Question 1

For Mendel's law of segregation to occur, the alleles must be

Accepted Answer

A)   at different loci on the same chromosome.
B)   at the same loci on the same chromosome.
C)   on a nonhomologous pair of chromosomes.
D)   on a homologous pair of chromosome at the same loci.
E)   on different loci on different chromosomes.F) C) and D)
G) A) and E)

Question 2

Unattached earlobes (EE or Ee)  are dominant over attached earlobes (ee) . A couple has unattached earlobes. Both notice that one of their parents on both sides have attached earlobes (ee) . Therefore, they correctly assume that they are carriers for attached earlobes (Ee) . If the couple proceeds to have four children, then

Accepted Answer

A)   they can be certain that three will be heterozygous and one homozygous recessive.
B)   if the first three are heterozygous, the fourth must be homozygous recessive.
C)   the children must repeat the grandparents' genotype (Ee) .
D)   all children must have unattached earlobes since both parents possess the dominant gene for it.
E)   two heterozygous, one homozygous dominant, and one homozygous recessive is a likely outcome, but all genotype ratios are possible.F) B) and E)
G) B) and D)

Question 3

Hydrangeas are flowering plants with large, showy blooms. When the plant is grown in alkaline soil, the flowers are pink. When the plant is grown in acidic soil, the flowers turn blue. This change is phenotype is an example of

Accepted Answer

A)   codominance.
B)   incomplete dominance.
C)   environmental influence.
D)   polygenic inheritance.
E)   epistatic interaction.F) A) and D)
G) B) and C)

Question 4

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of his traits. If blue eyes and left-handedness are recessive, how many different phenotypes are possible in their children?

Accepted Answer

A)   one
B)   two
C)   three
D)   four
E)   fiveF) B) and C)
G) None of the above

Question 5

You have two true-breeding rose bushes, one with red flowers and one with white flowers. A cross between these two roses yields a bush with pink flowers. The pink flower color is an example of

Accepted Answer

A)   codominance.
B)   incomplete dominance.
C)   environmental effects.
D)   polygenic inheritance.
E)   epistatic interaction.F) C) and E)
G) A) and B)

Question 6

The inheritance of blood types in humans can be explained by

Accepted Answer

A)   simple Mendelian genetics (one gene pair) .
B)   linked genes.
C)   simple dominance.
D)   multiple alleles.
E)   polygenic inheritance.F) A) and D)
G) C) and D)

Question 7

In the human population, short fingers are dominant over long fingers. Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

Accepted Answer

The female's genotype would be...

Question 8

In humans, widow's peak (W)  is dominant over straight hairline (w) . If a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?

Accepted Answer

A)   0%
B)   25%
C)   50%
D)   100%
E)   The answer cannot be determined by the information given.F) A) and B)
G) A) and C)

Question 9

A woman who can roll her tongue is married to a man who cannot. Two of their four children can roll their tongues and two cannot. If T = tongue rolling and t = cannot roll tongue, then what is the genotype of the parents?

Accepted Answer

A)   woman Tt; man Tt
B)   woman TT; man tt
C)   woman Tt; man TT
D)   woman Tt; man tt
E)   woman tt; man ttF) A) and B)
G) B) and D)

Question 10

Which of the following produces an intermediate phenotype?

Accepted Answer

A)   codominance
B)   sex-linked inheritance
C)   polygenic inheritance
D)   simple Mendelian inheritance
E)   incomplete dominanceF) B) and D)
G) B) and E)

Question 11

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

Accepted Answer

A)   RRYY × RRYY
B)   RRYY × rryy
C)   RrYy × RrYy
D)   RrYy × rryy
E)   rryy × rryyF) B) and C)
G) C) and E)

Question 12

Due to a recessively inherited trait, some plants fail to produce chlorophyll and therefore are white rather than green. If we locate a pea plant that is heterozygous for this trait, self-pollinate it, harvest the seeds, and then plant the seeds, what are the likely phenotypes of the resulting offspring?

Accepted Answer

A)   100% green
B)   100% white
C)   approximately 1/2 green and 1/2 white
D)   approximately 1/4 white and 3/4 green
E)   approximately 1/4 green and 3/4 whiteF) A) and B)
G) A) and C)

Question 13

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

Accepted Answer

A)   phenylketonuria (PKU) 
B)   Marfan syndrome
C)   Huntington disease
D)   sickle cell disease
E)   cystic fibrosis (CF) F) C) and E)
G) A) and C)

Question 14

The genetic makeup of an individual is also known as their

Accepted Answer

A)   phenotype.
B)   loci.
C)   genotype.
D)   factors.E) B) and C)
F) A) and D)

Question 15

Which of the following is an autosomal dominant disorder?

Accepted Answer

A)   Marfan syndrome
B)   Tay-Sachs
C)   sickle cell disease
D)   cystic fibrosis (CF) 
E)   phenylketonuria (PKU) F) A) and D)
G) All of the above

Question 16

In humans, assume straight hairline is recessive to widow's peak. A woman with a straight hairline is married to a man with a widow's peak whose mother had a straight hairline. What are the chances of the couple having a child with a straight hairline?

Accepted Answer

A)   0%
B)   25%
C)   50%
D)   75%
E)   100%F) C) and D)
G) A) and B)

Question 17

Mendel's law of segregation implies that the two members of an allele pair

Accepted Answer

A)   are distributed to separate gametes.
B)   are distributed to the same gamete.
C)   are assorted dependently.
D)   are segregated pairwise.
E)   must always code for the identical trait or feature.F) A) and E)
G) C) and E)

Question 18

Which genetic disorder is associated with a defect in the elastic connective tissue protein called fibrillin?

Accepted Answer

A)   Marfan syndrome
B)   Huntington disease
C)   sickle cell disease
D)   phenylketonuria (PKU) 
E)   cystic fibrosis (CF) F) D) and E)
G) C) and D)

Question 19

Which allele combination represents a recessive monohybrid trait?

Accepted Answer

A)   aa
B)   Aa
C)   AA
D)   ab
E)   AbF) A) and B)
G) None of the above

Question 20

Indicate the genotypic and phenotypic ratios that you could expect if an individual who is heterozygous for Huntington disease has children with a normal individual.

Accepted Answer

The individual who is heterozygous for H...

Exam 23: Patterns of Gene Inheritance

The inheritance of blood types in humans can be explained by

Correct Answer
verified

In the human population, short fingers are dominant over long fingers. Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

Correct Answer
verified
The female's genotype would be...
View Answer

In humans, widow's peak (W) is dominant over straight hairline (w) . If a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?

Correct Answer
verified

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

Correct Answer
verified

In humans, assume straight hairline is recessive to widow's peak. A woman with a straight hairline is married to a man with a widow's peak whose mother had a straight hairline. What are the chances of the couple having a child with a straight hairline?

Correct Answer
verified

Mendel's law of segregation implies that the two members of an allele pair

Correct Answer
verified

Correct Answer
verified

Which allele combination represents a recessive monohybrid trait?

Correct Answer
verified

Which of the following produces an intermediate phenotype?

Correct Answer
verified

Which of the following is an autosomal dominant disorder?

Correct Answer
verified

For Mendel's law of segregation to occur, the alleles must be

Correct Answer
verified

Correct Answer
verified

You have two true-breeding rose bushes, one with red flowers and one with white flowers. A cross between these two roses yields a bush with pink flowers. The pink flower color is an example of

Correct Answer
verified

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

Correct Answer
verified

Which genetic disorder is associated with a defect in the elastic connective tissue protein called fibrillin?

Correct Answer
verified

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of his traits. If blue eyes and left-handedness are recessive, how many different phenotypes are possible in their children?

Correct Answer
verified

Indicate the genotypic and phenotypic ratios that you could expect if an individual who is heterozygous for Huntington disease has children with a normal individual.

Correct Answer
verified
The individual who is heterozygous for H...
View Answer

Hydrangeas are flowering plants with large, showy blooms. When the plant is grown in alkaline soil, the flowers are pink. When the plant is grown in acidic soil, the flowers turn blue. This change is phenotype is an example of

Correct Answer
verified

A woman who can roll her tongue is married to a man who cannot. Two of their four children can roll their tongues and two cannot. If T = tongue rolling and t = cannot roll tongue, then what is the genotype of the parents?

Correct Answer
verified

The genetic makeup of an individual is also known as their

Correct Answer
verified

Exam 23: Patterns of Gene Inheritance

The inheritance of blood types in humans can be explained by

Correct AnswerverifiedShow Answer

In the human population, short fingers are dominant over long fingers. Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

Correct AnswerverifiedThe female's genotype would be...View AnswerShow Answer

In humans, widow's peak (W) is dominant over straight hairline (w) . If a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?

Correct AnswerverifiedShow Answer

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

Correct AnswerverifiedShow Answer

In humans, assume straight hairline is recessive to widow's peak. A woman with a straight hairline is married to a man with a widow's peak whose mother had a straight hairline. What are the chances of the couple having a child with a straight hairline?

Correct AnswerverifiedShow Answer

Mendel's law of segregation implies that the two members of an allele pair

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which allele combination represents a recessive monohybrid trait?

Correct AnswerverifiedShow Answer

Which of the following produces an intermediate phenotype?

Correct AnswerverifiedShow Answer

Which of the following is an autosomal dominant disorder?

Correct AnswerverifiedShow Answer

For Mendel's law of segregation to occur, the alleles must be

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

You have two true-breeding rose bushes, one with red flowers and one with white flowers. A cross between these two roses yields a bush with pink flowers. The pink flower color is an example of

Correct AnswerverifiedShow Answer

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

Correct AnswerverifiedShow Answer

Which genetic disorder is associated with a defect in the elastic connective tissue protein called fibrillin?

Correct AnswerverifiedShow Answer

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of his traits. If blue eyes and left-handedness are recessive, how many different phenotypes are possible in their children?

Correct AnswerverifiedShow Answer

Indicate the genotypic and phenotypic ratios that you could expect if an individual who is heterozygous for Huntington disease has children with a normal individual.

Correct AnswerverifiedThe individual who is heterozygous for H...View AnswerShow Answer

Hydrangeas are flowering plants with large, showy blooms. When the plant is grown in alkaline soil, the flowers are pink. When the plant is grown in acidic soil, the flowers turn blue. This change is phenotype is an example of

Correct AnswerverifiedShow Answer

A woman who can roll her tongue is married to a man who cannot. Two of their four children can roll their tongues and two cannot. If T = tongue rolling and t = cannot roll tongue, then what is the genotype of the parents?

Correct AnswerverifiedShow Answer

The genetic makeup of an individual is also known as their

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
The female's genotype would be...
View Answer

Correct Answer
verified

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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Correct Answer
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Correct Answer
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Correct Answer
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The individual who is heterozygous for H...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified