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block

What is indicated when a single-character testcross yields offspring that all have the dominant phenotype?

Select the correct answer(s).  

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Both parents are heterozygous.

Epistasis has occurred.

The parent with the dominant phenotype was heterozygous.

The parent with the dominant phenotype was homozygous.

The alleles are codominant.

none

If the two traits that Mendel looked at in his dihybrid cross of smooth yellow peas with wrinkled green peas had been controlled by genes that were located near each other on the same chromosome, then the F2 generation _____.

Select the correct answer(s).  

(0/0)

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would have contained four phenotypes in a 9:3:3:1 ratio

would have contained only individuals that were heterozygous at both loci

None of the listed responses is correct.

would have contained no individuals that were heterozygous at both loci

would have deviated from the 9:3:3:1 phenotypic ratio that is predicted by the law of independent assortment

none

Physically, what are different alleles?

Select the correct answer(s).  

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Different alleles are different DNA sequences found at the same locus on sister chromatids.

Different alleles are different DNA sequences found at the same locus on homologous chromosomes.

Different alleles are different characters found on different non-homologous chromosomes

None of the listed responses is correct.

Different alleles are different particles found in gametes.

none

The F1 generation differed from the F2 in Mendel's experiments in that _____.

Select the correct answer(s).  

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all of the F1 showed the dominant phenotype, but only three-fourths of the F2 did

none of the F1 showed the dominant phenotype, but one-half of the F2 did

one-half of the F1 showed the dominant phenotype, and three-fourths of the F2 did

all of the F1 showed the dominant phenotype, and all of the F2 showed the recessive phenotype

all of the F1 showed the dominant phenotype, whereas only half of the F2 did

none

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 _____.

Select the correct answer(s).  

(0/0)

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Aabbcc

AABBCc

AaBBcc

aabbcc

None of the listed responses is correct.

none

Homologous pairs of chromosomes often _____.

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(0/0)

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contain different alleles

carry different genes for different traits

are paired up in the G2 phase of the cell cycle

differ in length

are not both present in diploid somatic cells

none

In Mendel's monohybrid cross of purple-flowered and white-flowered peas, all members of the F1 generation had the _____ phenotype because their genotype was _____ at the flower-color locus.

Select the correct answer(s).  

(0/0)

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purple-flowered ... homozygous dominant

white-flowered ... Heterozygous

purple-flowered ... homozygous recessive

white-flowered ... homozygous recessive

purple-flowered ... Heterozygous

none

If an organism that is homozygous dominant is crossed with a heterozygote for that trait, the offspring will be _____.

Select the correct answer(s).  

(0/0)

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all homozygous recessive

all homozygous dominant

present in a 9:3:3:1 ratio

all of the dominant phenotype

1/4 of the recessive phenotype

none

The law of independent assortment _____.

Select the correct answer(s).  

(0/0)

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A and B are correct.

C. states that the alleles at different loci segregate independently from one another during a dihybrid cross

B. applies only to genes that are present on different chromosomes (or behave as if they were)

A. can account for a 9:3:3:1 ratio seen in the F2 generation

A, B, and C are correct.

none

In carrying out his breeding studies, Mendel examined characters that had which of the following properties?

Select the correct answer(s).  

(0/0)

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All of the listed responses are correct.

It was possible to isolate true-breeding varieties for each trait.

They were controlled by loci that were (or behaved as if they were) on different chromosomes.

The characters each were controlled by a single gene.

The traits varied in an either-or fashion.

none

Assume tall (T) is completely dominant to dwarf (t) in a certain species of plant. If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will _____.

Select the correct answer(s).  

(0/0)

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all be short

be 1/2 tall and 1/2 dwarf

all be tall

all be intermediate in height

be 3/4 tall and 1/4 dwarf

none

If each parent can produce 100 genetically distinct gametes, how many genetically distinct offspring can two parents produce?

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(0/0)

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200

1,000,000

1,000

100

10000

none

If a plant variety is true-breeding for a dominant trait, then _____.

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(0/0)

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the variety is unable to mutate

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

the plant is heterozygous for the trait

if the plant were allowed to self-pollinate, the dominant and recessive traits would consistently appear in a 3:1 ratio among the progeny

if the plant were allowed to self-pollinate, all of the progeny would have the dominant trait

none

Which choice below is a basic difference between Mendel's particulate hypothesis and the hypothesis of blending inheritance?

Select the correct answer(s).  

(0/0)

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The blending inheritance hypothesis, but not the particulate hypothesis, maintained that the two alleles at any given locus are always different.

The blending inheritance hypothesis, but not the particulate hypothesis, maintained that mutation is the major source of new gene combinations.

The blending inheritance hypothesis, but not the particulate hypothesis, maintained that after a mating, the genetic material provided by each of the two parents is mixed in the offspring, losing its individual identity.

The blending inheritance hypothesis, but not the particulate hypothesis, maintained that the traits governed by genes in the egg are different from the traits governed by genes in the sperm.

All of the listed responses are correct.

none

Pea plants are tall if they have the genotype TT or Tt, and they are short if they have genotype tt. A tall plant is mated with a short plant. Which outcome below would indicate that the tall parent plant was heterozygous?

Select the correct answer(s).  

(0/0)

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All of the offspring are short.

The ratio of tall offspring to short offspring is 1:1.

All of the offspring are tall.

There is not enough information to answer the question.

The ratio of tall offspring to short offspring is 3:1.