Question 1

Which of the following crosses will NOT produce offspring with the recessive phenotype? Select all that apply.

Accepted Answer

A)  TT × Tt
B)  Tt × Tt
C)  TT × TT
D)  Tt × tt
E)  tt × ttF) A) and B)
G) B) and C) A,C

Question 2

If black fur is produced by a recessive allele,which genotype is most likely to produce a black individual?

Accepted Answer

A)  bb
B)  BB
C)  Bb
D)  CbE) C) and D)
F) A) and B)

Question 3

If individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype,which of the following could be the genotype of the parents?

Accepted Answer

A)  Both are homozygous recessive.
B)  One is heterozygous and one is homozygous dominant.
C)  Both are homozygous dominant.
D)  Both are heterozygous.
E)  Two of the options may be correct.F) None of the above
G) All of the above

Question 4

Create a pedigree chart that depicts an inheritance pattern of an autosomal dominant characteristic.Use circles to depict females and squares to depict males.Colored shapes represent affected individuals (expressing a trait)and uncolored shapes are unaffected (do not express a trait).

Accepted Answer

Answers may vary.This figure depicts the...

Question 5

If a human who is a tongue roller (T) and has unattached ear lobes (E) marries a person who cannot roll their tongue and has attached earlobes,could they produce an offspring that was also a non-tongue-roller with attached earlobes? What would be the genotype of the first parent? The second parent?

Accepted Answer

A)  yes; TtEe; ttee
B)  yes; TtEE; ttEe
C)  no; TTEE; ttee
D)  unable to determine from the information givenE) C) and D)
F) A) and B)

Question 6

If two parents have blood genotypes IAi and IBi,which of the following blood genotypes are possible in their children?

Accepted Answer

A)  IAi and IBi only
B)  IAi,IBi,and IAIB only
C)  IAIA,IBIB,and IAIB only
D)  IAi,IBi,and ii only
E)  IAi,IBi,IAIB and iiF) A) and C)
G) A) and E)

Question 7

Black and brown guinea pigs are bred together.Assuming their color is determined by one gene,and that there is a dominant and a recessive allele,how would you determine which allele is dominant? How could you determine the genotypes of the parents? Explain.

Accepted Answer

Answers may vary. Situation 1: If both p...

Question 8

Haiti is settled by peoples of both African and European ancestry.A young couple,both with mixed ancestry,marry and have several children.The children,who all have equal exposure to sunlight,vary widely in the amount of skin melanin.One child is lighter than both parents,and one is darker.The simple explanation for this is

Accepted Answer

A)  epistasis.
B)  multiple alleles are available for the one chromosomal locus that governs skin color.
C)  the environment influenced the phenotypes of the children.
D)  polygenic inheritance.
E)  gene linkage.F) D) and E)
G) None of the above

Question 9

The particulate theory of inheritance

Accepted Answer

A)  preceded Mendel's research by a century.
B)  was proposed by Mendel.
C)  is based on particles or hereditary units we now call genes.
D)  All of the choices are correct.
E)  Two of the above choices are correct.F) None of the above
G) A) and E)

Question 10

What aspect of Mendel's background gave him the necessary tools to discover the laws of inheritance?

Accepted Answer

A)  He was a monk.
B)  He was a teacher.
C)  He lived in Austria.
D)  He had studied mathematics and probability.
E)  He corresponded with Charles Darwin.F) B) and C)
G) All of the above

Question 11

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

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 recessive,and one homozygous dominant is a likely outcome,but all heterozygous,or two,three,or all four homozygous are also possible.F) A) and C)
G) A) and E)

Question 12

Some plants fail to produce chlorophyll,and this trait appears to be recessive.Many plants also self-pollinate.If we locate a pea plant that is heterozygous for this trait,self-pollinate it and harvest seeds,what are the likely phenotypes of these seeds when they germinate?

Accepted Answer

A)  All will be green with chlorophyll.
B)  All will be white and lack chlorophyll.
C)  About one-half will be green and one-half white.
D)  About one-fourth will be white and three-fourths green.
E)  About one-fourth will be green and three-fourths white.F) B) and D)
G) C) and D)

Question 13

What is pleiotropy?

Accepted Answer

A)  A single mutant gene affects two or more distinct and seemingly unrelated traits.
B)  A single mutant gene affects one trait.
C)  Two mutant genes affect one trait.
D)  A single mutant gene has no effect on an individual's phenotype.E) A) and B)
F) A) and C)

Question 14

As many as 60% of people in malaria-infected regions of Africa have the sickle-cell allele,but only about 10% of the U.S.population of African ancestry carries the allele.Malaria remains a major disease in central Africa but has not been a serious problem in the U.S.for many generations.What is/are the reason(s) for the difference in the percentages and what is a reasonable statement about future percentages?

Accepted Answer

A)  The presence of malaria in Africa maintains the advantage of the heterozygous sickle-cell trait,and the prevalence of malaria will likely continue to preserve the 60% rate.
B)  The U.S.percentage may have always been somewhat lower due to immigration from nonmalaria regions,but changes in sites and rates of immigration could occur.
C)  Lack of widespread malaria in the United States would have resulted in both homozygous and heterozygous carriers of sickle cell undergoing several generations of negative selection.We should expect this to continue unless innovative therapies give all individuals an equal chance of surviving and reproducing.
D)  All of the choices are reasonable.E) A) and B)
F) None of the above

Question 15

If white eyes are produced by a recessive allele,what is the likely genotype of a white-eyed individual?

Accepted Answer

A)  rr
B)  Rr
C)  RR
D)  RBE) B) and C)
F) All of the above A

Question 16

The ability to roll the edges of the tongue upward in a U-shape is considered to be an inherited trait.The standard assumption is that tongue-rolling is a dominant allele at a single gene locus.Which of the following would cast doubt on this assumption? Select all that apply.

Accepted Answer

A)  A student who can roll his tongue has both a mother and father who cannot.
B)  In a large research study,the majority of tongue-rollers were male.
C)  A research study with 1,000 participants reports that most non-tongue-rollers can learn to roll their tongues.
D)  A student who cannot roll his tongue has both a mother and father who can.E) All of the above
F) A) and D)

Question 17

If the probability of event A is 3/4 and the probability of event B is 1/4,then the probability of both A and B occurring at the same time is

Accepted Answer

A)  3/4.
B)  1/4.
C)  1 or absolute certainty.
D)  1/2.
E)  3/16.F) A) and B)
G) B) and E)

Question 18

In what kind of classic Mendelian cross would you expect to find a ratio of 9:3:3:1 among the F2 offspring?

Accepted Answer

A)  monohybrid cross
B)  dihybrid cross
C)  testcross
D)  None of the choices are correct.E) B) and D)
F) None of the above

Question 19

Which allele combination represents a heterozygous individual?

Accepted Answer

A)  aa
B)  AA
C)  Aa
D)  None of these represent a heterozygous individual.E) All of the above
F) A) and D)

Question 20

The offspring of a monohybrid testcross could have what possible genotype(s) ?

Accepted Answer

A)  AA and Aa
B)  Aa and aa
C)  AA,Aa,and aa
D)  AA only
E)  aa onlyF) A) and B)
G) A) and C) B

Exam 11: Mendelian Patterns of Inheritance

Which of the following crosses will NOT produce offspring with the recessive phenotype? Select all that apply.

Correct Answer
verified
A,C

If black fur is produced by a recessive allele,which genotype is most likely to produce a black individual?

Correct Answer
verified

If individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype,which of the following could be the genotype of the parents?

Correct Answer
verified

Create a pedigree chart that depicts an inheritance pattern of an autosomal dominant characteristic.Use circles to depict females and squares to depict males.Colored shapes represent affected individuals (expressing a trait)and uncolored shapes are unaffected (do not express a trait).

Correct Answer
verified
Answers may vary.This figure depicts the...
View Answer

If a human who is a tongue roller (T) and has unattached ear lobes (E) marries a person who cannot roll their tongue and has attached earlobes,could they produce an offspring that was also a non-tongue-roller with attached earlobes? What would be the genotype of the first parent? The second parent?

Correct Answer
verified

If two parents have blood genotypes I^Ai and I^Bi,which of the following blood genotypes are possible in their children?

Correct Answer
verified

Black and brown guinea pigs are bred together.Assuming their color is determined by one gene,and that there is a dominant and a recessive allele,how would you determine which allele is dominant? How could you determine the genotypes of the parents? Explain.

Correct Answer
verified
Answers may vary. Situation 1: If both p...
View Answer

Correct Answer
verified

The particulate theory of inheritance

Correct Answer
verified

What aspect of Mendel's background gave him the necessary tools to discover the laws of inheritance?

Correct Answer
verified

Correct Answer
verified

Some plants fail to produce chlorophyll,and this trait appears to be recessive.Many plants also self-pollinate.If we locate a pea plant that is heterozygous for this trait,self-pollinate it and harvest seeds,what are the likely phenotypes of these seeds when they germinate?

Correct Answer
verified

What is pleiotropy?

Correct Answer
verified

Correct Answer
verified

If white eyes are produced by a recessive allele,what is the likely genotype of a white-eyed individual?

Correct Answer
verified
A

The ability to roll the edges of the tongue upward in a U-shape is considered to be an inherited trait.The standard assumption is that tongue-rolling is a dominant allele at a single gene locus.Which of the following would cast doubt on this assumption? Select all that apply.

Correct Answer
verified

If the probability of event A is 3/4 and the probability of event B is 1/4,then the probability of both A and B occurring at the same time is

Correct Answer
verified

In what kind of classic Mendelian cross would you expect to find a ratio of 9:3:3:1 among the F₂ offspring?

Correct Answer
verified

Which allele combination represents a heterozygous individual?

Correct Answer
verified

The offspring of a monohybrid testcross could have what possible genotype(s) ?

Correct Answer
verified
B

Exam 11: Mendelian Patterns of Inheritance

Which of the following crosses will NOT produce offspring with the recessive phenotype? Select all that apply.

Correct AnswerverifiedA,C

If black fur is produced by a recessive allele,which genotype is most likely to produce a black individual?

Correct AnswerverifiedShow Answer

If individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype,which of the following could be the genotype of the parents?

Correct AnswerverifiedShow Answer

Create a pedigree chart that depicts an inheritance pattern of an autosomal dominant characteristic.Use circles to depict females and squares to depict males.Colored shapes represent affected individuals (expressing a trait)and uncolored shapes are unaffected (do not express a trait).

Correct AnswerverifiedAnswers may vary.This figure depicts the...View AnswerShow Answer

If a human who is a tongue roller (T) and has unattached ear lobes (E) marries a person who cannot roll their tongue and has attached earlobes,could they produce an offspring that was also a non-tongue-roller with attached earlobes? What would be the genotype of the first parent? The second parent?

Correct AnswerverifiedShow Answer

If two parents have blood genotypes IAi and IBi,which of the following blood genotypes are possible in their children?

Correct AnswerverifiedShow Answer

Black and brown guinea pigs are bred together.Assuming their color is determined by one gene,and that there is a dominant and a recessive allele,how would you determine which allele is dominant? How could you determine the genotypes of the parents? Explain.

Correct AnswerverifiedAnswers may vary. Situation 1: If both p...View AnswerShow Answer

Correct AnswerverifiedShow Answer

The particulate theory of inheritance

Correct AnswerverifiedShow Answer

What aspect of Mendel's background gave him the necessary tools to discover the laws of inheritance?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Some plants fail to produce chlorophyll,and this trait appears to be recessive.Many plants also self-pollinate.If we locate a pea plant that is heterozygous for this trait,self-pollinate it and harvest seeds,what are the likely phenotypes of these seeds when they germinate?

Correct AnswerverifiedShow Answer

What is pleiotropy?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If white eyes are produced by a recessive allele,what is the likely genotype of a white-eyed individual?

Correct AnswerverifiedA

The ability to roll the edges of the tongue upward in a U-shape is considered to be an inherited trait.The standard assumption is that tongue-rolling is a dominant allele at a single gene locus.Which of the following would cast doubt on this assumption? Select all that apply.

Correct AnswerverifiedShow Answer

If the probability of event A is 3/4 and the probability of event B is 1/4,then the probability of both A and B occurring at the same time is

Correct AnswerverifiedShow Answer

In what kind of classic Mendelian cross would you expect to find a ratio of 9:3:3:1 among the F2 offspring?

Correct AnswerverifiedShow Answer

Which allele combination represents a heterozygous individual?

Correct AnswerverifiedShow Answer

The offspring of a monohybrid testcross could have what possible genotype(s) ?

Correct AnswerverifiedB

Correct Answer
verified
A,C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Answers may vary.This figure depicts the...
View Answer

Correct Answer
verified

If two parents have blood genotypes I^Ai and I^Bi,which of the following blood genotypes are possible in their children?

Correct Answer
verified

Correct Answer
verified
Answers may vary. Situation 1: If both p...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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A

Correct Answer
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Correct Answer
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In what kind of classic Mendelian cross would you expect to find a ratio of 9:3:3:1 among the F₂ offspring?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B