Question 1

Which of the following is an example of sex- limited inheritance?

Accepted Answer

A)  hemophilia
B)  hair color in humans
C)  beard formation in humans
D)  cat fur length
E)  human baldnessF) A) and E)
G) A) and B)

Question 2

A condition in which one gene pair masks the expression of a nonallelic gene pair is called________  .

Accepted Answer

A)  recessiveness
B)  additive alleles
C)  codominance
D)  dominance
E)  epistasisF) B) and C)
G) C) and D)

Question 3

The following coat colors are known to be determined by alleles at one locus in horses: palomino = golden coat with lighter mane and tail cremello = almost white chestnut = brown
The following table gives ratios obtained in matings of the above varieties: 1C1 = chestnut,C2C2 = cremello,C1C2 = palomino B) C1C1 = cremello,C2C2 = chestnut,C1C2 = palomino C) C1C1 = palomino,C2C2 = chestnut,C1C2 = cremello D) C1C1 = chestnut,C2C2 = palomino,C1C2 = cremello E) C1C1 = palomino,C2C2 = cremello,C1C2 = chestnut" class="answers-bank-image d-inline" rel="preload" > Assign gene symbols for the genetic control of coat color on the basis of these data.

Accepted Answer

A)  C1C1 = chestnut,C2C2 = cremello,C1C2 = palomino
B)  C1C1 = cremello,C2C2 = chestnut,C1C2 = palomino
C)  C1C1 = palomino,C2C2 = chestnut,C1C2 = cremello
D)  C1C1 = chestnut,C2C2 = palomino,C1C2 = cremello
E)  C1C1 = palomino,C2C2 = cremello,C1C2 = chestnutF) None of the above
G) A) and B)

Question 4

Which of the following is true about X- linkage?

Accepted Answer

A)  One result of X- linkage is a crisscross pattern of inheritance in which daughters express recessive genes of their fathers and sons express recessive genes of their mothers.
B)  X linkage demonstrates that only the wild- type allele is the dominant allele.
C)  Females will only express dominant alleles.
D)  Males are more liable to express recessive alleles as they are hemizygous.
E)  One result of X- linkage is a crisscross pattern of inheritance in which sons express recessive genes of their fathers and daughters express recessive genes of their mothers.F) A) and D)
G) A) and C)

Question 5

Two forms of hemophilia are determined by genes on the X chromosome in humans.Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man.What is the probability that their first daughter will have hemophilia?

Accepted Answer

A)  1/3
B)  zero
C)  1/4
D)  1/2
E)  100%F) All of the above
G) A) and B)

Question 6

With ________ ,there will be more than two genetic alternatives for a given locus.

Accepted Answer

A)  incomplete dominance
B)  codominance
C)  gain of function mutant
D)  epistasis
E)  multiple allelesF) A) and B)
G) A) and C)

Question 7

Which of the following is an example of codominance?

Accepted Answer

A)  a scorpion's venom is more potent when it's younger
B)  in roan cattle,you can see a mix or both red and white furs
C)  flowers of a certain plant can come in purple,blue,or yellow
D)  there are many possible mutations that lead to white eyes in flies
E)  a certain plant can have jagged,rough,or smooth edges on its leavesF) A) and B)
G) A) and C) B

Question 8

Assume that a cross is made between two organisms that are both heterozygous for a gene that shows incomplete dominance.What phenotypic and genotypic ratios are expected in the offspring?

Accepted Answer

A)  phenotypic 1:2:1; genotypic 1:2:1
B)  phenotypic 1:1:1:1; genotypic 1:2:1
C)  phenotypic 1:2:1; genotypic 1:1:1:1
D)  phenotypic 1:2:1; genotypic 1:3
E)  phenotypic 3:1; genotypic 1:2:1F) A) and B)
G) C) and E)

Question 9

The following F2 results occur from a typical dihybrid cross: 2 results occur from a typical dihybrid cross:   If a double heterozygote AaBb is crossed with a fully recessive organism aabb,what phenotypic ratio is expected in the offspring? A) 9 purple : 7 white B) 1 purple : 3 white C) 1 purple : 1 white D) 12 purple : 4 white E) 3 purple : 1 white" class="answers-bank-image d-inline" rel="preload" > If a double heterozygote AaBb is crossed with a fully recessive organism aabb,what phenotypic ratio is expected in the offspring?

Accepted Answer

A)  9 purple : 7 white
B)  1 purple : 3 white
C)  1 purple : 1 white
D)  12 purple : 4 white
E)  3 purple : 1 whiteF) B) and C)
G) None of the above

Question 10

A mutant gene that produces brown eyes bw is located on chromosome #2 of Drosophila melanogaster,whereas a mutant gene producing bright red eyes,scarlet st ,is located on chromosome #3.Phenotypically,wild- type flies with dull red eyes ,whose mothers had brown eyes and whose fathers had scarlet eyes,were mated.The 800 offspring possessed the following phenotypes: wild type dull red ,white,scarlet bright red) ,and brown.Most of the 800 offspring had wild- type eyes,whereas those with white eyes were the least frequent. From the information presented above,how many white- eyed flies would you expect in the F2 generation?

Accepted Answer

A)  200
B)  450
C)  350
D)  50
E)  150F) D) and E)
G) None of the above

Question 11

The trait of medium- sized leaves in iris is determined by the genetic condition PP'.Plants with large leaves are PP,whereas plants with small leaves are P'P'.A cross is made between two plants each with medium- sized leaves.What is the term for this allelic relationship?

Accepted Answer

A)  positional effect
B)  codominance
C)  epistasis
D)  incomplete dominance
E)  multiple allelesF) C) and D)
G) D) and E) D

Question 12

Assume that a dihybrid cross AaBb × AaBb is made in which the gene loci are autosomal,independently assorting,and incompletely dominant.What phenotypic ratio would you expect from such a cross?

Accepted Answer

A)  1:2:1:2:4:2:1:2:1
B)  1:2:2:1:4:2:1:2:1
C)  2:1:1:2:2:1:4:2:2
D)  2:2:2:2:2:2:2:2
E)  1:2:1:2:2:2:1:4:1F) A) and D)
G) D) and E)

Question 13

The ABO blood group locus in humans provides an example of ________ .

Accepted Answer

A)  conditional alleles
B)  epistasis
C)  auxotrophy
D)  incomplete dominance
E)  multiple allelesF) B) and C)
G) B) and D)

Question 14

With which of the following would hemizygosity most likely be associated?

Accepted Answer

A)  incomplete dominance
B)  sex- limited inheritance
C)  X- linked inheritance
D)  codominance
E)  trihybrid crossesF) C) and D)
G) All of the above C

Question 15

When two squash plants with disc- shaped fruit are crossed,depending on the genotype of the parents,disc,sphere,and long fruits may be seen in the offspring.This is an example of ________ .

Accepted Answer

A)  two gene interaction with novel phenotypes
B)  dominant lethal
C)  heterogenous trait
D)  complementation
E)  epistasisF) A) and B)
G) A) and C)

Question 16

A snapdragon plant has red,pink,or white flowers,inherited in an incomplete dominance pattern.It can come in tall or dwarf homozygous recessive varieties.What is the ratio expected if you cross a pink tall heterozygous plant with a pink short plant?

Accepted Answer

A)  1 red tall : 1 red short : 2 pink tall : 2 pink short : 1 white tall : 1 white short
B)  2 red tall : 2 red short : 1 pink tall : 1 pink short : 1 white tall : 1 white short
C)  1 red tall : 1 red short : 1 pink tall : 1 pink short : 1 white tall : 1 white short
D)  3 red tall : 3 red short : 1 white tall : 1 white short
E)  2 red tall : 1 red short : 1 pink tall : 1 pink short : 2 white tall : 1 white shortF) A) and E)
G) None of the above

Question 17

A mutation in a gene often results in a reduction of the product of that gene.The term for this type of mutation is ________.

Accepted Answer

A)  incomplete dominance
B)  loss of function or null in the case of complete loss 
C)  codominance
D)  multiple allelism
E)  gain of functionF) A) and C)
G) A) and B)

Question 18

Which of the following crosses would indicate that the mutants were in the same complementation group?

Accepted Answer

A)  red eye fly × red eye fly -> 3 : 1 ratio
B)  pink eye fly × pink eye fly -> purple eye flies
C)  pink eye fly × pink eye fly -> pink eye fly
D)  pink eye fly × pink eye fly -> all white eye offspring
E)  pink eye fly × white eye fly -> all white eyesF) B) and E)
G) C) and D)

Question 19

Typical ratios resulting from epistatic interactions in dihybrid crosses would be________  .

Accepted Answer

A)  9:3:3:1,1:2:1
B)  1:2:2:4:1:2:1:2:1,1:2:1
C)  9:3:4,9:7
D)  1:1:1:1,1:4:6:4:1
E)  3:1,1:1F) All of the above
G) C) and E)

Question 20

A ________ ratio indicates incomplete dominance.

Accepted Answer

A)  1:2:1
B)  2:2:2
C)  9:7
D)  3:1
E)  1:1:1:1F) B) and C)
G) B) and E)

Exam 4: Extensions of Mendelian Genetics

Which of the following is an example of sex- limited inheritance?

Correct Answer
verified

A condition in which one gene pair masks the expression of a nonallelic gene pair is called________ .

Correct Answer
verified

Correct Answer
verified

Which of the following is true about X- linkage?

Correct Answer
verified

Two forms of hemophilia are determined by genes on the X chromosome in humans.Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man.What is the probability that their first daughter will have hemophilia?

Correct Answer
verified

With ________ ,there will be more than two genetic alternatives for a given locus.

Correct Answer
verified

Which of the following is an example of codominance?

Correct Answer
verified
B

Assume that a cross is made between two organisms that are both heterozygous for a gene that shows incomplete dominance.What phenotypic and genotypic ratios are expected in the offspring?

Correct Answer
verified

The following F₂results occur from a typical dihybrid cross: If a double heterozygote AaBb is crossed with a fully recessive organism aabb,what phenotypic ratio is expected in the offspring?

Correct Answer
verified

Correct Answer
verified

The trait of medium- sized leaves in iris is determined by the genetic condition PP'.Plants with large leaves are PP,whereas plants with small leaves are P'P'.A cross is made between two plants each with medium- sized leaves.What is the term for this allelic relationship?

Correct Answer
verified
D

Assume that a dihybrid cross AaBb × AaBb is made in which the gene loci are autosomal,independently assorting,and incompletely dominant.What phenotypic ratio would you expect from such a cross?

Correct Answer
verified

The ABO blood group locus in humans provides an example of ________ .

Correct Answer
verified

With which of the following would hemizygosity most likely be associated?

Correct Answer
verified
C

When two squash plants with disc- shaped fruit are crossed,depending on the genotype of the parents,disc,sphere,and long fruits may be seen in the offspring.This is an example of ________ .

Correct Answer
verified

A snapdragon plant has red,pink,or white flowers,inherited in an incomplete dominance pattern.It can come in tall or dwarf homozygous recessive varieties.What is the ratio expected if you cross a pink tall heterozygous plant with a pink short plant?

Correct Answer
verified

A mutation in a gene often results in a reduction of the product of that gene.The term for this type of mutation is ________.

Correct Answer
verified

Which of the following crosses would indicate that the mutants were in the same complementation group?

Correct Answer
verified

Typical ratios resulting from epistatic interactions in dihybrid crosses would be________ .

Correct Answer
verified

A ________ ratio indicates incomplete dominance.

Correct Answer
verified

Exam 4: Extensions of Mendelian Genetics

Which of the following is an example of sex- limited inheritance?

Correct AnswerverifiedShow Answer

A condition in which one gene pair masks the expression of a nonallelic gene pair is called________ .

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is true about X- linkage?

Correct AnswerverifiedShow Answer

Two forms of hemophilia are determined by genes on the X chromosome in humans.Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man.What is the probability that their first daughter will have hemophilia?

Correct AnswerverifiedShow Answer

With ________ ,there will be more than two genetic alternatives for a given locus.

Correct AnswerverifiedShow Answer

Which of the following is an example of codominance?

Correct AnswerverifiedB

Assume that a cross is made between two organisms that are both heterozygous for a gene that shows incomplete dominance.What phenotypic and genotypic ratios are expected in the offspring?

Correct AnswerverifiedShow Answer

The following F2 results occur from a typical dihybrid cross: If a double heterozygote AaBb is crossed with a fully recessive organism aabb,what phenotypic ratio is expected in the offspring?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The trait of medium- sized leaves in iris is determined by the genetic condition PP'.Plants with large leaves are PP,whereas plants with small leaves are P'P'.A cross is made between two plants each with medium- sized leaves.What is the term for this allelic relationship?

Correct AnswerverifiedD

Assume that a dihybrid cross AaBb × AaBb is made in which the gene loci are autosomal,independently assorting,and incompletely dominant.What phenotypic ratio would you expect from such a cross?

Correct AnswerverifiedShow Answer

The ABO blood group locus in humans provides an example of ________ .

Correct AnswerverifiedShow Answer

With which of the following would hemizygosity most likely be associated?

Correct AnswerverifiedC

When two squash plants with disc- shaped fruit are crossed,depending on the genotype of the parents,disc,sphere,and long fruits may be seen in the offspring.This is an example of ________ .

Correct AnswerverifiedShow Answer

A snapdragon plant has red,pink,or white flowers,inherited in an incomplete dominance pattern.It can come in tall or dwarf homozygous recessive varieties.What is the ratio expected if you cross a pink tall heterozygous plant with a pink short plant?

Correct AnswerverifiedShow Answer

A mutation in a gene often results in a reduction of the product of that gene.The term for this type of mutation is ________.

Correct AnswerverifiedShow Answer

Which of the following crosses would indicate that the mutants were in the same complementation group?

Correct AnswerverifiedShow Answer

Typical ratios resulting from epistatic interactions in dihybrid crosses would be________ .

Correct AnswerverifiedShow Answer

A ________ ratio indicates incomplete dominance.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

The following F₂results occur from a typical dihybrid cross: If a double heterozygote AaBb is crossed with a fully recessive organism aabb,what phenotypic ratio is expected in the offspring?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified