Question 1

A testcross is a mating of an individual with an unknown genotype and an individual that

Accepted Answer

A)   is homozygous dominant.
B)   has a known genotype.
C)   is homozygous recessive.
D)   is a wild-type.
E)   is heterozygous.F) B) and D)
G) C) and D)

Question 2

If you cross RrYy and RRyy pea plants,what percentage of the offspring will have round yellow peas? R = round,r = wrinkled,Y = yellow,y = green.

Accepted Answer

A)   25%
B)   75%
C)   50%
D)   100%
E)   0%F) All of the above
G) A) and C)

Question 3

Figuer:
In these data, the parental generation characteristics (resistant or susceptible)  are shown at top. 
-What did the researchers conclude from the data shown in the figure?

Accepted Answer

A)   Resistance to Bt toxin is dominant.
B)   Resistance to Bt toxin is recessive.
C)   The size of larvae is dependent on treatment with Bt toxin.
D)   Resistance to Bt toxin is not genetic.
E)   The number of larvae is dependent on treatment with Bt toxin.F) C) and D)
G) A) and C)

Question 4

When a farmer grows cotton containing the gene for Bt toxin,insects that are resistant (rr) survive and reproduce.This is an example of

Accepted Answer

A)   genetic drift.
B)   dominance.
C)   natural selection.
D)   independent assortment.
E)   recombination.F) A) and D)
G) A) and C)

Question 5

Diagrams of gene order and spacing on chromosomes are

Accepted Answer

A)   metabolic maps.
B)   karyotypes.
C)   linkage maps.
D)   genotypes.
E)   phenotypes.F) A) and B)
G) D) and E)

Question 6

If the heterozygous phenotype is intermediate between those of the two different homozygotes,this is called

Accepted Answer

A)   epistasis.
B)   incomplete dominance.
C)   independent assortment.
D)   polygenic.
E)   codominance.F) D) and E)
G) B) and C)

Question 7

A physician reports to you the lab results in identifying your genetic condition relating to your skin health."DNA fingerprint" information indicates that you have two different versions of the allele for a particular skin protein,and this is called

Accepted Answer

A)   heterozygous.
B)   dominant.
C)   recessive.
D)   homozygous.
E)   homologous.F) All of the above
G) A) and B)

Question 8

When a farmer grows cotton containing the gene for Bt toxin,they often leave a strip of non-Bt cotton around the outside of the field for what reason?

Accepted Answer

A)   because the non-Bt cotton grows better
B)   because the non-Bt cotton does not drive the moths and caterpillars to extinction
C)   to allow the non-Bt and Bt cotton plants to cross pollinate
D)   to allow some rr bollworm caterpillars to survive
E)   to allow some RR bollworm caterpillars to survive and limit selection pressure for resistanceF) D) and E)
G) None of the above

Question 9

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R = round,r = wrinkled,Y = yellow,y = green.

Accepted Answer

A)   0%
B)   100%
C)   25%
D)   75%
E)   50%F) C) and D)
G) A) and D)

Question 10

Which gametes can a RrYy plant produce?

Accepted Answer

A)   RY, Ry, rY, or ry
B)   Rr or Yy
C)   RY or ry
D)   R or r
E)   RrYyF) B) and D)
G) A) and E)

Question 11

In pedigree charts,autosomal dominant disorders typically

Accepted Answer

A)   appear only in females.
B)   seem to disappear in one generation, only to reappear in the next generation.
C)   occur every third generation.
D)   appear in every generation.
E)   appear only in males.F) All of the above
G) A) and B)

Question 12

X-linked recessive disorders affect more females than males.

Accepted Answer

A) True 
 B)False

Question 13

If you cross two pea plants,one with green peas and the other with yellow peas,you find all of the offspring have yellow peas.You conclude the yellow parent was

Accepted Answer

A)   heterozygous.
B)   homozygous for the recessive gene.
C)   homozygous for the dominant gene.
D)   homozygous for the dominant allele.
E)   homozygous for the recessive allele.F) None of the above
G) A) and B)

Question 14

Having the alleles Tt is

Accepted Answer

A)   a loci.
B)   linkage.
C)   a genotype.
D)   a phenotype.
E)   a gene.F) A) and D)
G) A) and E)

Question 15

A healthy young couple are both carriers of cystic fibrosis; the chance that each of their future children will inherit this serious illness is

Accepted Answer

A)   More information is needed about the couple's parents and grandparents to determine probability.
B)   25%.
C)   0%, because cystic fibrosis is not an inherited illness.
D)   50%.
E)   100%, because both parents are identified as carriers of cystic fibrosis.F) A) and B)
G) A) and D)

Question 16

When a farmer grows cotton containing the gene for Bt toxin,insects that are resistant (rr) survive and reproduce.These insects were resistant because

Accepted Answer

A)   the insects were able to produce gametes that were resistant to the insecticide.
B)   they inherited the alleles that made them resistant.
C)   the insecticide caused mutations to generate resistant alleles.
D)   the insects wanted to survive the insecticide and mutated their DNA.
E)   by random chance some insects did not die from the insecticide.F) C) and E)
G) A) and D)

Question 17

Gametes may carry different combinations of alleles because of

Accepted Answer

A)   random fertilization and crossing over.
B)   random fertilization.
C)   random fertilization and alignment of chromosomes.
D)   crossing over and random alignment of chromosomes.
E)   random alignment of chromosomes.F) A) and E)
G) A) and D)

Question 18

A dihybrid cross is a mating between two individuals that are each ______________ for ___________ gene (genes) .

Accepted Answer

A)   heterozygous; two
B)   homologous; two
C)   homozygous; one
D)   homozygous; two
E)   heterozygous; oneF) A) and E)
G) B) and C)

Question 19

Females who are carriers for hemophilia

Accepted Answer

A)   theoretically pass the allele for hemophilia to half of their daughters.
B)   All of the answer choices are correct.
C)   theoretically pass the allele for hemophilia to half of their offspring.
D)   usually do not show any symptoms of hemophilia.
E)   theoretically pass the allele for hemophilia to half of their sons.F) B) and E)
G) All of the above

Question 20

Adult female bollworm moths lay eggs on cotton bolls.These eggs then hatch,and grow into caterpillars that eat the seeds of the boll.Eggs and sperm would be produced by

Accepted Answer

A)   mitosis.
B)   fertilization.
C)   meiosis.
D)   translocation.
E)   crossing over.F) B) and E)
G) A) and E)

Exam 10: Patterns of Inheritance

A healthy young couple are both carriers of cystic fibrosis; the chance that each of their future children will inherit this serious illness is

Correct AnswerverifiedShow Answer

In pedigree charts,autosomal dominant disorders typically

Correct AnswerverifiedShow Answer

If you cross RrYy and RRyy pea plants,what percentage of the offspring will have round yellow peas? R = round,r = wrinkled,Y = yellow,y = green.

Correct AnswerverifiedShow Answer

A physician reports to you the lab results in identifying your genetic condition relating to your skin health."DNA fingerprint" information indicates that you have two different versions of the allele for a particular skin protein,and this is called

Correct AnswerverifiedShow Answer

Diagrams of gene order and spacing on chromosomes are

Correct AnswerverifiedShow Answer

If you cross two pea plants,one with green peas and the other with yellow peas,you find all of the offspring have yellow peas.You conclude the yellow parent was

Correct AnswerverifiedShow Answer

Females who are carriers for hemophilia

Correct AnswerverifiedShow Answer

A dihybrid cross is a mating between two individuals that are each ______________ for ___________ gene (genes) .

Correct AnswerverifiedShow Answer

Adult female bollworm moths lay eggs on cotton bolls.These eggs then hatch,and grow into caterpillars that eat the seeds of the boll.Eggs and sperm would be produced by

Correct AnswerverifiedShow Answer

Having the alleles Tt is

Correct AnswerverifiedShow Answer

When a farmer grows cotton containing the gene for Bt toxin,insects that are resistant (rr) survive and reproduce.This is an example of

Correct AnswerverifiedShow Answer

A testcross is a mating of an individual with an unknown genotype and an individual that

Correct AnswerverifiedShow Answer

When a farmer grows cotton containing the gene for Bt toxin,they often leave a strip of non-Bt cotton around the outside of the field for what reason?

Correct AnswerverifiedShow Answer

Gametes may carry different combinations of alleles because of

Correct AnswerverifiedShow Answer

Figuer: In these data, the parental generation characteristics (resistant or susceptible) are shown at top. -What did the researchers conclude from the data shown in the figure?

Correct AnswerverifiedShow Answer

When a farmer grows cotton containing the gene for Bt toxin,insects that are resistant (rr) survive and reproduce.These insects were resistant because

Correct AnswerverifiedShow Answer

X-linked recessive disorders affect more females than males.

Correct AnswerverifiedShow Answer

If the heterozygous phenotype is intermediate between those of the two different homozygotes,this is called

Correct AnswerverifiedShow Answer

Which gametes can a RrYy plant produce?

Correct AnswerverifiedShow Answer

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R = round,r = wrinkled,Y = yellow,y = green.

Correct AnswerverifiedShow Answer

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A dihybrid cross is a mating between two individuals that are each ____ for _ gene (genes) .

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