Question 1

Which allele combination represents a recessive individual?

Accepted Answer

A)  aa
B)  AA
C)  Aa
D)  None of these represent a recessive individualE) A) and C)
F) All of the above

Question 2

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _________ resulted in nondisjunction in __________.

Accepted Answer

A)  XXY; oogenesis
B)  XYY; spermatogenesis
C)  XXX; oogenesis
D)  XXY; spermatogenesis
E)  XO; oogenesisF) D) and E)
G) A) and B)

Question 3

The most common lethal genetic disease among Caucasians is

Accepted Answer

A)  neurofibromatosis.
B)  Tay-Sachs disease.
C)  phenylketonuria.
D)  albinism.
E)  cystic fibrosis.F) A) and D)
G) D) and E)

Question 4

Which is associated with the inability to produce factor VIII in the blood?

Accepted Answer

A)  Williams syndrome
B)  trisomy 21
C)  color-blindness
D)  Hemophilia A
E)  Duchenne muscular dystrophyF) B) and E)
G) C) and D)

Question 5

In pea plants,the gene for round seed (R) is dominant,and wrinkled seeds (r) are recessive.The endosperm of the pea is also either starchy,a dominant gene (S) ,or waxy (s) .What can be said of a fully heterozygous,dihybrid cross?

Accepted Answer

A)  It is impossible to secure offspring that are homozygous for both dominant genes.
B)  It is impossible to secure offspring that are homozygous for both recessive genes.
C)  It is impossible to secure offspring that are homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene.
D)  All of these choices are impossible combinations in a dihybrid cross.
E)  All of these choices are possible combinations in a dihybrid cross.F) A) and B)
G) B) and C)

Question 6

In a classic Mendelian monohybrid cross between a homozygous dominant parent and a homozygous recessive parent,which generation is always completely heterozygous?

Accepted Answer

A)  F1 generation
B)  F2 generation
C)  F3 generation
D)  P generationE) B) and D)
F) A) and B)

Question 7

The pedigree chart depicts the inheritance pattern of ____.Circles depict females and squares depict males.Colored shapes represent affected individuals (expressing a trait) and uncolored shapes are unaffected (do not express a trait) .

Accepted Answer

A)  an autosomal recessive characteristic with both parents being heterozygous
B)  an autosomal dominant characteristic with both parents being homozygous dominant
C)  an autosomal recessive characteristic with both parents being homozygous recessive
D)  none of the aboveE) B) and D)
F) C) and D)

Question 8

In a case of incomplete dominance,the phenotypic ratio of the F2 generation is the same as the genotypic ratio.

Accepted Answer

A) True 
 B)False

Question 9

In the use of a Punnett square for genetic results of crossing individuals

Accepted Answer

A)  all different kinds of sperm are lined up either horizontally or vertically.
B)  all different kinds of eggs are lined up either horizontally or vertically.
C)  the results show the offspring's expected genotypes.
D)  All of the choices are correct.
E)  Only two of the choices are correct.F) C) and D)
G) A) and B)

Question 10

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 made both homozygous and heterozygous carriers of sickle-cell undergo several generations of negative selection,and 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 C)
F) A) and D)

Question 11

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

Accepted Answer

A)  ww
B)  Ww
C)  WW
D)  CwE) C) and D)
F) None of the above

Question 12

Which occurrence is when an individual inherits a dominant gene but does not fully express the dominant phenotype?

Accepted Answer

A)  incomplete penetrance
B)  incomplete dominance
C)  polygenic inheritance
D)  pleiotropyE) All of the above
F) B) and C)

Question 13

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 is correct.E) B) and D)
F) All of the above

Question 14

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) A) and B)
F) B) and C)

Question 15

The reason why some individuals who inherit polydactyly (having an extra digit on the hand or feet) but do not express the trait is due to ________.

Accepted Answer

A)  incomplete penetrance
B)  incomplete dominance
C)  gene linkage
D)  pleiotropy
E)  none of the answers are correctF) B) and E)
G) B) and D)

Question 16

Which factor led to Mendel's success as a scientist?

Accepted Answer

A)  applied mathematics to the field of science
B)  followed the scientific method very closely
C)  kept detailed records of his research
D)  all of these factors made Mendel successfulE) A) and B)
F) A) and C)

Question 17

When crossing a true-breeding red snapdragon flower with a true-breeding white flower of the same species,we secure all pink offspring.This would seem to support the pre-Mendel view that inheritance is a blending of parental traits.However,Mendel and conventional wisdom agree that "blending" of parental traits is not correct and that particles of inheritance are actually involved because

Accepted Answer

A)  in the case of incomplete dominance,only radioactive isotope tracers can follow the actual hereditary particles
B)  under blending theory,over many generations only the average (or pink flowers) would remain; there would be no way to get back to pure red and white
C)  it is possible to cross the pink F-1 generation and secure a predictable proportion of pure red and white flowers again,which is not accounted for under the blending theory
D)  there is no way to directly prove incomplete dominance is not a case of blending,but we can be sure of genes because of the other cases of dominance,etc.,where genes are the only logical explanation.
E)  two of the above are trueF) A) and B)
G) A) and C)

Question 18

Women with X-linked disorders always pass the genes for the disorder to ______,while men with X-linked disorders always pass the genes for the disorder to _______.

Accepted Answer

A)  only their daughters; only their daughters
B)  both their daughters and sons; only their sons
C)  both their daughters and sons; only their daughters
D)  both their daughters and sons; their daughters and sonsE) B) and C)
F) A) and D)

Question 19

What are alleles?

Accepted Answer

A)  genes for different traits,such as hair color or eye color
B)  alternative forms of a gene for a single trait,such as blue eyes or brown eyes
C)  the locations of genes on a chromosome
D)  recessive forms of a kind of characteristic carried by genes
E)  dominant forms of a kind of characteristic carried by genesF) All of the above
G) A) and B)

Question 20

Which of the following reasons helped make Mendel successful with his genetic experiments?

Accepted Answer

A)  He had a strong background in mathematics
B)  He was very deliberate and followed the scientific method closely while doing his research
C)  He kept very detailed records of his research
D)  He was basing his research off of preexisting research
E)  All are reasons Mendel was successful with his genetic experimentsF) B) and C)
G) None of the above

Exam 11: Mendelian Patterns of Inheritance

The reason why some individuals who inherit polydactyly (having an extra digit on the hand or feet) but do not express the trait is due to ________.

Correct Answer
verified

In pea plants,the gene for round seed (R) is dominant,and wrinkled seeds (r) are recessive.The endosperm of the pea is also either starchy,a dominant gene (S) ,or waxy (s) .What can be said of a fully heterozygous,dihybrid cross?

Correct Answer
verified

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

Correct Answer
verified

Women with X-linked disorders always pass the genes for the disorder to ,while men with X-linked disorders always pass the genes for the disorder to _.

Correct Answer
verified

Which factor led to Mendel's success as a scientist?

Correct Answer
verified

Which is associated with the inability to produce factor VIII in the blood?

Correct Answer
verified

Correct Answer
verified

The pedigree chart depicts the inheritance pattern of ____.Circles depict females and squares depict males.Colored shapes represent affected individuals (expressing a trait) and uncolored shapes are unaffected (do not express a trait) .

Correct Answer
verified

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

In a classic Mendelian monohybrid cross between a homozygous dominant parent and a homozygous recessive parent,which generation is always completely heterozygous?

Correct Answer
verified

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 recessive individual?

Correct Answer
verified

Which of the following reasons helped make Mendel successful with his genetic experiments?

Correct Answer
verified

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _ resulted in nondisjunction in __.

Correct Answer
verified

In a case of incomplete dominance,the phenotypic ratio of the F₂ generation is the same as the genotypic ratio.

Correct Answer
verified

What are alleles?

Correct Answer
verified

The most common lethal genetic disease among Caucasians is

Correct Answer
verified

Which occurrence is when an individual inherits a dominant gene but does not fully express the dominant phenotype?

Correct Answer
verified

In the use of a Punnett square for genetic results of crossing individuals

Correct Answer
verified

Exam 11: Mendelian Patterns of Inheritance

The reason why some individuals who inherit polydactyly (having an extra digit on the hand or feet) but do not express the trait is due to ________.

Correct AnswerverifiedShow Answer

In pea plants,the gene for round seed (R) is dominant,and wrinkled seeds (r) are recessive.The endosperm of the pea is also either starchy,a dominant gene (S) ,or waxy (s) .What can be said of a fully heterozygous,dihybrid cross?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Women with X-linked disorders always pass the genes for the disorder to ______,while men with X-linked disorders always pass the genes for the disorder to _______.

Correct AnswerverifiedShow Answer

Which factor led to Mendel's success as a scientist?

Correct AnswerverifiedShow Answer

Which is associated with the inability to produce factor VIII in the blood?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The pedigree chart depicts the inheritance pattern of ____.Circles depict females and squares depict males.Colored shapes represent affected individuals (expressing a trait) and uncolored shapes are unaffected (do not express a trait) .

Correct AnswerverifiedShow 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

In a classic Mendelian monohybrid cross between a homozygous dominant parent and a homozygous recessive parent,which generation is always completely heterozygous?

Correct AnswerverifiedShow Answer

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 recessive individual?

Correct AnswerverifiedShow Answer

Which of the following reasons helped make Mendel successful with his genetic experiments?

Correct AnswerverifiedShow Answer

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _________ resulted in nondisjunction in __________.

Correct AnswerverifiedShow Answer

In a case of incomplete dominance,the phenotypic ratio of the F2 generation is the same as the genotypic ratio.

Correct AnswerverifiedShow Answer

What are alleles?

Correct AnswerverifiedShow Answer

The most common lethal genetic disease among Caucasians is

Correct AnswerverifiedShow Answer

Which occurrence is when an individual inherits a dominant gene but does not fully express the dominant phenotype?

Correct AnswerverifiedShow Answer

In the use of a Punnett square for genetic results of crossing individuals

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Women with X-linked disorders always pass the genes for the disorder to ,while men with X-linked disorders always pass the genes for the disorder to _.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _ resulted in nondisjunction in __.

Correct Answer
verified

In a case of incomplete dominance,the phenotypic ratio of the F₂ generation is the same as the genotypic ratio.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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