Question 1

Mendel called a masking trait:

Accepted Answer

A)  Dominant
B)  Recessive
C)  Homologous
D)  Homozygous
E)  HeterozygousF) None of the above
G) C) and E)

Question 2

Any monohybrid cross consisting of one dominant and one recessive allele for the trait being studied should result in a ratio of ______________ dominant to __________________ recessive.

Accepted Answer

A)  Three, one
B)  One, one
C)  One, two
D)  Two, one
E)  One, threeF) C) and D)
G) B) and C)

Question 3

A Barr body is:

Accepted Answer

A)  An inactive Y chromosome
B)  An inactive autosome
C)  An active X chromosome
D)  An active Y chromosome
E)  An inactive X chromosomeF) C) and D)
G) B) and D)

Question 4

Recessive alleles seem to vanish in some generations and reappear in later generations because:

Accepted Answer

A)  They cannot be expressed in males
B)  They are masked by a dominant allele
C)  They cannot be expressed in females
D)  They cannot be expressed in successive generations
E)  They are lost by mutationF) C) and D)
G) C) and E)

Question 5

If an individual is heterozygous for a particular trait:

Accepted Answer

A)  Each parent contributed a different allele for that trait
B)  Each parent contributed the same allele for that trait
C)  One parent contributed two different alleles for that trait
D)  One parent contributed two copies of the same allele for that traitE) All of the above
F) None of the above

Question 6

A male expresses:

Accepted Answer

A)  Only the dominant alleles on his X chromosome
B)  Both the dominant and recessive alleles on his X chromosome
C)  Only the homozygous recessive alleles on his X chromosome
D)  None of the alleles on his X chromosome
E)  None of these are correctF) C) and D)
G) A) and B)

Question 7

Bollworms raised for decades in a lab without exposure to Bt were ___ while those fed Bt were ___.

Accepted Answer

A)  rr, RR
B)  Rr, rr
C)  RR, Rr
D)  RR, rr
E)  Rr, RRF) A) and D)
G) A) and C)

Question 8

If the two alleles for a particular gene are different the gene pair is:

Accepted Answer

A)  Homologous
B)  Heterozygous
C)  Homozygous
D)  Dominant
E)  RecessiveF) None of the above
G) A) and E)

Question 9

In the study of genetics the offspring of the parental generation is referred to as the:

Accepted Answer

A)  Wild type generation
B)  The F1 generation
C)  The P generation
D)  The F2 generation
E)  The phenotypeF) A) and E)
G) D) and E)

Question 10

The chromosome that plays the largest role in human sex determination is:

Accepted Answer

A)  The X chromosome
B)  Chromosome number 21
C)  The group of autosomes known as the SRY group
D)  Chromosome number 22
E)  The Y chromosomeF) All of the above
G) A) and E)

Question 11

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

Question 12

In pedigree charts,autosomal recessive disorders typically:

Accepted Answer

A)  Appear in every generation
B)  Appear only in males
C)  Appear only in females
D)  Seem to disappear in one generation, only to reappear in the next generation
E)  Occur every third generationF) A) and B)
G) A) and C)

Question 13

A karyotype is produced by inducing cells to divide in culture and then treating the cells with a drug that halts mitosis in:

Accepted Answer

A)  Metaphase
B)  Interphase
C)  Prophase
D)  Anaphase
E)  TelophaseF) C) and D)
G) A) and B)

Question 14

The "P" in P generation:

Accepted Answer

A)  Refers to pure breeding
B)  Refers to parental
C)  Refers to potential offspring
D)  Refers to the recessive allele
E)  All are correctF) A) and E)
G) B) and C)

Question 15

If you cross two heterozygous Yy pea plants,what fraction of the offspring will be heterozygous?

Accepted Answer

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

Question 16

A monohybrid cross is a mating between two individuals that are both:

Accepted Answer

A)  Homozygous for one gene
B)  Heterozygous for two genes
C)  Homozygous for two genes
D)  Heterozygous for one gene
E)  None of these are correctF) B) and C)
G) None of the above

Question 17

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)  Meiosis
B)  Mitosis
C)  Fertilization
D)  Crossing over
E)  TranslocationF) B) and E)
G) A) and E)

Question 18

Mendel's monohybrid cross of "Tt" parents resulted in a tall to short ratio of:

Accepted Answer

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

Question 19

If any of the traits that Mendel worked with had been due to linked genes,his dihybrid crosses:

Accepted Answer

A)  Would have had different results
B)  Would have produced more offspring
C)  Would have produced less offspring
D)  Would have exhibited a typical phenotypic ratio of 9:3:3:1
E)  Would have produced sterile offspringF) A) and E)
G) A) and C)

Question 20

Mendel called a trait that is masked:

Accepted Answer

A)  Homozygous
B)  Heterozygous
C)  Dominant
D)  Recessive
E)  None are correctF) None of the above
G) C) and E)

Exam 10: Patterns of Inheritance

A male expresses:

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If any of the traits that Mendel worked with had been due to linked genes,his dihybrid crosses:

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Mendel's monohybrid cross of "Tt" parents resulted in a tall to short ratio of:

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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:

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Mendel called a trait that is masked:

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If an individual is heterozygous for a particular trait:

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A monohybrid cross is a mating between two individuals that are both:

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Any monohybrid cross consisting of one dominant and one recessive allele for the trait being studied should result in a ratio of ______________ dominant to __________________ recessive.

Correct AnswerverifiedShow Answer

If the two alleles for a particular gene are different the gene pair is:

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Bollworms raised for decades in a lab without exposure to Bt were ___ while those fed Bt were ___.

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If you cross two heterozygous Yy pea plants,what fraction of the offspring will be heterozygous?

Correct AnswerverifiedShow Answer

Recessive alleles seem to vanish in some generations and reappear in later generations because:

Correct AnswerverifiedShow Answer

A karyotype is produced by inducing cells to divide in culture and then treating the cells with a drug that halts mitosis in:

Correct AnswerverifiedShow Answer

Mendel called a masking trait:

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

In the study of genetics the offspring of the parental generation is referred to as the:

Correct AnswerverifiedShow Answer

A Barr body is:

Correct AnswerverifiedShow Answer

In pedigree charts,autosomal recessive disorders typically:

Correct AnswerverifiedShow Answer

The "P" in P generation:

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The chromosome that plays the largest role in human sex determination is:

Correct AnswerverifiedShow Answer

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Any monohybrid cross consisting of one dominant and one recessive allele for the trait being studied should result in a ratio of dominant to ____ recessive.

Correct Answer
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Correct Answer
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Bollworms raised for decades in a lab without exposure to Bt were _ while those fed Bt were _.

Correct Answer
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Correct Answer
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