Question 1

Mendel's Law of Segregation is supported by a __________ testcross ratio.

Accepted Answer

A)  2:1
B)  5:2
C)  3:2
D)  1:1
E)  3:1F) A) and D)
G) B) and E)

Question 2

Two organisms,AABBCCDDEE and aabbccddee.,are mated to produce an F1 that is self- fertilized.If the capital letters represent dominant,independently assorting alleles.How many different genotypes will occur in the F2?

Accepted Answer

A)  25
B)  32
C)  1024
D)  64
E)  243F) A) and B)
G) A) and C)

Question 3

Assume that you have a garden and some pea plants have solid leaves and others have striped leaves.You conduct a series of crosses [a) through e) ] and obtain the results given in the table.Define gene symbols and give the possible genotypes of the parents of cross E.

Accepted Answer

A)  solid is dominant to striped SS × ss
B)  solid is dominant to striped Ss × ss
C)  solid is dominant to striped Ss × Ss
D)  striped is dominant to solid SS × ss
E)  striped is dominant to solid Ss × ssF) A) and D)
G) A) and E)

Question 4

You have identified a plant in your garden with a new flower color.You want to determine if this phenotype is dominant or recessive.Which cross would tell you this?

Accepted Answer

A)  crossing the plant to one you know has the recessive trait
B)  selfing the plant
C)  crossing the plant to a plant of the same type of any color
D)  sequencing the DNA for the trait
E)  crossing the new plant to one you know has the dominant traitF) A) and B)
G) C) and D)

Question 5

If an F2 generation from a self- cross always yields offspring in a 3:1 phenotypic ratio,which of the following P crosses could have occurred?

Accepted Answer

A)  AA × aa
B)  aa × aa
C)  AA × AA
D)  aa × Aa
E)  Aa × AAF) A) and B)
G) D) and E)

Question 6

Assuming complete dominance,a phenotypic ratio of __________is expected from a monohybrid sib or self- cross.

Accepted Answer

A)  5:2
B)  2:1
C)  3:2
D)  3:1
E)  1:1F) C) and D)
G) A) and D)

Question 7

Under what conditions does one expect a 9:3:3:1 ratio?

Accepted Answer

A)  monohybrid cross F2 with independently assorting,completely dominant genes
B)  dihybrid test cross F2 with independently assorting,completely dominant genes
C)  dihybrid cross F2 with independently assorting,completely dominant genes
D)  dihybrid cross F1 with independently assorting,completely dominant genes
E)  monohybrid test cross F2 with independently assorting,completely dominant genesF) C) and E)
G) All of the above

Question 8

A cross between two individuals with different phenotypes that resulted in approximately 50% of each type of offspring would indicate the cross was__________ .

Accepted Answer

A)  a heterozygous dominant crossed to a heterozygous recessive
B)  a homozygous recessive crossed to a heterozygous recessive
C)  true breeding dominant to recessive
D)  true dominant to a heterozygous dominant
E)  a heterozygous dominant crossed to a homozygous recessiveF) A) and E)
G) C) and D)

Question 9

Tightly curled hair is caused by a dominant autosomal gene in humans.If a heterozygous curly- haired person marries a person with straight hair,what phenotypes and in what proportions are expected in the offspring?

Accepted Answer

A)  2 curly : 1 straight
B)  1 curly : 1 straight
C)  1 curly : 3 straight
D)  1 curly : 2 straight
E)  3 curly : 1 straightF) B) and C)
G) A) and B)

Question 10

Tightly curled or wooly hair is caused by a dominant gene in humans.If a heterozygous curly- haired person marries a person with straight hair,what percentage of their offspring would be expected to have straight hair?

Accepted Answer

A)  25% curly
B)  100% straight
C)  75% curly
D)  50% straight
E)  It is impossible to predict the outcome.F) A) and D)
G) A) and C)

Question 11

Albinism,lack of pigmentation in humans,results from an autosomal recessive gene a .Two parents with normal pigmentation have an albino child.What is the probability that their next child will be an albino girl?

Accepted Answer

A)  1/4
B)  3/4
C)  1/8
D)  1/2
E)  1/3F) None of the above
G) A) and B) C

Question 12

In a Chi- square analysis,what general condition causes one to reject fail to accept the null hypothesis?

Accepted Answer

A)  usually when the probability value is less than 0.5
B)  when observed = expected
C)  usually when the probability value is less than 0.05
D)  when observed >> expected
E)  usually when the probability value is less than 0.005F) A) and C)
G) A) and E)

Question 13

Assuming independent assortment,what proportion of the offspring of the cross AaBbCcDd × AabbCCdd will have the aabbccdd genotype?

Accepted Answer

A)  1/64
B)  1/256
C)  1/512
D)  1/1024
E)  0%F) B) and D)
G) B) and C)

Question 14

Which types of phenotypic ratios are likely to occur in crosses when dealing with three gene pairs for which all the genotypic combinations are of equal viability?

Accepted Answer

A)  2:3,1:2
B)  1:4:6:4:1,1:1:1:1
C)  1:2:1,3:1
D)  27:9:9:9:3:3:3:1
E)  12:3:1,9:7F) B) and E)
G) C) and E) D

Question 15

According to Charles Darwin and Alfred Wallace,variations followed a more continuous pattern.According to Mendel's model,variation due to dominance- recessive relationships followed a more __________ form.

Accepted Answer

A)  normalized
B)  transferred
C)  abstract
D)  smooth
E)  discontinuousF) All of the above
G) A) and B)

Question 16

Name the single individual whose work in the mid- 1800s contributed to our understanding of the particulate nature of inheritance as well as the basic genetic transmission patterns.With what organism did this person work?

Accepted Answer

A)  Gregor Mendel; ,Pisum sativum
B)  Calvin Bridges; Drosophila
C)  George Beadle; Neurospora
D)  Boris Ephrussi; Ephestia
E)  Thomas Hunt Morgan; DrosophilaF) A) and E)
G) A) and B)

Question 17

Mendel crossed two pea plants with round seeds.All seeds of the offspring were round.He then crossed a plant with round seeds to a plant with wrinkled seeds and all offspring had wrinkled seeds.Which of the following is true?

Accepted Answer

A)  wrinkled is dominant
B)  the plants he used were not true breeding
C)  a mutation occurred
D)  the trait does not breed true
E)  round is dominantF) A) and C)
G) B) and E)

Question 18

Under what conditions does one expect a 1:1:1:1 ratio?

Accepted Answer

A)  AaBb × aabb
B)  AaBb × AaBb
C)  Aabb × AABB
D)  AABB × aabb
E)  AAbb × aaBBF) A) and E)
G) All of the above A

Question 19

The autosomal not X- linked gene for brachydactyly,short fingers,is dominant to normal finger length.Assume that a female with brachydactyly in the heterozygous condition is married to a man with normal fingers.What is the probability that their first child will be a brachydactylous girl?

Accepted Answer

A)  1/2
B)  2/3
C)  3/4
D)  1/4
E)  1/8F) B) and D)
G) A) and C)

Question 20

What meiotic process,relative to the number of chromosomes of a given species,accounts for a significant amount of genetic variation in gametes?

Accepted Answer

A)  bivalent formation
B)  pairing of homologous chromosomes
C)  independent assortment of chromosomes
D)  trivalent formation
E)  formation of the meiotic spindle during chromosome segregationF) A) and B)
G) A) and C)

Exam 3: Mendelian Genetics

Mendel's Law of Segregation is supported by a __________ testcross ratio.

Correct AnswerverifiedShow Answer

Two organisms,AABBCCDDEE and aabbccddee.,are mated to produce an F1 that is self- fertilized.If the capital letters represent dominant,independently assorting alleles.How many different genotypes will occur in the F2?

Correct AnswerverifiedShow Answer

Assume that you have a garden and some pea plants have solid leaves and others have striped leaves.You conduct a series of crosses [a) through e) ] and obtain the results given in the table.Define gene symbols and give the possible genotypes of the parents of cross E.

Correct AnswerverifiedShow Answer

You have identified a plant in your garden with a new flower color.You want to determine if this phenotype is dominant or recessive.Which cross would tell you this?

Correct AnswerverifiedShow Answer

If an F2 generation from a self- cross always yields offspring in a 3:1 phenotypic ratio,which of the following P crosses could have occurred?

Correct AnswerverifiedShow Answer

Assuming complete dominance,a phenotypic ratio of __________is expected from a monohybrid sib or self- cross.

Correct AnswerverifiedShow Answer

Under what conditions does one expect a 9:3:3:1 ratio?

Correct AnswerverifiedShow Answer

A cross between two individuals with different phenotypes that resulted in approximately 50% of each type of offspring would indicate the cross was__________ .

Correct AnswerverifiedShow Answer

Tightly curled hair is caused by a dominant autosomal gene in humans.If a heterozygous curly- haired person marries a person with straight hair,what phenotypes and in what proportions are expected in the offspring?

Correct AnswerverifiedShow Answer

Tightly curled or wooly hair is caused by a dominant gene in humans.If a heterozygous curly- haired person marries a person with straight hair,what percentage of their offspring would be expected to have straight hair?

Correct AnswerverifiedShow Answer

Albinism,lack of pigmentation in humans,results from an autosomal recessive gene a .Two parents with normal pigmentation have an albino child.What is the probability that their next child will be an albino girl?

Correct AnswerverifiedC

In a Chi- square analysis,what general condition causes one to reject fail to accept the null hypothesis?

Correct AnswerverifiedShow Answer

Assuming independent assortment,what proportion of the offspring of the cross AaBbCcDd × AabbCCdd will have the aabbccdd genotype?

Correct AnswerverifiedShow Answer

Which types of phenotypic ratios are likely to occur in crosses when dealing with three gene pairs for which all the genotypic combinations are of equal viability?

Correct AnswerverifiedD

According to Charles Darwin and Alfred Wallace,variations followed a more continuous pattern.According to Mendel's model,variation due to dominance- recessive relationships followed a more __________ form.

Correct AnswerverifiedShow Answer

Name the single individual whose work in the mid- 1800s contributed to our understanding of the particulate nature of inheritance as well as the basic genetic transmission patterns.With what organism did this person work?

Correct AnswerverifiedShow Answer

Mendel crossed two pea plants with round seeds.All seeds of the offspring were round.He then crossed a plant with round seeds to a plant with wrinkled seeds and all offspring had wrinkled seeds.Which of the following is true?

Correct AnswerverifiedShow Answer

Under what conditions does one expect a 1:1:1:1 ratio?

Correct AnswerverifiedA

The autosomal not X- linked gene for brachydactyly,short fingers,is dominant to normal finger length.Assume that a female with brachydactyly in the heterozygous condition is married to a man with normal fingers.What is the probability that their first child will be a brachydactylous girl?

Correct AnswerverifiedShow Answer

What meiotic process,relative to the number of chromosomes of a given species,accounts for a significant amount of genetic variation in gametes?

Correct AnswerverifiedShow Answer

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C

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