Question 1

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. 
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.

Question 2

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. 
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.

Question 3

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. 
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.

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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. 
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.

Question 6

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

Question 7

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. 
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.

Question 8

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 phenotype 
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 phenotype

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 correct 
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

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 conclusions 
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 conclusions

Question 12

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

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 choices 
A) homozygous dominant 
B) heterozygous dominant 
C) homozygous recessive 
D) any of the choices

Question 14

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 only 
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 only

Question 15

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. 
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.

Question 16

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

Question 17

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. 
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.

Question 18

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 disorders 
A) hemophilia 
B) Muscular dystrophy 
C) Adrenoleukodystrophy 
D) All of these are X-linked disorders

Exam 11: Mendelian Patterns of Inheritance

If a pea plant shows a recessive phenotype,

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?

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

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

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?

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

Pleiotropy typically

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

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?

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

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

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?

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

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

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?

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 ___________.

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

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