Question 1

Which of the following statements regarding genes is NOT true?

Accepted Answer

A)  Genes are located on chromosomes.
B)  Genes consist of a long sequence of DNA.
C)  Genes are the basic unit of information affecting a genetic trait.
D)  In sexually reproducing species, each cell contains a single copy of every gene.

Question 2

Which of the following statements is NOT true?

Accepted Answer

A)  Traits that are determined by the effect of more than one gene are known as polygenic.
B)  Environmental factors can alter the effects of genes.
C)  Most traits are under the control of more than one gene.
D)  A genotype is always expressed in the phenotype.

Question 3

Mendel's manuscript discussing his pea-breeding results is considered one of the two most important scientific papers of the nineteenth century because he was the first to explain how

Accepted Answer

A)  mutations produced the variety of alleles displayed by individuals of the same species.
B)  traits are passed from one generation to the next.
C)  meiosis controls the distribution of alleles to each gamete.
D)  genes are arranged on chromosomes in the cell.

Question 4

Differentiate between pleiotropy and polygenic traits.

Accepted Answer

Pleiotropy involves a single gene contro...

Question 5

The 9:3:3:1 ratio of phenotypes that occurs in the F2 generation of the cross shown can be explained using

Accepted Answer

A)  blending inheritance.
B)  Mendel's law of segregation only.
C)  Mendel's law of independent assortment only.
D)  both of Mendel's laws of genetic inheritance.

Question 6

Which of the following represents all of the possible gametes that can be formed by an individual with the genetic makeup FfGgHH?

Accepted Answer

A)  FGH, FgH, fGH, fgH
B)  Ff, Gg, HH
C)  FG, FH, Fg, fH, fG, fg, GH, gH
D)  FfGhHH, FFGGHH, ffgghh

Question 7

If Gregor Mendel had studied a polygenic trait that did not follow the straightforward single-gene, single-phenotype pattern, do you believe he would have been able to describe how genes are passed from parents to offspring? Justify your answer.

Accepted Answer

No. Studying traits with dominant and re...

Question 8

Which of the following did Mendel use to help him form the law of independent assortment?

Accepted Answer

A)  dihybrid crosses between pea plants
B)  monohybrid crosses between pea plants
C)  traits that were codominant
D)  traits with incomplete dominance

Question 9

A thoroughbred racehorse could have at most ________ alleles of the same gene.

Accepted Answer

A)  16
B)  8
C)  4
D)  2

Question 10

Which of the following statements explains how genetically identical plant clones can exhibit dramatic phenotypic variation?

Accepted Answer

A)  Environmental conditions under which plants are grown can cause variations in phenotypes.
B)  Plants undergo mutations to adapt to temperature extremes.
C)  Plants are able to shut off genes that are not adaptive in their current environment.
D)  Genetically identical plants cannot have different phenotypes.

Question 11

Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring analyzed. Which of the following statements about this situation is true?

Accepted Answer

A)  Both parents are heterozygotes.
B)  The offspring are either 100 percent homozygotes or 100 percent heterozygotes.
C)  The offspring represent the P generation.
D)  The gametes produced by the offspring will carry two alleles for this gene.

Question 12

Is it possible for two organisms with the same genotype to have different phenotypes? Explain your answer.

Accepted Answer

Yes. The expression of the gen...

Question 13

Which of the following is true for mutations?

Accepted Answer

A)  Mutations will affect the genotype without affecting the phenotype.
B)  Mutations will affect the phenotype without affecting the genotype.
C)  Mutations will affect the genotype, which may affect the phenotype.
D)  Mutations will affect the phenotype, which may affect the genotype.

Question 14

The leaf color of a certain plant is controlled by one gene. For that gene, the allele G = orange and g = green. You have a plant with orange leaves, but do not know whether that plant's genotype is GG or Gg. Which of the following would help you determine the plant's genotype?

Accepted Answer

A)  Cross the plant to another plant with orange leaves.
B)  Cross the plant to a plant with green leaves.
C)  Cross two true-breeding, orange-leaved plants to each other and then cross one of their offspring to the plant with the unknown genotype.
D)  Change the environment in which the plant grows to find the conditions that cause the leaves to produce the orange color.

Question 15

Which of the following is the mechanism described by Mendel that results in a new combination of alleles in a pea plant seed?

Accepted Answer

A)  the mutation of multiple alleles during mitosis
B)  the mutation of multiple alleles during meiosis
C)  the separation of alleles for two different genes during meiosis
D)  the separation of alleles for a single gene during meiosis

Question 16

A chestnut-colored horse is mated with a cremello (cream-colored)  horse. Over a 10-year period, all of their offspring are palominos. This pattern of inheritance is best explained by

Accepted Answer

A)  complete dominance.
B)  incomplete dominance.
C)  multiple gene effects.
D)  environmental effects on genes.

Question 17

The observable physical characteristics of an organism are known as its ________.

Accepted Answer

The answer of The observable physical characteristics of an organism...

Question 18

A single gene with one dominant allele for black hair (B) and one recessive allele for brown hair (b) controls hair color in mice. A male mouse with black hair mates with a female mouse with brown hair and they have 12 offspring. Are you able to determine the predicted ratio of hair color in their offspring using a Punnett square? Explain your answer.

Accepted Answer

Because the male mouse exhibits the domi...

Question 19

The pleiotropy that occurs when a single gene controls multiple skeletal traits in dogs, such as leg bone length and skull size, may be explained because

Accepted Answer

A)  dogs share a common ancestor.
B)  the skeletal traits are related in the overall function of the dog.
C)  dogs have lived with humans for thousands of years.
D)  the effect of this gene depends on the environment.

Question 20

One of the first medical tests a newborn receives determines if the child has phenylketonuria (PKU) . PKU is the result of a mutation in a single gene that causes mental retardation and a host of other phenotypes (light hair and skin color, eczema, and a "mousy" smell) . By detecting PKU early, doctors are able to reduce the effect of this condition with a modified diet. PKU is an example of

Accepted Answer

A)  epistasis.
B)  a polygenic trait.
C)  pleiotropy.
D)  codominance.

Exam 6: Patterns of Inheritance

The pleiotropy that occurs when a single gene controls multiple skeletal traits in dogs, such as leg bone length and skull size, may be explained because

Correct Answer
verified

A thoroughbred racehorse could have at most ________ alleles of the same gene.

Correct Answer
verified

The 9:3:3:1 ratio of phenotypes that occurs in the F2 generation of the cross shown can be explained using

Correct Answer
verified

Mendel's manuscript discussing his pea-breeding results is considered one of the two most important scientific papers of the nineteenth century because he was the first to explain how

Correct Answer
verified

Which of the following statements is NOT true?

Correct Answer
verified

Correct Answer
verified
Because the male mouse exhibits the domi...
View Answer

Is it possible for two organisms with the same genotype to have different phenotypes? Explain your answer.

Correct Answer
verified
Yes. The expression of the gen...
View Answer

The leaf color of a certain plant is controlled by one gene. For that gene, the allele G = orange and g = green. You have a plant with orange leaves, but do not know whether that plant's genotype is GG or Gg. Which of the following would help you determine the plant's genotype?

Correct Answer
verified

If Gregor Mendel had studied a polygenic trait that did not follow the straightforward single-gene, single-phenotype pattern, do you believe he would have been able to describe how genes are passed from parents to offspring? Justify your answer.

Correct Answer
verified
No. Studying traits with dominant and re...
View Answer

Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring analyzed. Which of the following statements about this situation is true?

Correct Answer
verified

Which of the following statements regarding genes is NOT true?

Correct Answer
verified

Differentiate between pleiotropy and polygenic traits.

Correct Answer
verified
Pleiotropy involves a single gene contro...
View Answer

Which of the following did Mendel use to help him form the law of independent assortment?

Correct Answer
verified

Correct Answer
verified

A chestnut-colored horse is mated with a cremello (cream-colored) horse. Over a 10-year period, all of their offspring are palominos. This pattern of inheritance is best explained by

Correct Answer
verified

The observable physical characteristics of an organism are known as its ________.

Correct Answer
verified

Which of the following is the mechanism described by Mendel that results in a new combination of alleles in a pea plant seed?

Correct Answer
verified

Which of the following is true for mutations?

Correct Answer
verified

Which of the following statements explains how genetically identical plant clones can exhibit dramatic phenotypic variation?

Correct Answer
verified

Which of the following represents all of the possible gametes that can be formed by an individual with the genetic makeup FfGgHH?

Correct Answer
verified

Exam 6: Patterns of Inheritance

The pleiotropy that occurs when a single gene controls multiple skeletal traits in dogs, such as leg bone length and skull size, may be explained because

Correct AnswerverifiedShow Answer

A thoroughbred racehorse could have at most ________ alleles of the same gene.

Correct AnswerverifiedShow Answer

The 9:3:3:1 ratio of phenotypes that occurs in the F2 generation of the cross shown can be explained using

Correct AnswerverifiedShow Answer

Mendel's manuscript discussing his pea-breeding results is considered one of the two most important scientific papers of the nineteenth century because he was the first to explain how

Correct AnswerverifiedShow Answer

Which of the following statements is NOT true?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedBecause the male mouse exhibits the domi...View AnswerShow Answer

Is it possible for two organisms with the same genotype to have different phenotypes? Explain your answer.

Correct AnswerverifiedYes. The expression of the gen...View AnswerShow Answer

The leaf color of a certain plant is controlled by one gene. For that gene, the allele G = orange and g = green. You have a plant with orange leaves, but do not know whether that plant's genotype is GG or Gg. Which of the following would help you determine the plant's genotype?

Correct AnswerverifiedShow Answer

If Gregor Mendel had studied a polygenic trait that did not follow the straightforward single-gene, single-phenotype pattern, do you believe he would have been able to describe how genes are passed from parents to offspring? Justify your answer.

Correct AnswerverifiedNo. Studying traits with dominant and re...View AnswerShow Answer

Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring analyzed. Which of the following statements about this situation is true?

Correct AnswerverifiedShow Answer

Which of the following statements regarding genes is NOT true?

Correct AnswerverifiedShow Answer

Differentiate between pleiotropy and polygenic traits.

Correct AnswerverifiedPleiotropy involves a single gene contro...View AnswerShow Answer

Which of the following did Mendel use to help him form the law of independent assortment?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A chestnut-colored horse is mated with a cremello (cream-colored) horse. Over a 10-year period, all of their offspring are palominos. This pattern of inheritance is best explained by

Correct AnswerverifiedShow Answer

The observable physical characteristics of an organism are known as its ________.

Correct AnswerverifiedShow Answer

Which of the following is the mechanism described by Mendel that results in a new combination of alleles in a pea plant seed?

Correct AnswerverifiedShow Answer

Which of the following is true for mutations?

Correct AnswerverifiedShow Answer

Which of the following statements explains how genetically identical plant clones can exhibit dramatic phenotypic variation?

Correct AnswerverifiedShow Answer

Which of the following represents all of the possible gametes that can be formed by an individual with the genetic makeup FfGgHH?

Correct AnswerverifiedShow Answer

Correct Answer
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Because the male mouse exhibits the domi...
View Answer

Correct Answer
verified
Yes. The expression of the gen...
View Answer

Correct Answer
verified

Correct Answer
verified
No. Studying traits with dominant and re...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified
Pleiotropy involves a single gene contro...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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