Question 1

What is the key to the recognition of incomplete dominance?

Accepted Answer

A)   The phenotype of the heterozygote falls between the phenotypes of the homozygotes.
B)   The trait exhibits a continuous distribution.
C)   The alleles affect more than one trait.
D)   The heterozygote expresses the phenotype of both homozygotes.E) None of the above
F) All of the above

Question 2

Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Accepted Answer

A)   2:1
B)   1:1
C)   1:2:1
D)   3:1E) All of the above
F) C) and D)

Question 3

Marfan syndrome is the result of inheriting a single allele. Individuals with Marfan syndrome are tall and long-limbed,and have both cardiovascular and eye defects. The inheritance of Marfan syndrome is an example of ______.

Accepted Answer

A)   codominance
B)   a recessive disorder
C)   pleiotropy
D)   incomplete dominanceE) A) and B)
F) A) and D)

Question 4

Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Accepted Answer

A)   0%
B)   25%
C)   50%
D)   75%E) None of the above
F) All of the above

Question 5

The ______ is most commonly found in nature.

Accepted Answer

A)   recessive trait
B)   wild-type trait
C)   parental
D)   dominant traitE) A) and B)
F) All of the above

Question 6

Mendel crossed purebred purple-flowered plants with purebred white-flowered plants,and all of the resulting offspring produced purple flowers.The offspring are all ______,and the allele for purple flowers is ______.

Accepted Answer

A)   heterozygotes... recessive
B)   heterozygotes... dominant
C)   homozygotes... recessive
D)   homozygotes... dominantE) A) and D)
F) C) and D)

Question 7

An individual who is homozygous ______.

Accepted Answer

A)   expresses the dominant trait
B)   carries two different alleles for a gene
C)   carries two copies of the same allele for a gene
D)   expresses the recessive traitE) B) and C)
F) A) and D) C

Question 8

Alleles are described as ______.

Accepted Answer

A)   homologous chromosomes
B)   environmental factors that affect gene expression
C)   alternate versions of a gene
D)   alternate phenotypesE) C) and D)
F) A) and D) C

Question 9

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The seeds of all of the offspring are yellow.Why?

Accepted Answer

A)   The yellow allele is recessive to the green allele.
B)   All of the offspring are homozygous yellow.
C)   The yellow allele is dominant to the green allele.
D)   The alleles are codominant.E) None of the above
F) All of the above

Question 10

Round seeds (R) are dominant to wrinkled seeds (r) ,and yellow seeds (Y) are dominant to green seeds (y) . What is the expected phenotypic ratio of a cross between an RrYy and an rryy individual?

Accepted Answer

A)   1:2:1
B)   9:3:3:1
C)   3:1
D)   1:1:1:1E) A) and D)
F) All of the above

Question 11

To determine the phenotype of an individual who expresses a dominant trait,you would cross that individual with an individual who ______.

Accepted Answer

A)   expresses the dominant trait
B)   is homozygous recessive for that trait
C)   is homozygous dominant for that trait
D)   is heterozygous for that traitE) None of the above
F) A) and B)

Question 12

Achondroplasia is a form of dwarfism caused by a dominant allele.The homozygous dominant genotype causes death,so individuals who have this condition are all heterozygotes.If a person with achondroplasia mates with a person who does not have achondroplasia,what percentage of their children would be expected to have achondroplasia?

Accepted Answer

A)   0%
B)   50%
C)   75%
D)   100%E) A) and B)
F) A) and C) B

Question 13

Which of the following techniques is used to collect fetal cells during pregnancy for genetic testing?

Accepted Answer

A)   testcross
B)   dihybrid cross
C)   amniocentesis
D)   pedigree analysisE) C) and D)
F) B) and C)

Question 14

Please refer to the following art to answer the following question(s) .
 
-In the accompanying art you see a table with the actual number of offspring that resulted from a dihybrid cross.The numbers do not show the 9:3:3:1 ratio predicted.One phenotype occurred more than predicted; another occurred less.The reason could be because ______.

Accepted Answer

A)   of errors in mitosis
B)   some of the alleles were linked
C)   some of the alleles were sex-linked
D)   of polygenic inheritanceE) A) and D)
F) All of the above

Question 15

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The F1 plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F1 × F1 cross?

Accepted Answer

A)   1:2:1
B)   2:1
C)   3:1
D)   9:3:3:1E) B) and D)
F) All of the above

Question 16

Please read the following scenario to answer the following question(s) .
Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family's history using pedigree analysis. The pedigree shown here shows three generations of a family. Notice that some individuals (shown in gray)  have a widow's peak (W = dominant allele and w = recessive allele) .
 
-Mary has the genotype ______.

Accepted Answer

A)   WW
B)   ww
C)   Ww
D)   more information is needed.E) A) and B)
F) A) and D)

Question 17

Which of these crosses will only produce heterozygous offspring?

Accepted Answer

A)   AA × aa
B)   AA × Aa
C)   Aa × Aa
D)   Aa × aaE) None of the above
F) C) and D)

Question 18

An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair. What is the relationship between the alleles for hair texture?

Accepted Answer

A)   pleiotropy
B)   incomplete dominance
C)   wavy hair is dominant to both straight and curly hair
D)   codominanceE) All of the above
F) None of the above

Question 19

According to Mendel's law of segregation,______.

Accepted Answer

A)   two alleles segregate into each gamete
B)   more gametes carrying the dominant allele are produced than gametes carrying the recessive allele
C)   gametes have one copy of each allele
D)   gametes are diploidE) B) and C)
F) All of the above

Question 20

What is the basis of Mendel's laws?

Accepted Answer

A)   the behavior of chromosomes during prophase I of meiosis only
B)   the behavior of chromosomes during mitotic anaphase
C)   the behavior of chromosomes during prophase I and prophase II of meiosis
D)   the behavior of chromosomes during metaphase I and anaphase I of meiosisE) A) and B)
F) A) and C)

Exam 9: Patterns of Inheritance

What is the key to the recognition of incomplete dominance?

Correct Answer
verified

Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Correct Answer
verified

Marfan syndrome is the result of inheriting a single allele. Individuals with Marfan syndrome are tall and long-limbed,and have both cardiovascular and eye defects. The inheritance of Marfan syndrome is an example of ______.

Correct Answer
verified

Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Correct Answer
verified

The ______ is most commonly found in nature.

Correct Answer
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Mendel crossed purebred purple-flowered plants with purebred white-flowered plants,and all of the resulting offspring produced purple flowers.The offspring are all ,and the allele for purple flowers is .

Correct Answer
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An individual who is homozygous ______.

Correct Answer
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C

Alleles are described as ______.

Correct Answer
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C

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The seeds of all of the offspring are yellow.Why?

Correct Answer
verified

Round seeds (R) are dominant to wrinkled seeds (r) ,and yellow seeds (Y) are dominant to green seeds (y) . What is the expected phenotypic ratio of a cross between an RrYy and an rryy individual?

Correct Answer
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To determine the phenotype of an individual who expresses a dominant trait,you would cross that individual with an individual who ______.

Correct Answer
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Correct Answer
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B

Which of the following techniques is used to collect fetal cells during pregnancy for genetic testing?

Correct Answer
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Correct Answer
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A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The F₁ plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F₁ × F₁ cross?

Correct Answer
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Correct Answer
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Which of these crosses will only produce heterozygous offspring?

Correct Answer
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An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair. What is the relationship between the alleles for hair texture?

Correct Answer
verified

According to Mendel's law of segregation,______.

Correct Answer
verified

What is the basis of Mendel's laws?

Correct Answer
verified

Exam 9: Patterns of Inheritance

What is the key to the recognition of incomplete dominance?

Correct AnswerverifiedShow Answer

Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Correct AnswerverifiedShow Answer

Marfan syndrome is the result of inheriting a single allele. Individuals with Marfan syndrome are tall and long-limbed,and have both cardiovascular and eye defects. The inheritance of Marfan syndrome is an example of ______.

Correct AnswerverifiedShow Answer

Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Correct AnswerverifiedShow Answer

The ______ is most commonly found in nature.

Correct AnswerverifiedShow Answer

Mendel crossed purebred purple-flowered plants with purebred white-flowered plants,and all of the resulting offspring produced purple flowers.The offspring are all ______,and the allele for purple flowers is ______.

Correct AnswerverifiedShow Answer

An individual who is homozygous ______.

Correct AnswerverifiedC

Alleles are described as ______.

Correct AnswerverifiedC

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The seeds of all of the offspring are yellow.Why?

Correct AnswerverifiedShow Answer

Round seeds (R) are dominant to wrinkled seeds (r) ,and yellow seeds (Y) are dominant to green seeds (y) . What is the expected phenotypic ratio of a cross between an RrYy and an rryy individual?

Correct AnswerverifiedShow Answer

To determine the phenotype of an individual who expresses a dominant trait,you would cross that individual with an individual who ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedB

Which of the following techniques is used to collect fetal cells during pregnancy for genetic testing?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The F1 plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F1 × F1 cross?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of these crosses will only produce heterozygous offspring?

Correct AnswerverifiedShow Answer

An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair. What is the relationship between the alleles for hair texture?

Correct AnswerverifiedShow Answer

According to Mendel's law of segregation,______.

Correct AnswerverifiedShow Answer

What is the basis of Mendel's laws?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Mendel crossed purebred purple-flowered plants with purebred white-flowered plants,and all of the resulting offspring produced purple flowers.The offspring are all ,and the allele for purple flowers is .

Correct Answer
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Correct Answer
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C

Correct Answer
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C

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Correct Answer
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Correct Answer
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Correct Answer
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B

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Correct Answer
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A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The F₁ plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F₁ × F₁ cross?

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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