Question 1

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the first parent?

Accepted Answer

A)  AA
B)  Aa
C)  aa
D)  The answer cannot be determined from this information.E) A) and B)
F) B) and D)

Question 2

Which of the following statements 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 D)
G) A) and C)

Question 3

A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has a(n) ________ genotype.

Accepted Answer

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

Question 4

Polygenic traits such as height or weight are often influenced by the environment of the organism.

Accepted Answer

A) True 
 B)False

Question 5

The F2 offspring of a classic Mendelian monohybrid cross between homozygous dominant and homozygous recessive parents would produce the genotype(s)

Accepted Answer

A)  AA and Aa.
B)  Aa and aa.
C)  AA,Aa,and aa.
D)  AA only.
E)  Aa only.F) A) and D)
G) B) and D)

Question 6

Which is associated with the inability to produce factor VIII in the blood?

Accepted Answer

A)  Williams syndrome
B)  trisomy 21
C)  color blindness
D)  hemophilia A
E)  Duchenne muscular dystrophyF) A) and B)
G) All of the above

Question 7

In 1940,two researchers named Weiner and Landsteiner discovered that about 85 percent of the human population sampled possessed a blood cell protein that had been previously detected in Rhesus monkeys.This blood type was labeled Rh positive,and Rh+ was found to be dominant over the absence of the blood factor (Rh-) .Under normal Mendelian inheritance,which of the following statements is FALSE?

Accepted Answer

A)  Two Rh+ parents could have an Rh- child.
B)  Two Rh- parents could have an Rh+ child.
C)  An Rh- child would require that both parents be carriers of at least one Rh- gene.
D)  It is possible with just one pair of parents to have children where some siblings are Rh- and some are Rh+.
E)  All of the choices are false.F) All of the above
G) C) and D)

Question 8

Which of the following is NOT part of Mendel's law of segregation?

Accepted Answer

A)  Each individual has two factors for each trait.
B)  The factors segregate during meiosis.
C)  Each gamete will carry two factors for a trait.
D)  Fertilization gives the offspring two factors for each trait.E) C) and D)
F) None of the above

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

What are alleles?

Accepted Answer

A)  genes for different traits,such as hair color or 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)  the recessive form of a gene
E)  the dominant form of a geneF) A) and D)
G) B) and E)

Question 11

If a pea plant shows a recessive phenotype,

Accepted Answer

A)  the genotype may be TT or Tt.
B)  the genotype may be Tt or tt.
C)  the genotype can only be TT.
D)  the genotype can only be tt.
E)  the genotype may be TT,Tt,or tt.F) A) and B)
G) A) and C)

Question 12

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) A) and D)
F) A) and C)

Question 13

In a classic Mendelian monohybrid cross between a homozygous dominant parent and a homozygous recessive parent,which generation is always completely heterozygous?

Accepted Answer

A)  F1 generation
B)  F2 generation
C)  F3 generation
D)  P generationE) A) and B)
F) B) and D)

Question 14

Which of the following statements accurately describes Gregor Mendel?

Accepted Answer

A)  He had a strong background in mathematics.
B)  He was very deliberate and followed the scientific method closely while doing his research.
C)  He kept very detailed records of his research.
D)  He conducted many preliminary studies with various animals and plants.
E)  All of the statements accurately describe Gregor Mendel.F) All of the above
G) A) and B)

Question 15

Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive.Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes.Why?

Accepted Answer

A)  The lethal recessive gene may be incompletely dominant.
B)  Spreading the gene among offspring of both sexes will increase the likelihood it will be sex-linked and expressed.
C)  The selective-mating of closely related individuals,or inbreeding,increases the chances that two recessive genes will "meet" in offspring.
D)  "Pleiotropy"-the gene that is being selected for this trait may have the second effect of being lethal.
E)  "Epistasis"-selection for the desired trait may result in "uncovering" the lethal gene.F) C) and D)
G) A) and C)

Question 16

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...

Question 17

When an individual of African descent marries and has children with an individual of European descent,their children often have a mid-shade of skin color,but they could also have a light shade or a dark shade.This can best be described as

Accepted Answer

A)  X-linked inheritance.
B)  polygenic inheritance.
C)  pleiotropic inheritance.
D)  the dominance of the gene for dark skin tone.E) None of the above
F) B) and C)

Question 18

Which of the following is NOT a trait that is the result of,or is affected by,the interaction of more than one gene?

Accepted Answer

A)  human skin color
B)  cleft palate
C)  height
D)  sickle-cell anemiaE) A) and D)
F) A) and C)

Question 19

A single,simple,recessively inherited mutation inactivates the enzyme that converts phenylalanine to tyrosine.Homozygous recessive individuals possess an excessive amount of phenylalanine and a deficiency of tyrosine.Additionally,these individuals may be mentally deficient,have abnormally light hair and abnormally light skin color.This disorder is an example of

Accepted Answer

A)  incomplete penetrance.
B)  incomplete dominance.
C)  polygenic inheritance.
D)  pleiotropy.E) C) and D)
F) A) and C)

Question 20

The pedigree chart depicts the inheritance pattern of ________.Circles depict females and squares depict males.Colored shapes represent affected individuals (expressing a trait) and uncolored shapes are unaffected (do not express a trait) .

Accepted Answer

A)  an autosomal recessive characteristic with both parents being heterozygous
B)  an autosomal dominant characteristic with both parents being homozygous dominant
C)  an autosomal recessive characteristic with both parents being homozygous recessive
D)  None.E) None of the above
F) A) and D)

Exam 11: Mendelian Patterns of Inheritance

Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive.Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes.Why?

Correct Answer
verified

Which is associated with the inability to produce factor VIII in the blood?

Correct Answer
verified

A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has a(n) ________ genotype.

Correct Answer
verified

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

Correct Answer
verified

Which of the following is NOT part of Mendel's law of segregation?

Correct Answer
verified

Polygenic traits such as height or weight are often influenced by the environment of the organism.

Correct Answer
verified

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

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...
View Answer

Correct Answer
verified

The pedigree chart depicts the inheritance pattern of ________.Circles depict females and squares depict males.Colored shapes represent affected individuals (expressing a trait) and uncolored shapes are unaffected (do not express a trait) .

Correct Answer
verified

Correct Answer
verified

What are alleles?

Correct Answer
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In a classic Mendelian monohybrid cross between a homozygous dominant parent and a homozygous recessive parent,which generation is always completely heterozygous?

Correct Answer
verified

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

Correct Answer
verified

Which of the following statements accurately describes Gregor Mendel?

Correct Answer
verified

When an individual of African descent marries and has children with an individual of European descent,their children often have a mid-shade of skin color,but they could also have a light shade or a dark shade.This can best be described as

Correct Answer
verified

The F₂ offspring of a classic Mendelian monohybrid cross between homozygous dominant and homozygous recessive parents would produce the genotype(s)

Correct Answer
verified

If a pea plant shows a recessive phenotype,

Correct Answer
verified

Which of the following is NOT a trait that is the result of,or is affected by,the interaction of more than one gene?

Correct Answer
verified

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the first parent?

Correct Answer
verified

Exam 11: Mendelian Patterns of Inheritance

Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive.Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes.Why?

Correct AnswerverifiedShow Answer

Which is associated with the inability to produce factor VIII in the blood?

Correct AnswerverifiedShow Answer

A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has a(n) ________ genotype.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is NOT part of Mendel's law of segregation?

Correct AnswerverifiedShow Answer

Polygenic traits such as height or weight are often influenced by the environment of the organism.

Correct AnswerverifiedShow Answer

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

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...View AnswerShow Answer

Correct AnswerverifiedShow Answer

The pedigree chart depicts the inheritance pattern of ________.Circles depict females and squares depict males.Colored shapes represent affected individuals (expressing a trait) and uncolored shapes are unaffected (do not express a trait) .

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What are alleles?

Correct AnswerverifiedShow Answer

In a classic Mendelian monohybrid cross between a homozygous dominant parent and a homozygous recessive parent,which generation is always completely heterozygous?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements accurately describes Gregor Mendel?

Correct AnswerverifiedShow Answer

When an individual of African descent marries and has children with an individual of European descent,their children often have a mid-shade of skin color,but they could also have a light shade or a dark shade.This can best be described as

Correct AnswerverifiedShow Answer

The F2 offspring of a classic Mendelian monohybrid cross between homozygous dominant and homozygous recessive parents would produce the genotype(s)

Correct AnswerverifiedShow Answer

If a pea plant shows a recessive phenotype,

Correct AnswerverifiedShow Answer

Which of the following is NOT a trait that is the result of,or is affected by,the interaction of more than one gene?

Correct AnswerverifiedShow Answer

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the first parent?

Correct AnswerverifiedShow Answer

Correct Answer
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The pattern takes the shape of...
View 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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Correct Answer
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Correct Answer
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Correct Answer
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The F₂ offspring of a classic Mendelian monohybrid cross between homozygous dominant and homozygous recessive parents would produce the genotype(s)

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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