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Physically, what are different alleles?

Select the correct answer(s).  

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Different alleles are different particles found in gametes.

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

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

None of the listed responses is correct.

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

none

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

Select the correct answer(s).  

(0/0)

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

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

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).  

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AaBBcc

Aabbcc

None of the listed responses is correct.

AABBCc

aabbcc

none

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

Select the correct answer(s).  

(0/0)

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The parent with the dominant phenotype was heterozygous.

The parent with the dominant phenotype was homozygous.

Both parents are heterozygous.

Epistasis has occurred.

The alleles are codominant.

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).  

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purple-flowered ... homozygous recessive

white-flowered ... Heterozygous

white-flowered ... homozygous recessive

purple-flowered ... homozygous dominant

purple-flowered ... Heterozygous

none

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

Select the correct answer(s).  

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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 traits varied in an either-or fashion.

The characters each were controlled by a single gene.

none

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

Select the correct answer(s).  

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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 two alleles at any given locus are always different.

All of the listed responses are correct.

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 the traits governed by genes in the egg are different from the traits governed by genes in the sperm.

none

Homologous pairs of chromosomes often _____.

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contain different alleles

are paired up in the G2 phase of the cell cycle

carry different genes for different traits

are not both present in diploid somatic cells

differ in length

none

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

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1/4 of the recessive phenotype

all homozygous recessive

all of the dominant phenotype

all homozygous dominant

present in a 9:3:3:1 ratio

none

The law of independent assortment _____.

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A, B, and C are correct.

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

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

A and B are correct.

none

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

Select the correct answer(s).  

(0/0)

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100

1,000,000

200

1,000

10000

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 tall

all be intermediate in height

be 1/2 tall and 1/2 dwarf

all be short

be 3/4 tall and 1/4 dwarf

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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There is not enough information to answer the question.

All of the offspring are tall.

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

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

All of the offspring are short.

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 no individuals that were heterozygous at both loci

None of the listed responses is correct.

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

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

would have contained only individuals that were heterozygous at both loci

none

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

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(0/0)

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

the variety is unable to mutate

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, the dominant and recessive traits would consistently appear in a 3:1 ratio among the progeny