 dwarf   be 3/4 tall and 1/4 dwarf   all be short

Aabbcc aabbcc AaBBcc AABBCc none of the above In a certain plant, the alleles A, B, and C are completely dominant to the alleles a, b, and c. A plant with the genotype AABbcc will have the same phenotype as a plant with the genotype _____.  Aabbcc   aabbcc   AaBBcc   AABBCc   none of the above

Aabbcc aabbcc AaBBcc AABBCc none of the above In a certain plant, the alleles A, B, and C are completely dominant to the alleles a, b, and c. A plant with the genotype AABbcc will have the same phenotype as a plant with the genotype _____.  Aabbcc   aabbcc   AaBBcc   AABBCc   none of the above

It was possible to isolate true-breeding varieties for each trait. In carrying out his breeding studies, Mendel examined characters that had which of the following properties?   They were controlled by loci that were (or behaved as if they were) on different chromosomes.   It was possible to isolate true-breeding varieties for each trait.   The traits varied in an either-or fashion.   The characters each were controlled by a single gene.   All of the above.

It was possible to isolate true-breeding varieties for each trait. In carrying out his breeding studies, Mendel examined characters that had which of the following properties?   They were controlled by loci that were (or behaved as if they were) on different chromosomes.   It was possible to isolate true-breeding varieties for each trait.   The traits varied in an either-or fashion.   The characters each were controlled by a single gene.   All of the above.

Homologous pairs of chromosomes often _____.  carry different genes for different traits   differ in length   contain different alleles   are not both present in diploid somatic cells   are paired up in the G2 phase of the cell cycle

Homologous pairs of chromosomes often _____.  carry different genes for different traits   differ in length   contain different alleles   are not both present in diploid somatic cells   are paired up in the G2 phase of the cell cycle

nonhomologous epistatic codominant polygenic completely dominant A red bull is crossed with a white cow and all of the offspring are roan, an intermediate color that is caused by the presence of both red and white hairs. This is an example of genes that are _____.  nonhomologous   epistatic   codominant   polygenic   completely dominant

nonhomologous epistatic codominant polygenic completely dominant A red bull is crossed with a white cow and all of the offspring are roan, an intermediate color that is caused by the presence of both red and white hairs. This is an example of genes that are _____.  nonhomologous   epistatic   codominant   polygenic   completely dominant

A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes? A or B only   AB only   AB or O   A, B, or O   A, B, AB, or O

A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes? A or B only   AB only   AB or O   A, B, or O   A, B, AB, or O

Which of the following matings cannot produce a child with blood type O? The letters refer to blood types (phenotypes). A x A   A x B   O x AB   O x O   none of the above

Which of the following matings cannot produce a child with blood type O? The letters refer to blood types (phenotypes). A x A   A x B   O x AB   O x O   none of the above

A single genetic locus that controls more than one trait is said to be _____. polygenic   epistatic   pleiotropic   autotrophic   somatic

A single genetic locus that controls more than one trait is said to be _____. polygenic   epistatic   pleiotropic   autotrophic   somatic

male of unknown genotype Tay-Sachs disease runs in Rebecca's family. On a family pedigree, she saw a shaded circle. This represented a _____. male with Tay-Sachs   female carrier   male carrier   female with Tay-Sachs   male of unknown genotype

male of unknown genotype Tay-Sachs disease runs in Rebecca's family. On a family pedigree, she saw a shaded circle. This represented a _____. male with Tay-Sachs   female carrier   male carrier   female with Tay-Sachs   male of unknown genotype

Tom's brother suffers from phenylketonuria (PKU), a recessive disorder Tom's brother suffers from phenylketonuria (PKU), a recessive disorder. The brothers' parents do not have PKU. What are the chances that Tom, who is normal for this trait, is a carrier of PKU? 1/4   1/3   1/2   2/3   4/3

Tom's brother suffers from phenylketonuria (PKU), a recessive disorder Tom's brother suffers from phenylketonuria (PKU), a recessive disorder. The brothers' parents do not have PKU. What are the chances that Tom, who is normal for this trait, is a carrier of PKU? 1/4   1/3   1/2   2/3   4/3

Because mosquitoes can transfer the disease from person to person. Cystic fibrosis, which is usually lethal before the age of reproduction, is a homozygous recessive trait. Why do cases continue to arise, even though people with the disease rarely live to reproduce? Because new mutations continually introduce this harmful condition into the population.   Because the harmful allele "hides" within heterozygous individuals, one-fourth of the offspring of two heterozygotes would be afflicted.   Because mosquitoes can transfer the disease from person to person.   Because people continue to make inappropriate lifestyle choices.   None of the above.

Because mosquitoes can transfer the disease from person to person. Cystic fibrosis, which is usually lethal before the age of reproduction, is a homozygous recessive trait. Why do cases continue to arise, even though people with the disease rarely live to reproduce? Because new mutations continually introduce this harmful condition into the population.   Because the harmful allele "hides" within heterozygous individuals, one-fourth of the offspring of two heterozygotes would be afflicted.   Because mosquitoes can transfer the disease from person to person.   Because people continue to make inappropriate lifestyle choices.   None of the above.

Huntington's disease is an example of a genetic disorder caused by _____. a lethal dominant allele that afflicts an individual later in life   a nonlethal dominant allele   a late-acting recessive allele   homozygous recessive alleles   multiple alleles

Huntington's disease is an example of a genetic disorder caused by _____. a lethal dominant allele that afflicts an individual later in life   a nonlethal dominant allele   a late-acting recessive allele   homozygous recessive alleles   multiple alleles

Chapter 15

They have a long generation time. Drosophila is a useful organism for genetic studies for all of the following reasons except _____. They have a long generation time.   A single mating can produce many offspring.   They have a small number of chromosomes.   Drosophila chromosomes can be easily distinguishable under a light microscope.   All of the above

They have a long generation time. Drosophila is a useful organism for genetic studies for all of the following reasons except _____. They have a long generation time.   A single mating can produce many offspring.   They have a small number of chromosomes.   Drosophila chromosomes can be easily distinguishable under a light microscope.   All of the above

Wild type refers to _____. the most common phenotype in the natural population   the most extreme mutant phenotype observed in an experiment   any mutant genotype   a kind of chromosomal deletion   extranuclear genes

Wild type refers to _____. the most common phenotype in the natural population   the most extreme mutant phenotype observed in an experiment   any mutant genotype   a kind of chromosomal deletion   extranuclear genes

If two genes are linked, _____. they are on different chromosomes   they assort independently   they code for the same protein   they are on the same chromosome   they are on sex chromosomes

If two genes are linked, _____. they are on different chromosomes   they assort independently   they code for the same protein   they are on the same chromosome   they are on sex chromosomes

The recombination frequency between two gene loci is _____.   dependent on the sex of the parent   greater as the distance between the two loci increases   greater as the distance between the two loci decreases   dependent on whether dominant or recessive alleles are carried at the two loci   equal to the size of the chromosome

The recombination frequency between two gene loci is _____. dependent on the sex of the parent   greater as the distance between the two loci increases   greater as the distance between the two loci decreases   dependent on whether dominant or recessive alleles are carried at the two loci   equal to the size of the chromosome