Question 1

In a Punnett square,

Accepted Answer

A) all the possible types of sperm are lined up either horizontally or vertically. 
B) all the possible types 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. 
A) all the possible types of sperm are lined up either horizontally or vertically. 
B) all the possible types 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.

Question 2

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.

Question 3

An individual with blood type A marries an individual with blood type B.
A.What blood types could their offspring exhibit?
B.Provide the possible genotypes of parents and offspring produced.
C.What pattern of inheritance is this?

Accepted Answer

A.The offspring could have Blood Types A

Question 4

What is the blending theory of inheritance?

Accepted Answer

A) Mendel's theory of how traits are passed from parent to offspring. 
B) Darwin's theory of how traits are passed from the parent to the offspring. 
C) The modern theory of how genetic information is passed from parents to offspring. 
D) A theory that describes how offspring show traits intermediate between those of the parents. 
A) Mendel's theory of how traits are passed from parent to offspring. 
B) Darwin's theory of how traits are passed from the parent to the offspring. 
C) The modern theory of how genetic information is passed from parents to offspring. 
D) A theory that describes how offspring show traits intermediate between those of the parents.

Question 5

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

Accepted Answer

A) None since the father is normal. 
B) 50% since the mother is a carrier. 
C) 100% because the mother is a carrier. 
D) None since he will be a carrier like his mother. 
A) None since the father is normal. 
B) 50% since the mother is a carrier. 
C) 100% because the mother is a carrier. 
D) None since he will be a carrier like his mother.

Question 6

The most common lethal genetic disease among Caucasians is

Accepted Answer

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

Question 7

Which allele combination represents a homozygous dominant individual?

Accepted Answer

A) AA 
B) Aa 
C) aa 
D) None of these are homozygous dominant individuals. 
A) AA 
B) Aa 
C) aa 
D) None of these are homozygous dominant individuals.

Question 8

During what stage of meiosis does independent assortment occur? What is segregation and when does it occur in meiosis? How do these processes affect the gametes formed during meiosis? Explain.

Accepted Answer

In metaphase I of meiosis,homologous chr

Question 9

Women with an X-linked disorder could pass the genes for the disorder to ________,and men with an X-linked disorder could 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 sons 
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 sons

Question 10

Upon examination,a person is found to only have half the normal number of LDL-cholesterol receptors.Which of the following best explains this?

Accepted Answer

A) pleiotropic inheritance 
B) polygenic inheritance 
C) incomplete dominance 
D) X-linked inheritance 
A) pleiotropic inheritance 
B) polygenic inheritance 
C) incomplete dominance 
D) X-linked inheritance

Question 11

Why did Mendel choose pea plants for his research?

Accepted Answer

A) Peas are easy to cultivate. 
B) Pea plants have a short generation time. 
C) Pea plants are self-pollinating but can be cross-fertilized easily. 
D) Many true-breeding varieties were available. 
E) All of these were important characteristics in Mendel's selection. 
A) Peas are easy to cultivate. 
B) Pea plants have a short generation time. 
C) Pea plants are self-pollinating but can be cross-fertilized easily. 
D) Many true-breeding varieties were available. 
E) All of these were important characteristics in Mendel's selection.

Question 12

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 13

Computer simulations are sometimes used to demonstrate the outcome of monohybrid fruit fly crosses,where a student can run generation after generation of fruit flies with 100 offspring produced each generation,half male and half female,and a 3-to-1 phenotype ratio (or 75 to 25)in the F1 generation.Compared with real genetics results,

Accepted Answer

A) rarely would exactly 100 fly offspring be produced or survive. 
B) an exact balance between males and females would be rare. 
C) a precise 3-to-1 ratio would be uncommon. 
D) All of the choices are true. 
A) rarely would exactly 100 fly offspring be produced or survive. 
B) an exact balance between males and females would be rare. 
C) a precise 3-to-1 ratio would be uncommon. 
D) All of the choices are true.

Question 14

Which statement about the blending concept of inheritance is correct?

Accepted Answer

A) A cross between a tall man and a short woman would always produce children of medium height. 
B) A cross between a tall man and a short woman can produce some children that are tall while others are short. 
C) A cross between a tall man and a short woman produces tall children who can then produce short grandchildren. 
D) Genetic material is unstable which accounts for such a wide diversity in our offspring. 
A) A cross between a tall man and a short woman would always produce children of medium height. 
B) A cross between a tall man and a short woman can produce some children that are tall while others are short. 
C) A cross between a tall man and a short woman produces tall children who can then produce short grandchildren. 
D) Genetic material is unstable which accounts for such a wide diversity in our offspring.

Question 15

The reason why some individuals who inherit polydactyly (having an extra digit on the hand or feet)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 correct. 
A) incomplete penetrance. 
B) incomplete dominance. 
C) gene linkage. 
D) pleiotropy. 
E) None of the answers are correct.

Question 16

If an individual is heterozygous for a particular trait,the gametes that individual produces will contain 3/4 dominant and 1/4 recessive alleles.

Accepted Answer

A) True 
 B)False

Question 17

In pea plants,the gene for round seeds (R)is dominant,and wrinkled seeds (r)is 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) Some offspring could be homozygous for both dominant genes. 
B) Some offspring could be homozygous for both recessive genes. 
C) Some offspring could be 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. 
A) Some offspring could be homozygous for both dominant genes. 
B) Some offspring could be homozygous for both recessive genes. 
C) Some offspring could be 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.

Question 18

When crossing a true-breeding red snapdragon flower with a true-breeding white flower of the same species,all offspring are pink.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.Which of the following statements supports the idea of particulate inheritance? Select all that apply.

Accepted Answer

A) Two parents that show the incompletely dominant phenotype produce some offspring that are red and some that are white. 
B) Over many generations of crossing individuals with the incompletely dominant phenotype,all the progeny are pink. 
C) There is no way to directly prove that incomplete dominance is not a case of blending. 
D) In meiosis,alleles of different genes assort independently of each other during gamete formation. 
A) Two parents that show the incompletely dominant phenotype produce some offspring that are red and some that are white. 
B) Over many generations of crossing individuals with the incompletely dominant phenotype,all the progeny are pink. 
C) There is no way to directly prove that incomplete dominance is not a case of blending. 
D) In meiosis,alleles of different genes assort independently of each other during gamete formation.

Question 19

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 20

Cystic fibrosis and phenylketonuria are common autosomal dominant disorders.

Accepted Answer

A) True 
 B)False

Exam 11: Mendelian Patterns of Inheritance

In a Punnett square,

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

An individual with blood type A marries an individual with blood type B. A.What blood types could their offspring exhibit? B.Provide the possible genotypes of parents and offspring produced. C.What pattern of inheritance is this?

What is the blending theory of inheritance?

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

The most common lethal genetic disease among Caucasians is

Which allele combination represents a homozygous dominant individual?

During what stage of meiosis does independent assortment occur? What is segregation and when does it occur in meiosis? How do these processes affect the gametes formed during meiosis? Explain.

Women with an X-linked disorder could pass the genes for the disorder to ________,and men with an X-linked disorder could pass the genes for the disorder to ________.

Upon examination,a person is found to only have half the normal number of LDL-cholesterol receptors.Which of the following best explains this?

Why did Mendel choose pea plants for his research?

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

Which statement about the blending concept of inheritance is correct?

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

If an individual is heterozygous for a particular trait,the gametes that individual produces will contain 3/4 dominant and 1/4 recessive alleles.

In pea plants,the gene for round seeds (R)is dominant,and wrinkled seeds (r)is 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?

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?

Cystic fibrosis and phenylketonuria are common autosomal dominant disorders.

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Filters

Women with an X-linked disorder could pass the genes for the disorder to ,and men with an X-linked disorder could pass the genes for the disorder to .

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