Question 1

What is the blending theory of inheritance? How did Mendel disprove this theory?

Accepted Answer

The blending theory of inheritance state...

Question 2

In pea plants, the gene for round seed (R)  is dominant, and wrinkled seeds (r)  are recessive. The endosperm of the pea is also either starchy, a dominant gene (S) , or waxy (s) . What can be said of a fully heterozygous, dihybrid cross?

Accepted Answer

A)   It is impossible to secure offspring that are homozygous for both dominant genes.
B)   It is impossible to secure offspring that are homozygous for both recessive genes.
C)   It is impossible to secure offspring that are homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene.
D)   All of these choices are impossible combinations in a dihybrid cross.
E)   All of these choices are possible combinations in a dihybrid cross.F) All of the above
G) A) and B)

Question 3

A range of genotypes and phenotypes occur in polygenic inheritance. Draw a graph that depicts this pattern of continuous variation in polygenic inheritance.

Accepted Answer

The pattern takes the shape of a bell-shaped curve, or a normal distribution pattern. The graph should resemble the one depicted.

Question 4

Since each child of two heterozygous parents has a 50% chance of receiving a recessive trait from each parent,

Accepted Answer

A)   if the first child is phenotypically recessive, then the next child must be phenotypically dominant.
B)   if the first child is phenotypically recessive, then the next child has a 3/4 chance of being phenotypically recessive.
C)   if the first child is phenotypically recessive, then the next child has a 1/2 chance of being phenotypically recessive.
D)   no matter what the first child's phenotype, the next child will have a 1/4 chance of being phenotypically recessive.E) None of the above
F) B) and D)

Question 5

As many as 60% of people in malaria-infected regions of Africa have the sickle-cell allele, but only about 10% of the U.S. population of African ancestry carries the allele. Malaria remains a major disease in central Africa but has not been a serious problem in the U.S. for many generations. What is/are the reason(s)  for the difference in the percentages and what is a reasonable statement about future percentages?

Accepted Answer

A)   The presence of malaria in Africa maintains the advantage of the heterozygous sickle-cell trait, and the prevalence of malaria will likely continue to preserve the 60% rate.
B)   The U. S. percentage may have always been somewhat lower due to immigration from nonmalaria regions, but changes in sites and rates of immigration could occur.
C)   Lack of widespread malaria in the United States would have made both homozygous and heterozygous carriers of sickle-cell undergo several generations of negative selection, and we should expect this to continue unless innovative therapies give all individuals an equal chance of surviving and reproducing.
D)   All of the choices are reasonable.E) None of the above
F) C) and D)

Question 6

During Mendel's pea plants experiment he discovered that the trait for tallness is dominant to that of shortness. Which of the following statements is correct?

Accepted Answer

A)   Tall = TT or Tt while short = tt
B)   Tall = TT or tt while short = Tt
C)   Tall = tt while short = TT or Tt
D)   None of these statements are correct.E) All of the above
F) None of the above

Question 7

Which characteristic of pea plants were important in their selection as Mendel's research organism?

Accepted Answer

A)   Peas are easy to cultivate.
B)   Pea plants have a short generation time.
C)   Pea plants are self-pollinating but can be cross-fertilized easily.
D)   Many true-breeding varieties were available.
E)   All of these were important characteristics in Mendel's selection.F) A) and B)
G) A) and E)

Question 8

Which of the following disorders is not a X-linked trait?

Accepted Answer

A)   hemophilia
B)   Muscular dystrophy
C)   Adrenoleukodystrophy
D)   All of these are X-linked disordersE) None of the above
F) A) and B)

Question 9

In the use of a Punnett square for genetic results of crossing individuals

Accepted Answer

A)   all different kinds of sperm are lined up either horizontally or vertically.
B)   all different kinds of eggs are lined up either horizontally or vertically.
C)   the results show the offspring's expected genotypes.
D)   All of the choices are correct.
E)   Only two of the choices are correct.F) B) and C)
G) A) and E)

Question 10

Where does independent assortment occur in meiosis (what stage)? Where is the law of segregation evident in meiosis? What is the result of independent assortment and segregation? Explain your answer.

Accepted Answer

In metaphase I of meiosis, homologous ch...

Question 11

Each gamete carries one factor, now called an allele, for each inherited trait.

Accepted Answer

A) True 
 B)False

Question 12

The most common lethal genetic disease among Caucasians is

Accepted Answer

A)   neurofibromatosis.
B)   Tay-Sachs disease.
C)   phenylketonuria.
D)   albinism.
E)   cystic fibrosis.F) A) and E)
G) B) and E)

Question 13

What is the blending theory of inheritance?

Accepted Answer

A)   Mendel's theory of how the traits of parents are passed to offspring through the gametes
B)   Darwin's theory of how traits are passed from all parts of the parent's body into the gamete to be transmitted to the offspring
C)   The modern theory of how genetic information is passed from parents to offspring
D)   An old theory that said that offspring show traits intermediate between those of the parentsE) A) and C)
F) A) and B)

Question 14

If a human who is a tongue roller (T)  and has unattached ear lobes (E)  marries a person who cannot roll their tongue and has attached earlobes, could they produce an offspring that was also a non-tongue roller with attached earlobes? What would be the genotype of the first parent? the second parent?

Accepted Answer

A)   yes; TtEe; ttee
B)   yes; TtEE; ttEe
C)   no; TTEE; ttee
D)   unable to determine from the information givenE) B) and C)
F) A) and D) A

Question 15

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)   A teacher reports that after testing her class on the ability to roll their tongue, with very little effort the non-tongue-rollers can learn to also roll their tongues.
B)   A student who can roll his tongue has a mother and father, both of whom cannot.
C)   A student who cannot roll his tongue has a mother and father, both of whom can.
D)   Two of the above are situations that would cast doubt on this assumption.E) None of the above
F) A) and B)

Question 16

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

Accepted Answer

A)   Each individual contains two factors for each trait.
B)   One factor must be dominant and one factor recessive in each individual.
C)   Factors separate from each other during gamete formation.
D)   Each gamete contains one copy of each factor.
E)   Fertilization restores the presence of two factors.F) A) and C)
G) All of the above

Question 17

An individual with blood type A marries an individual with blood type B.
An individual with blood type A marries an individual with blood type B.
A. What blood types could their offspring exhibit?
B. Provide the possible genotypes of parents and offspring produced.
C. What pattern of inheritance is this?

Accepted Answer

A. The offspring could have Bl...

Question 18

Haiti is settled by peoples of both African and European ancestry. A young couple, both with mixed ancestry, marry and have several children. The children vary widely in the amount of skin melanin production, with one child being lighter than both parents, and one being darker. The simple explanation for this is

Accepted Answer

A)   epistasis.
B)   multiple alleles are available for the one chromosomal locus that governs skin color.
C)   the environment affected the phenotype that developed.
D)   polygenic inheritance.
E)   gene linkage.F) A) and D)
G) None of the above

Question 19

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

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 recessive and one homozygous dominant is a likely outcome, but all heterozygous, or two, three or all four homozygous are also possible.F) None of the above
G) A) and E) E

Question 20

Which occurrence is when an individual inherits a dominant gene but does not fully express the dominant phenotype?

Accepted Answer

A)   incomplete penetrance
B)   incomplete dominance
C)   polygenic inheritance
D)   pleiotropyE) A) and B)
F) None of the above

Exam 11: Mendelian Patterns of Inheritance

What is the blending theory of inheritance? How did Mendel disprove this theory?

Correct Answer
verified
The blending theory of inheritance state...
View Answer

In pea plants, the gene for round seed (R) is dominant, and wrinkled seeds (r) are recessive. The endosperm of the pea is also either starchy, a dominant gene (S) , or waxy (s) . What can be said of a fully heterozygous, dihybrid cross?

Correct Answer
verified

A range of genotypes and phenotypes occur in polygenic inheritance. Draw a graph that depicts this pattern of continuous variation in polygenic inheritance.

Correct Answer
verified
The pattern takes the shape of a bell-shaped curve, or a normal distribution pattern. The graph should resemble the one depicted. 11eaa8b6_a14b_1cfa_a3f5_4b634f0e0785_TB4749_00

Since each child of two heterozygous parents has a 50% chance of receiving a recessive trait from each parent,

Correct Answer
verified

Correct Answer
verified

During Mendel's pea plants experiment he discovered that the trait for tallness is dominant to that of shortness. Which of the following statements is correct?

Correct Answer
verified

Which characteristic of pea plants were important in their selection as Mendel's research organism?

Correct Answer
verified

Which of the following disorders is not a X-linked trait?

Correct Answer
verified

In the use of a Punnett square for genetic results of crossing individuals

Correct Answer
verified

Where does independent assortment occur in meiosis (what stage)? Where is the law of segregation evident in meiosis? What is the result of independent assortment and segregation? Explain your answer.

Correct Answer
verified
In metaphase I of meiosis, homologous ch...
View Answer

Each gamete carries one factor, now called an allele, for each inherited trait.

Correct Answer
verified

The most common lethal genetic disease among Caucasians is

Correct Answer
verified

What is the blending theory of inheritance?

Correct Answer
verified

If a human who is a tongue roller (T) and has unattached ear lobes (E) marries a person who cannot roll their tongue and has attached earlobes, could they produce an offspring that was also a non-tongue roller with attached earlobes? What would be the genotype of the first parent? the second parent?

Correct Answer
verified
A

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

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

Correct Answer
verified

Correct Answer
verified
A. The offspring could have Bl...
View Answer

Correct Answer
verified

Correct Answer
verified
E

Which occurrence is when an individual inherits a dominant gene but does not fully express the dominant phenotype?

Correct Answer
verified

Exam 11: Mendelian Patterns of Inheritance

What is the blending theory of inheritance? How did Mendel disprove this theory?

Correct AnswerverifiedThe blending theory of inheritance state...View AnswerShow Answer

In pea plants, the gene for round seed (R) is dominant, and wrinkled seeds (r) are recessive. The endosperm of the pea is also either starchy, a dominant gene (S) , or waxy (s) . What can be said of a fully heterozygous, dihybrid cross?

Correct AnswerverifiedShow Answer

A range of genotypes and phenotypes occur in polygenic inheritance. Draw a graph that depicts this pattern of continuous variation in polygenic inheritance.

Correct AnswerverifiedThe pattern takes the shape of a bell-shaped curve, or a normal distribution pattern. The graph should resemble the one depicted. 11eaa8b6_a14b_1cfa_a3f5_4b634f0e0785_TB4749_00

Since each child of two heterozygous parents has a 50% chance of receiving a recessive trait from each parent,

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

During Mendel's pea plants experiment he discovered that the trait for tallness is dominant to that of shortness. Which of the following statements is correct?

Correct AnswerverifiedShow Answer

Which characteristic of pea plants were important in their selection as Mendel's research organism?

Correct AnswerverifiedShow Answer

Which of the following disorders is not a X-linked trait?

Correct AnswerverifiedShow Answer

In the use of a Punnett square for genetic results of crossing individuals

Correct AnswerverifiedShow Answer

Where does independent assortment occur in meiosis (what stage)? Where is the law of segregation evident in meiosis? What is the result of independent assortment and segregation? Explain your answer.

Correct AnswerverifiedIn metaphase I of meiosis, homologous ch...View AnswerShow Answer

Each gamete carries one factor, now called an allele, for each inherited trait.

Correct AnswerverifiedShow Answer

The most common lethal genetic disease among Caucasians is

Correct AnswerverifiedShow Answer

What is the blending theory of inheritance?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

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

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA. The offspring could have Bl...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedE

Which occurrence is when an individual inherits a dominant gene but does not fully express the dominant phenotype?

Correct AnswerverifiedShow Answer

Correct Answer
verified
The blending theory of inheritance state...
View Answer

Correct Answer
verified

Correct Answer
verified
The pattern takes the shape of a bell-shaped curve, or a normal distribution pattern. The graph should resemble the one depicted. 11eaa8b6_a14b_1cfa_a3f5_4b634f0e0785_TB4749_00

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
In metaphase I of meiosis, homologous ch...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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A

Correct Answer
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Correct Answer
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Correct Answer
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A. The offspring could have Bl...
View Answer

Correct Answer
verified

Correct Answer
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E

Correct Answer
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