Question 1

Which allele combination represents a recessive monohybrid trait?

Accepted Answer

A)  aa
B)  Aa
C)  AA
D)  ab
E)  AbF) C) and D)
G) A) and C)

Question 2

Mendel's law of segregation implies that the two members of an allele pair

Accepted Answer

A)  are distributed to separate gametes.
B)  are distributed to the same gamete.
C)  are assorted dependently.
D)  are segregated pairwise.
E)  must always code for the identical trait or feature.F) A) and E)
G) B) and C)

Question 3

How many alleles are required to express a monohybrid trait?

Accepted Answer

A)  2
B)  1
C)  3
D)  5
E)  4F) B) and C)
G) B) and D)

Question 4

Which is NOT true according to Mendel's law of segregation?

Accepted Answer

A)  Each individual contains two alleles for each trait.
B)  An individual can have either both dominant alleles,both recessive alleles,or a dominant and recessive allele.
C)  Alleles separate from each other during gamete formation.
D)  Each gamete contains one copy of each allele.
E)  Fertilization restores the presence of two alleles.F) A) and B)
G) A) and D)

Question 5

Which of the following crosses will yield four phenotypes in the 1:1:1:1 ratio?

Accepted Answer

A)  RRYY * RRYY
B)  RRYY * rryy
C)  RrYy * RrYy
D)  RrYy * rryy
E)  rryy *rryyF) A) and E)
G) All of the above

Question 6

Which of the following is an autosomal dominant disorder?

Accepted Answer

A)  Marfan syndrome
B)  Tay-Sachs
C)  sickle cell disease
D)  cystic fibrosis (CF) 
E)  phenylketonuria (PKU) F) A) and E)
G) A) and B)

Question 7

If you were to breed a black male guinea pig to a brown female guinea pig in an attempt to determine which one was homozygous dominant and which one was homozygous recessive,how could you be certain that the guinea pigs are truly homozygous?

Accepted Answer

A)  The guinea pigs would be homozygous for black (or brown) coat color if each strain could be bred for many generations and only black- (or brown-) colored offspring were produced.
B)  If the immediate parents of the black (or brown) guinea pigs were both of that color,it proves they are homozygous.
C)  If a cross between the black and brown guinea pig produced three black and one brown offspring,the black guinea pig would have to be homozygous for black coat color.
D)  If a cross between the black and brown guinea pig produced four all black offspring,this would prove the black guinea pig was recessive.
E)  Only microscopic examination of the guinea pig's genes could absolutely confirm homozygosity.F) B) and D)
G) A) and B)

Question 8

Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) .Three children in a row were born with Tay-Sachs disease.What is the chance that a fourth child will have Tay-Sachs disease?

Accepted Answer

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

Question 9

A cross that involves two traits is called a ______ cross.

Accepted Answer

A)  monohybrid
B)  dihybrid
C)  Punnett
D)  test
E)  homozygousF) A) and E)
G) B) and E)

Question 10

Traits that are controlled by several sets or pairs of alleles,such as skin color and height in humans,are the result of what form of inheritance?

Accepted Answer

A)  polygenic
B)  incomplete dominance
C)  multiple allele systems
D)  simple Mendelian inheritance
E)  codominanceF) A) and C)
G) None of the above

Question 11

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.Two heterozygous individuals reproduce.The expected results are

Accepted Answer

A)  9 black long hair,3 black short hair,3 brown long hair,1 brown short hair.
B)  9 black short hair,6 black long hair,3 brown long hair,1 black short hair.
C)  9 black short hair,3 black long hair,3 brown short hair,1 brown long hair.
D)  9 brown short hair,3 black long hair,3 brown long hair,1 black short hair.
E)  1 black short hair,1 black long hair,1 brown short hair,1 brown long hair.F) D) and E)
G) B) and C)

Question 12

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

Accepted Answer

A)  RRYY * RRYY
B)  RRYY * rryy
C)  RrYy * RrYy
D)  RrYy*rryy
E)  rryy * rryyF) D) and E)
G) All of the above

Question 13

The skin pigment melanin is expressed differently according to exposure to sunlight,with a greater production of the molecule with greater exposure.However,the degree of production can never exceed the inherited genetic level.What evolutionary advantage would be gained from having this phenotypic range for skin pigmentation?

Accepted Answer

A)  Skin color is an example of polygenic inheritance.
B)  It allows someone to get a tan when they want to.
C)  Production of the molecule would only occur when necessary.
D)  Changes in skin color allow humans to look healthier.
E)  Skin color is an example of a codominant gene.F) A) and D)
G) C) and D)

Question 14

The four o'clock flower is an example of incomplete dominance: R = red,r = white,and Rr = pink.If two hybrids are crossed,what are the chances that an offspring will have pink flowers?

Accepted Answer

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

Question 15

If you had a black male guinea pig and brown female guinea pig,but you didn't know which was the dominant characteristic,how would you find out the dominant color,assuming the dominant characteristic is homozygous,?

Accepted Answer

A)  Mate them and see what color the offspring are-that will be the dominant color.
B)  Mate them and see what color the offspring are-the other will be the dominant color.
C)  Mate them,and then mate their offspring to see what color the next generation is-that will be the dominant color.
D)  Mate them together,and then mate their offspring to see what color the next generation is-the other color will be the dominant color.
E)  The dominant color could not be determined by mating the two,and then mating their offspring; further generations would have to be produced to determine the dominant color.F) C) and D)
G) B) and E)

Question 16

Humans can have any of several eye colors,This is because we possess a variety of

Accepted Answer

A)  particulates.
B)  genotypes.
C)  loci.
D)  alleles.
E)  homologous.F) A) and C)
G) A) and B)

Question 17

Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers.What are the genotypes of the two parents? (W = widow's peak; S = short fingers)

Accepted Answer

A)  WWSS * wwss
B)  wwss * WWSS
C)  WWss * WWss
D)  WwSs * WwSs
E)  WwSs * wwssF) C) and D)
G) A) and B)

Exam 23: Patterns of Gene Inheritance

The four o'clock flower is an example of incomplete dominance: R = red,r = white,and Rr = pink.If two hybrids are crossed,what are the chances that an offspring will have pink flowers?

Correct Answer
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Correct Answer
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Which of the following crosses will yield four phenotypes in the 1:1:1:1 ratio?

Correct Answer
verified

If you were to breed a black male guinea pig to a brown female guinea pig in an attempt to determine which one was homozygous dominant and which one was homozygous recessive,how could you be certain that the guinea pigs are truly homozygous?

Correct Answer
verified

If you had a black male guinea pig and brown female guinea pig,but you didn't know which was the dominant characteristic,how would you find out the dominant color,assuming the dominant characteristic is homozygous,?

Correct Answer
verified

Humans can have any of several eye colors,This is because we possess a variety of

Correct Answer
verified

Mendel's law of segregation implies that the two members of an allele pair

Correct Answer
verified

Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) .Three children in a row were born with Tay-Sachs disease.What is the chance that a fourth child will have Tay-Sachs disease?

Correct Answer
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How many alleles are required to express a monohybrid trait?

Correct Answer
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Which allele combination represents a recessive monohybrid trait?

Correct Answer
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Which is NOT true according to Mendel's law of segregation?

Correct Answer
verified

Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers.What are the genotypes of the two parents? (W = widow's peak; S = short fingers)

Correct Answer
verified

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

Correct Answer
verified

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.Two heterozygous individuals reproduce.The expected results are

Correct Answer
verified

A cross that involves two traits is called a ______ cross.

Correct Answer
verified

Traits that are controlled by several sets or pairs of alleles,such as skin color and height in humans,are the result of what form of inheritance?

Correct Answer
verified

Which of the following is an autosomal dominant disorder?

Correct Answer
verified

Exam 23: Patterns of Gene Inheritance

The four o'clock flower is an example of incomplete dominance: R = red,r = white,and Rr = pink.If two hybrids are crossed,what are the chances that an offspring will have pink flowers?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following crosses will yield four phenotypes in the 1:1:1:1 ratio?

Correct AnswerverifiedShow Answer

If you were to breed a black male guinea pig to a brown female guinea pig in an attempt to determine which one was homozygous dominant and which one was homozygous recessive,how could you be certain that the guinea pigs are truly homozygous?

Correct AnswerverifiedShow Answer

If you had a black male guinea pig and brown female guinea pig,but you didn't know which was the dominant characteristic,how would you find out the dominant color,assuming the dominant characteristic is homozygous,?

Correct AnswerverifiedShow Answer

Humans can have any of several eye colors,This is because we possess a variety of

Correct AnswerverifiedShow Answer

Mendel's law of segregation implies that the two members of an allele pair

Correct AnswerverifiedShow Answer

Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) .Three children in a row were born with Tay-Sachs disease.What is the chance that a fourth child will have Tay-Sachs disease?

Correct AnswerverifiedShow Answer

How many alleles are required to express a monohybrid trait?

Correct AnswerverifiedShow Answer

Which allele combination represents a recessive monohybrid trait?

Correct AnswerverifiedShow Answer

Which is NOT true according to Mendel's law of segregation?

Correct AnswerverifiedShow Answer

Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers.What are the genotypes of the two parents? (W = widow's peak; S = short fingers)

Correct AnswerverifiedShow Answer

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

Correct AnswerverifiedShow Answer

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.Two heterozygous individuals reproduce.The expected results are

Correct AnswerverifiedShow Answer

A cross that involves two traits is called a ______ cross.

Correct AnswerverifiedShow Answer

Traits that are controlled by several sets or pairs of alleles,such as skin color and height in humans,are the result of what form of inheritance?

Correct AnswerverifiedShow Answer

Which of the following is an autosomal dominant disorder?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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