Question 1

Multiple effects of a single gene is

Accepted Answer

A) expressivity. 
B) penetrance. 
C) codominance. 
D) pleiotropy. 
E) multiple alleles. 
A) expressivity. 
B) penetrance. 
C) codominance. 
D) pleiotropy. 
E) multiple alleles.

Question 2

Assume that short hair (L) is dominant to long hair (l) and black hair (B) is dominant to brown (b).If you find a black, short-haired animal, you can determine its genotype by crossing it to an animal with a genotype of

Accepted Answer

A) LL BB. 
B) ll BB. 
C) ll Bb. 
D) ll bb. 
E) LL bb. 
A) LL BB. 
B) ll BB. 
C) ll Bb. 
D) ll bb. 
E) LL bb.

Question 3

A dihybrid cross of two contrasting pure-breeding organisms

Accepted Answer

A) produces homozygous offspring. 
B) must produce a phenotype different from either pure-breeding parent. 
C) results in the disappearance of the recessive traits in the first generation. 
D) takes place only in the laboratory under precisely controlled conditions. 
E) will result in the immediate formation of another pure-breeding variety. 
A) produces homozygous offspring. 
B) must produce a phenotype different from either pure-breeding parent. 
C) results in the disappearance of the recessive traits in the first generation. 
D) takes place only in the laboratory under precisely controlled conditions. 
E) will result in the immediate formation of another pure-breeding variety.

Question 4

In radishes, red and white are the pure-breeding colors, and long and round are the pure-breeding shapes, while the hybrids are purple and oval.The cross of a red, long radish and a white, round radish will produce an F2 generation in which

Accepted Answer

A) the most common phenotype will be oval and purple. 
B) the purple color will occur with all three shapes of radish. 
C) the red color will occur with all three shapes of radish. 
D) all white, long forms produced will be pure-breeding. 
E) all of these are true. 
A) the most common phenotype will be oval and purple. 
B) the purple color will occur with all three shapes of radish. 
C) the red color will occur with all three shapes of radish. 
D) all white, long forms produced will be pure-breeding. 
E) all of these are true.

Question 5

Using the illustration below and the assumption that half of a plant's sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is

Accepted Answer

A) 1/2 x 1/2. 
B) 25 percent. 
C) one out of four. 
D) 1/2. 
E) all of these EXCEPT 1/2. 
A) 1/2 x 1/2. 
B) 25 percent. 
C) one out of four. 
D) 1/2. 
E) all of these EXCEPT 1/2.

Question 6

An incompletely dominant gene controls the color of chickens so that BB produces black, Bb produces a slate-gray color called blue, and bb produces splashed white.A second gene controls comb shape, with the dominant gene R producing a rose comb and r producing a single comb.If a pure-breeding, black chicken with a rose comb is mated to a splashed-white chicken with a single comb in the F2 generation, what fraction of the offspring will be blue with single comb?

Accepted Answer

A) 9/16 
B) 3/8 
C) 3/16 
D) 1/8 
E) 1/16 
A) 9/16 
B) 3/8 
C) 3/16 
D) 1/8 
E) 1/16

Question 7

The F2 phenotypic ratio of 9:3:4 is a result of a cross involving

Accepted Answer

A) two genes expressing complete dominance. 
B) a gene expressing dominance and another gene expressing codominance. 
C) two genes expressing codominance. 
D) epistasis, in which one gene modifies the expression of the other gene. 
E) multiple alleles. 
A) two genes expressing complete dominance. 
B) a gene expressing dominance and another gene expressing codominance. 
C) two genes expressing codominance. 
D) epistasis, in which one gene modifies the expression of the other gene. 
E) multiple alleles.

Question 8

If Mendel had not examined the __________ generation, he would not have discovered his theory of segregation.

Accepted Answer

A) P1 
B) H1 
C) A1 
D) F1 
E) F2 
A) P1 
B) H1 
C) A1 
D) F1 
E) F2

Question 9

If the F1 gametes show a distribution pattern like that shown in the illustration below, then they present an example of

Accepted Answer

A) independent assortment. 
B) full linkage. 
C) crossing over. 
D) incomplete linkage. 
E) crossing over and incomplete linkage. 
A) independent assortment. 
B) full linkage. 
C) crossing over. 
D) incomplete linkage. 
E) crossing over and incomplete linkage.

Question 10

Susan, a mother with type B blood, has a child with type O blood.She claims that Craig, who has type A blood, is the father.He claims that he cannot possibly be the father.Further blood tests ordered by the judge reveal that Craig is AA.The judge rules that

Accepted Answer

A) Susan is right, and Craig must pay child support. 
B) Craig is right and doesn't have to pay child support. 
C) Susan cannot be the real mother of the child; there must have been an error made at the hospital. 
D) it is impossible to reach a decision based on the limited data available. 
E) none of these is true. 
A) Susan is right, and Craig must pay child support. 
B) Craig is right and doesn't have to pay child support. 
C) Susan cannot be the real mother of the child; there must have been an error made at the hospital. 
D) it is impossible to reach a decision based on the limited data available. 
E) none of these is true.

Question 11

All of the genes located on a given chromosome constitute

Accepted Answer

A) a karyotype. 
B) a bridging cross. 
C) a wild-type allele. 
D) a linkage group. 
E) none of these. 
A) a karyotype. 
B) a bridging cross. 
C) a wild-type allele. 
D) a linkage group. 
E) none of these.

Question 12

Which offspring in the illustration below are homozygous recessive for both traits?

Accepted Answer

A) A   
B) B 
C) C 
D) D 
E) none of these 
A) A   
B) B 
C) C 
D) D 
E) none of these

Question 13

Coat color in one breed of mice is controlled by incompletely dominant alleles so that yellow and white are homozygous while cream is heterozygous.The cross of two cream individuals will produce

Accepted Answer

A) all cream offspring. 
B) equal numbers of white and yellow mice, but no cream offspring. 
C) equal numbers of white and cream mice. 
D) equal numbers of yellow and cream mice. 
E) equal numbers of white and yellow mice, with twice as many creams as the other two colors. 
A) all cream offspring. 
B) equal numbers of white and yellow mice, but no cream offspring. 
C) equal numbers of white and cream mice. 
D) equal numbers of yellow and cream mice. 
E) equal numbers of white and yellow mice, with twice as many creams as the other two colors.

Question 14

Mendel would not have seen four different phenotypes in the F2 generation of his dihybrid crosses if

Accepted Answer

A) the genes were on the same chromosomes. 
B) the P1 generation was homozygous. 
C) purple was dominant to white. 
D) more than two traits were traced. 
E) all of these are true. 
A) the genes were on the same chromosomes. 
B) the P1 generation was homozygous. 
C) purple was dominant to white. 
D) more than two traits were traced. 
E) all of these are true.

Question 15

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).In the F2 generation of a cross between BB ss with bb SS, what fraction of the offspring are expected to be black and spotted?

Accepted Answer

A) 1/16 
B) 9/16 
C) 1/9 
D) 3/16 
E) 3/4 
A) 1/16 
B) 9/16 
C) 1/9 
D) 3/16 
E) 3/4

Question 16

Which of the following is a homozygous genotype?

Accepted Answer

A) AaBB 
B) aABB 
C) aaBB 
D) aaBb 
E) AaBb 
A) AaBB 
B) aABB 
C) aaBB 
D) aaBb 
E) AaBb

Question 17

The variation of the color in Siamese cats is due to

Accepted Answer

A) incomplete codominance. 
B) inactive X chromosomes. 
C) environmental effects on phenotypes. 
D) quantitative inheritance. 
E) multiple alleles. 
A) incomplete codominance. 
B) inactive X chromosomes. 
C) environmental effects on phenotypes. 
D) quantitative inheritance. 
E) multiple alleles.

Question 18

Mendel's theory of independent assortment states that

Accepted Answer

A) one allele is always dominant to another. 
B) hereditary units from the male and female parents are blended in the offspring. 
C) the two hereditary units that influence a certain trait segregate during gamete formation. 
D) each hereditary unit is inherited separately from other hereditary units. 
E) all of these are true. 
A) one allele is always dominant to another. 
B) hereditary units from the male and female parents are blended in the offspring. 
C) the two hereditary units that influence a certain trait segregate during gamete formation. 
D) each hereditary unit is inherited separately from other hereditary units. 
E) all of these are true.

Question 19

If short hair (L) is dominant to long hair (l), then to determine the genotype of a short-haired animal it should be crossed with

Accepted Answer

A) LL. 
B) Ll. 
C) ll. 
D) all of these. 
E) none of these. 
A) LL. 
B) Ll. 
C) ll. 
D) all of these. 
E) none of these.

Question 20

Which of the following is false about Marfan syndrome?

Accepted Answer

A) It results from an autosomal dominant mutation. 
B) The affected gene produces a defective form of the protein fibrillin. 
C) Aortas of Marfan's patients are susceptible to rupture. 
D) It affects one in five thousand men and women. 
E) None of these is false. 
A) It results from an autosomal dominant mutation. 
B) The affected gene produces a defective form of the protein fibrillin. 
C) Aortas of Marfan's patients are susceptible to rupture. 
D) It affects one in five thousand men and women. 
E) None of these is false.

Exam 11: Observing Patterns in Inherited Traits

Multiple effects of a single gene is

Assume that short hair (L) is dominant to long hair (l) and black hair (B) is dominant to brown (b).If you find a black, short-haired animal, you can determine its genotype by crossing it to an animal with a genotype of

A dihybrid cross of two contrasting pure-breeding organisms

In radishes, red and white are the pure-breeding colors, and long and round are the pure-breeding shapes, while the hybrids are purple and oval.The cross of a red, long radish and a white, round radish will produce an F2 generation in which

Using the illustration below and the assumption that half of a plant's sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is

The F2 phenotypic ratio of 9:3:4 is a result of a cross involving

If Mendel had not examined the __________ generation, he would not have discovered his theory of segregation.

If the F1 gametes show a distribution pattern like that shown in the illustration below, then they present an example of

Susan, a mother with type B blood, has a child with type O blood.She claims that Craig, who has type A blood, is the father.He claims that he cannot possibly be the father.Further blood tests ordered by the judge reveal that Craig is AA.The judge rules that

All of the genes located on a given chromosome constitute

Which offspring in the illustration below are homozygous recessive for both traits?

Coat color in one breed of mice is controlled by incompletely dominant alleles so that yellow and white are homozygous while cream is heterozygous.The cross of two cream individuals will produce

Mendel would not have seen four different phenotypes in the F2 generation of his dihybrid crosses if

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).In the F2 generation of a cross between BB ss with bb SS, what fraction of the offspring are expected to be black and spotted?

Which of the following is a homozygous genotype?

The variation of the color in Siamese cats is due to

Mendel's theory of independent assortment states that

If short hair (L) is dominant to long hair (l), then to determine the genotype of a short-haired animal it should be crossed with

Which of the following is false about Marfan syndrome?

Invitation to Biology

Lifes Chemical Basis

Molecules of Life

Cell Structure and Function

A Closer Look at Cell Membranes

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Controls Over Genes

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Emergence of Evolutionary Thought

Organizing Information About Species

The Origin and Evolution of Life

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

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In radishes, red and white are the pure-breeding colors, and long and round are the pure-breeding shapes, while the hybrids are purple and oval.The cross of a red, long radish and a white, round radish will produce an F₂ generation in which

The F₂ phenotypic ratio of 9:3:4 is a result of a cross involving

If the F₁gametes show a distribution pattern like that shown in the illustration below, then they present an example of

Mendel would not have seen four different phenotypes in the F₂ generation of his dihybrid crosses if

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).In the F₂ generation of a cross between BB ss with bb SS, what fraction of the offspring are expected to be black and spotted?