Question 1

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the first parent?

Accepted Answer

A)  AA
B)  Aa
C)  aa
D)  The answer cannot be determined from this information.E) C) and D)
F) A) and C)

Question 2

When an individual of African descent marries and has children with an individual of European descent their children often have a mid shade of skin color.This can best be described as ___________.

Accepted Answer

A)  X-linked inheritance
B)  polygenic inheritance
C)  pleiotropic inheritance
D)  the dominance of the gene for dark skin toneE) B) and C)
F) A) and B)

Question 3

Each gamete carries one factor,now called an allele,for each inherited trait.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following disorders is not a X-linked trait?

Accepted Answer

A)  hemophilia
B)  Muscular dystrophy
C)  Adrenoleukodystrophy
D)  All of these are X-linked disordersE) A) and D)
F) None of the above

Question 5

Which of the following crosses would always result in offspring that only display the dominant phenotype?

Accepted Answer

A)  TT x tt
B)  Tt x Tt
C)  TT x TT
D)  Tt x tt
E)  Two of the crosses will always display the dominant phenotypeF) A) and D)
G) C) and E)

Question 6

Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive.Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes.Why?

Accepted Answer

A)  The lethal recessive gene may be incompletely dominant.
B)  Spreading the gene among offspring of both sexes will increase the likelihood it will be sex-linked and expressed.
C)  The selective-mating of closely related individuals,or inbreeding,increases chances that two recessive genes will "meet" in offspring.
D)  "Pleiotropy" - the gene that is being selected for this trait may have the second effect of being lethal.
E)  "Epistasis" - selection for the desired trait may result in "uncovering" the lethal gene.F) A) and D)
G) C) and D)

Question 7

Which of the following scenarios would not have been used by Mendel during his research?

Accepted Answer

A)  relied on his memory to remember his data
B)  followed the scientific method when designing his experiments
C)  used a statistic analysis to determine if his data was valid
D)  researched multiple generations of pea plants to help derive his conclusionsE) A) and B)
F) A) and C)

Question 8

During Mendel's pea plants experiment he discovered that the trait for tallness is dominant to that of shortness.Which of the following statements is correct?

Accepted Answer

A)  Tall = TT or Tt while short = tt
B)  Tall = TT or tt while short = Tt
C)  Tall = tt while short = TT or Tt
D)  None of these statements are correct.E) A) and D)
F) A) and C)

Question 9

If individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype,what would be the logical 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 correctF) All of the above
G) D) and E)

Question 10

Pleiotropy typically

Accepted Answer

A)  causes various symptoms to appear even though it only impacts a single gene.
B)  causes a single symptom to appear even though it only impacts a single gene.
C)  causes various symptoms to appear even though it only impacts multiple genes.
D)  causes a single symptom to appear even though it only impacts multiple genes.E) A) and B)
F) All of the above

Question 11

If the parents are AO and BO genotypes for the ABO blood group,their children could include which of the following genotypes?

Accepted Answer

A)  AO and BO only
B)  AO,BO,and AB only
C)  AA,BB,and AB only
D)  AO,BO,and OO only
E)  AO,BO,AB,and OO onlyF) A) and B)
G) A) and C)

Question 12

Polygenic traits such as height or weight are often influenced by the environment of the organism.

Accepted Answer

A) True 
 B)False

Question 13

A testcross involves an individual exhibiting the dominant phenotype but an unknown genotype being crossed with an individual that has a(n) ___________ genotype.

Accepted Answer

A)  homozygous dominant
B)  heterozygous dominant
C)  homozygous recessive
D)  any of the choicesE) None of the above
F) C) and D)

Question 14

Which is NOT true according to Mendel's law of segregation?

Accepted Answer

A)  Each individual contains two factors for each trait.
B)  One factor must be dominant and one factor recessive in each individual.
C)  Factors separate from each other during gamete formation.
D)  Each gamete contains one copy of each factor.
E)  Fertilization restores the presence of two factors.F) A) and B)
G) A) and C)

Question 15

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 D)
G) None of the above

Question 16

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) D) and E)
G) A) and E)

Question 17

If a woman is a carrier for the color-blind recessive allele and her husband is normal,what are their chances that a son will be color-blind?

Accepted Answer

A)  None since the father is normal.
B)  50% since the mother is the only carrier.
C)  100% because the mother has the gene.
D)  25% because the mother is a hybrid.
E)  None since he will also be just a carrier.F) All of the above
G) B) and C)

Question 18

If a pea plant shows a recessive phenotype,

Accepted Answer

A)  the genotype may be TT or Tt.
B)  the genotype may be Tt or tt.
C)  the genotype can only be TT.
D)  the genotype can only be tt.
E)  the genotype may be TT,Tt,or tt.F) C) and E)
G) A) and B)

Exam 11: Mendelian Patterns of Inheritance

Which of the following crosses would always result in offspring that only display the dominant phenotype?

Correct Answer
verified

Each gamete carries one factor,now called an allele,for each inherited trait.

Correct Answer
verified

When an individual of African descent marries and has children with an individual of European descent their children often have a mid shade of skin color.This can best be described as ___________.

Correct Answer
verified

Which of the following disorders is not a X-linked trait?

Correct Answer
verified

Which of the following scenarios would not have been used by Mendel during his research?

Correct Answer
verified

Polygenic traits such as height or weight are often influenced by the environment of the organism.

Correct Answer
verified

If a pea plant shows a recessive phenotype,

Correct Answer
verified

A testcross involves an individual exhibiting the dominant phenotype but an unknown genotype being crossed with an individual that has a(n) ___________ genotype.

Correct Answer
verified

Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive.Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes.Why?

Correct Answer
verified

Which is NOT true according to Mendel's law of segregation?

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

If individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype,what would be the logical genotype of the parents?

Correct Answer
verified

Correct Answer
verified

If the parents are AO and BO genotypes for the ABO blood group,their children could include which of the following genotypes?

Correct Answer
verified

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the first parent?

Correct Answer
verified

Pleiotropy typically

Correct Answer
verified

During Mendel's pea plants experiment he discovered that the trait for tallness is dominant to that of shortness.Which of the following statements is correct?

Correct Answer
verified

If a woman is a carrier for the color-blind recessive allele and her husband is normal,what are their chances that a son will be color-blind?

Correct Answer
verified

Exam 11: Mendelian Patterns of Inheritance

Which of the following crosses would always result in offspring that only display the dominant phenotype?

Correct AnswerverifiedShow Answer

Each gamete carries one factor,now called an allele,for each inherited trait.

Correct AnswerverifiedShow Answer

When an individual of African descent marries and has children with an individual of European descent their children often have a mid shade of skin color.This can best be described as ___________.

Correct AnswerverifiedShow Answer

Which of the following disorders is not a X-linked trait?

Correct AnswerverifiedShow Answer

Which of the following scenarios would not have been used by Mendel during his research?

Correct AnswerverifiedShow Answer

Polygenic traits such as height or weight are often influenced by the environment of the organism.

Correct AnswerverifiedShow Answer

If a pea plant shows a recessive phenotype,

Correct AnswerverifiedShow Answer

A testcross involves an individual exhibiting the dominant phenotype but an unknown genotype being crossed with an individual that has a(n) ___________ genotype.

Correct AnswerverifiedShow Answer

Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive.Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes.Why?

Correct AnswerverifiedShow Answer

Which is NOT true according to Mendel's law of segregation?

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

If individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype,what would be the logical genotype of the parents?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If the parents are AO and BO genotypes for the ABO blood group,their children could include which of the following genotypes?

Correct AnswerverifiedShow Answer

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the first parent?

Correct AnswerverifiedShow Answer

Pleiotropy typically

Correct AnswerverifiedShow Answer

During Mendel's pea plants experiment he discovered that the trait for tallness is dominant to that of shortness.Which of the following statements is correct?

Correct AnswerverifiedShow Answer

If a woman is a carrier for the color-blind recessive allele and her husband is normal,what are their chances that a son will be color-blind?

Correct AnswerverifiedShow Answer

Correct Answer
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