Question 1

When crossing individuals with differing genotypes,in which kind of cross would you expect to have your actual results match the predicted results 100% of the time the cross is made?

Accepted Answer

A)  monohybrid cross
B)  dihybrid cross
C)  test cross
D)  independent assortment cross
E)  crosses of differing genotypes result in differing answers-no cross will produce expected ratios every timeF) A) and C)
G) A) and E)

Question 2

You have two true-breeding rose bushes,one with red flowers and one with white flowers.A cross between these two roses yields a bush with pink flowers.What condition does this demonstrate?

Accepted Answer

A)  codominance
B)  incomplete dominance
C)  environmental effects
D)  polygenetic inheritance
E)  monohybrid inheritanceF) A) and C)
G) A) and B)

Question 3

Which of the following would be considered a heterozygous dihybrid genotype?

Accepted Answer

A)  Ww
B)  sS
C)  WWSs
D)  WWss
E)  WwSsF) A) and C)
G) A) and B)

Question 4

The ability to roll the edges of the tongue upward in a U-shape has been considered to be an inherited ability.The standard assumption is that tongue-rolling is a dominant allele at a single gene locus.Which of the following would cast doubt on this assumption?

Accepted Answer

A)  Behaviors are not inherited,only structures are inherited.
B)  A student who cannot roll his tongue has a mother and father,both of whom can.
C)  A student who can roll his tongue has a mother and father,both of whom cannot.
D)  With very little effort the non-tongue-rollers can learn to also roll their tongues.
E)  A student who can roll his tongue has a mother and father,both of whom cannot roll their tongues AND with very little effort the non-tongue-rollers can learn to roll their tongues.F) B) and E)
G) A) and B)

Question 5

If an albino (recessive) woman is married to a man with normal coloring and they have an albino child,what was the genotype of the man?

Accepted Answer

A)  homozygous dominant
B)  heterozygous
C)  homozygous recessive
D)  incomplete dominance
E)  sex-linked recessiveF) B) and D)
G) D) and E)

Question 6

If an organism shows a recessive phenotype,such as short pea plants,its genotype can be

Accepted Answer

A)  either TT or Tt.
B)  either Tt or tt.
C)  only TT.
D)  only tt.
E)  TT,Tt,or tt.F) A) and C)
G) A) and E)

Question 7

Which of the following crosses will yield only homozygous recessive offspring?

Accepted Answer

A)  RRYY * RRYY
B)  RRYY *rryy
C)  RrYy * rryy
D)  rryy *rryy
E)  RrYy *RrYyF) None of the above
G) B) and E)

Question 8

All but one of the following experiments would allow a scientist to discover if the phenotype of an organism would be affected by environmental changes.Choose the experiment that would NOT show environmental effects.

Accepted Answer

A)  Cuttings are taken from an English Ivy plant and are then grown in soils with different pH levels.
B)  A Siamese cat has patches of fur removed from its hips and an ice pack is secured over the area.
C)  A mouse with the genetic disorder phenylketonuria (PKU) is fed a diet low in phenylalanine for a year and then changed to a diet rich in the same molecule.
D)  A group of mice that show the same dominant trait are fed a variety of identical diets to determine if they show different body types.
E)  A hydrangea is grown for one year in aluminum-poor soil and then grown for one year in aluminum-rich soil.F) None of the above
G) C) and E)

Question 9

Tay-Sachs is a recessive genetic disease in humans.If one parent is homozygous normal and the other is a carrier (heterozygous) ,what are the chances that their child will have this disease?

Accepted Answer

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

Question 10

Unattached earlobes (EE or Ee) are dominant over attached earlobes (ee) .A couple both have unattached earlobes.Both notice that one of their parents on both sides have attached earlobes (ee) .Therefore,they correctly assume that they are carriers for attached earlobes (Ee) .If the couple proceeds to have four children,then

Accepted Answer

A)  they can be certain that three will be heterozygous and one homozygous recessive.
B)  if the first three are heterozygous,the fourth must be homozygous recessive.
C)  the children must repeat the grandparents' genotype (Ee) .
D)  all children must have unattached earlobes since both parents possess the dominant gene for it.
E)  two heterozygous,one homozygous dominant,and one homozygous recessive is a likely outcome,but all genotype ratios are possible.F) All of the above
G) A) and B)

Question 11

In cattle,consider that the lack of horns is dominant to the presence of horns.A bull without horns is crossed with a horned cow.Of four offspring,one is horned and the other three lack horns.The bull is

Accepted Answer

A)  homozygous dominant.
B)  homozygous recessive.
C)  heterozygous.
D)  sex-lined recessive.
E)  heterozygous recessive.F) A) and C)
G) A) and B) C

Question 12

In horses,black coat (B) is dominant over brown coat (b) ,and being a trotter (T) is dominant over being a pacer (t) .A black horse who is a pacer is crossed with a brown horse who is a trotter.The offspring is a brown pacer.What is the genotype of the brown trotter parent?

Accepted Answer

A)  BBTT
B)  BbTt
C)  Bbtt
D)  bbTt
E)  bbttF) A) and B)
G) A) and C) D

Question 13

Indicate the genotypic and phenotypic ratios that you could expect if an individual who is heterozygous for Huntington disease has children with a normal individual.

Accepted Answer

The individual who is heterozygous for H...

Question 14

What are alleles?

Accepted Answer

A)  genes for different traits,such as hair color and eye color
B)  alternative forms of a gene for a single trait,such as blue eyes or brown eyes
C)  the locations of genes on a chromosome
D)  recessive forms of a kind of characteristic carried by genes
E)  dominant forms of a kind of characteristic carried by genesF) A) and C)
G) A) and B)

Question 15

A cross is made between two parents with genotypes AaBB and aabb.If there are 32 offspring,how many of them would be expected to exhibit both dominant characteristics?

Accepted Answer

A)  32
B)  24
C)  16
D)  8
E)  0F) A) and C)
G) B) and C)

Question 16

The _____ indicates the gene combination of an individual.

Accepted Answer

A)  phenotype
B)  loci
C)  genotype
D)  dominance
E)  homozygousF) A) and B)
G) A) and C) C

Question 17

If the genotype of an organism is YySsTt,then yST would represent

Accepted Answer

A)  the genotype of the offspring.
B)  a possible phenotype of the offspring.
C)  a gamete of the parent.
D)  a possible zygote.
E)  the P generation.F) A) and B)
G) A) and C)

Question 18

To try and discover if the environment has an effect on a particular characteristic,scientists often examine

Accepted Answer

A)  siblings that share only one parent and were separated at birth.
B)  fraternal human twins that were separated at birth.
C)  identical human twins that were separated at birth.
D)  siblings that share both parents and were separated at birth.
E)  unrelated children who have been adopted by the same family and grown up together.F) C) and D)
G) A) and C)

Question 19

Which genetic disorder is associated with an irregular shape of the red blood cells?

Accepted Answer

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

Question 20

Alternative forms of a gene that influence the same trait and are found at the same location in homologous chromosomes are called

Accepted Answer

A)  alleles.
B)  phenotypes.
C)  genotypes.
D)  codominant.
E)  incomplete dominance.F) C) and E)
G) A) and B)

Exam 23: Patterns of Gene Inheritance

When crossing individuals with differing genotypes,in which kind of cross would you expect to have your actual results match the predicted results 100% of the time the cross is made?

Correct Answer
verified

You have two true-breeding rose bushes,one with red flowers and one with white flowers.A cross between these two roses yields a bush with pink flowers.What condition does this demonstrate?

Correct Answer
verified

Which of the following would be considered a heterozygous dihybrid genotype?

Correct Answer
verified

The ability to roll the edges of the tongue upward in a U-shape has been considered to be an inherited ability.The standard assumption is that tongue-rolling is a dominant allele at a single gene locus.Which of the following would cast doubt on this assumption?

Correct Answer
verified

If an albino (recessive) woman is married to a man with normal coloring and they have an albino child,what was the genotype of the man?

Correct Answer
verified

If an organism shows a recessive phenotype,such as short pea plants,its genotype can be

Correct Answer
verified

Which of the following crosses will yield only homozygous recessive offspring?

Correct Answer
verified

All but one of the following experiments would allow a scientist to discover if the phenotype of an organism would be affected by environmental changes.Choose the experiment that would NOT show environmental effects.

Correct Answer
verified

Tay-Sachs is a recessive genetic disease in humans.If one parent is homozygous normal and the other is a carrier (heterozygous) ,what are the chances that their child will have this disease?

Correct Answer
verified

Correct Answer
verified

In cattle,consider that the lack of horns is dominant to the presence of horns.A bull without horns is crossed with a horned cow.Of four offspring,one is horned and the other three lack horns.The bull is

Correct Answer
verified
C

In horses,black coat (B) is dominant over brown coat (b) ,and being a trotter (T) is dominant over being a pacer (t) .A black horse who is a pacer is crossed with a brown horse who is a trotter.The offspring is a brown pacer.What is the genotype of the brown trotter parent?

Correct Answer
verified
D

Indicate the genotypic and phenotypic ratios that you could expect if an individual who is heterozygous for Huntington disease has children with a normal individual.

Correct Answer
verified
The individual who is heterozygous for H...
View Answer

What are alleles?

Correct Answer
verified

A cross is made between two parents with genotypes AaBB and aabb.If there are 32 offspring,how many of them would be expected to exhibit both dominant characteristics?

Correct Answer
verified

The _____ indicates the gene combination of an individual.

Correct Answer
verified
C

If the genotype of an organism is YySsTt,then yST would represent

Correct Answer
verified

To try and discover if the environment has an effect on a particular characteristic,scientists often examine

Correct Answer
verified

Which genetic disorder is associated with an irregular shape of the red blood cells?

Correct Answer
verified

Alternative forms of a gene that influence the same trait and are found at the same location in homologous chromosomes are called

Correct Answer
verified

Exam 23: Patterns of Gene Inheritance

When crossing individuals with differing genotypes,in which kind of cross would you expect to have your actual results match the predicted results 100% of the time the cross is made?

Correct AnswerverifiedShow Answer

You have two true-breeding rose bushes,one with red flowers and one with white flowers.A cross between these two roses yields a bush with pink flowers.What condition does this demonstrate?

Correct AnswerverifiedShow Answer

Which of the following would be considered a heterozygous dihybrid genotype?

Correct AnswerverifiedShow Answer

The ability to roll the edges of the tongue upward in a U-shape has been considered to be an inherited ability.The standard assumption is that tongue-rolling is a dominant allele at a single gene locus.Which of the following would cast doubt on this assumption?

Correct AnswerverifiedShow Answer

If an albino (recessive) woman is married to a man with normal coloring and they have an albino child,what was the genotype of the man?

Correct AnswerverifiedShow Answer

If an organism shows a recessive phenotype,such as short pea plants,its genotype can be

Correct AnswerverifiedShow Answer

Which of the following crosses will yield only homozygous recessive offspring?

Correct AnswerverifiedShow Answer

All but one of the following experiments would allow a scientist to discover if the phenotype of an organism would be affected by environmental changes.Choose the experiment that would NOT show environmental effects.

Correct AnswerverifiedShow Answer

Tay-Sachs is a recessive genetic disease in humans.If one parent is homozygous normal and the other is a carrier (heterozygous) ,what are the chances that their child will have this disease?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In cattle,consider that the lack of horns is dominant to the presence of horns.A bull without horns is crossed with a horned cow.Of four offspring,one is horned and the other three lack horns.The bull is

Correct AnswerverifiedC

In horses,black coat (B) is dominant over brown coat (b) ,and being a trotter (T) is dominant over being a pacer (t) .A black horse who is a pacer is crossed with a brown horse who is a trotter.The offspring is a brown pacer.What is the genotype of the brown trotter parent?

Correct AnswerverifiedD

Indicate the genotypic and phenotypic ratios that you could expect if an individual who is heterozygous for Huntington disease has children with a normal individual.

Correct AnswerverifiedThe individual who is heterozygous for H...View AnswerShow Answer

What are alleles?

Correct AnswerverifiedShow Answer

A cross is made between two parents with genotypes AaBB and aabb.If there are 32 offspring,how many of them would be expected to exhibit both dominant characteristics?

Correct AnswerverifiedShow Answer

The _____ indicates the gene combination of an individual.

Correct AnswerverifiedC

If the genotype of an organism is YySsTt,then yST would represent

Correct AnswerverifiedShow Answer

To try and discover if the environment has an effect on a particular characteristic,scientists often examine

Correct AnswerverifiedShow Answer

Which genetic disorder is associated with an irregular shape of the red blood cells?

Correct AnswerverifiedShow Answer

Alternative forms of a gene that influence the same trait and are found at the same location in homologous chromosomes are called

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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C

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D

Correct Answer
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The individual who is heterozygous for H...
View Answer

Correct Answer
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Correct Answer
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C

Correct Answer
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Correct Answer
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Correct Answer
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