Question 1

During meiosis,each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles.This statement corresponds to

Accepted Answer

A)  the rule of multiplication. 
B)  the law of segregation. 
C)  the law of probability. 
D)  gene theory. 
E)  the law of independent assortment. 
A)  the rule of multiplication. 
B)  the law of segregation. 
C)  the law of probability. 
D)  gene theory. 
E)  the law of independent assortment.

Question 2

Which of the following is NOT a correct match?

Accepted Answer

A)  pollen - male 
B)  stigma - female 
C)  anther - female 
D)  ovule - female 
E)  ovary - female 
A)  pollen - male 
B)  stigma - female 
C)  anther - female 
D)  ovule - female 
E)  ovary - female

Question 3

The garden pea was a good model for Mendel's genetics experiments.Which of the following is NOT true regarding this model organism?

Accepted Answer

A)  The plants were easy to grow. 
B)  Pea plants can either cross-pollinate or self-pollinate. 
C)  There was only one variety of pea available to Mendel. 
D)  The plants had several traits that were easily identified. 
E)  Most of the traits studied had no intermediate stage. 
A)  The plants were easy to grow. 
B)  Pea plants can either cross-pollinate or self-pollinate. 
C)  There was only one variety of pea available to Mendel. 
D)  The plants had several traits that were easily identified. 
E)  Most of the traits studied had no intermediate stage.

Question 4

A man with blood type A and a woman with blood type B can have a baby with blood type O blood.

Accepted Answer

A)  True, because A and B are the dominant blood types and both individuals could carry a type O allele. 
B)  False, the child must have type AB blood. 
C)  True, because A and B are codominant. 
D)  False, because Type A and B are dominant blood types and these individuals cannot have an offspring with the recessive blood type. 
E)  True, because only 1 O allele is needed. 
A)  True, because A and B are the dominant blood types and both individuals could carry a type O allele. 
B)  False, the child must have type AB blood. 
C)  True, because A and B are codominant. 
D)  False, because Type A and B are dominant blood types and these individuals cannot have an offspring with the recessive blood type. 
E)  True, because only 1 O allele is needed.

Question 5

Which of the following is true about an individual with the chromosomes shown in this figure?

Accepted Answer

A)  All offspring will have the dominant phenotype for each trait. 
B)  All offspring will have the recessive phenotype for each trait. 
C)  A maximum of four different gametes are possible with four traits. 
D)  The individual is heterozygous for all traits. 
E)  The individual is homozygous for at least one trait. 
A)  All offspring will have the dominant phenotype for each trait. 
B)  All offspring will have the recessive phenotype for each trait. 
C)  A maximum of four different gametes are possible with four traits. 
D)  The individual is heterozygous for all traits. 
E)  The individual is homozygous for at least one trait.

Question 6

If a true-breeding tall pea plant is crossed with a tall pea plant of unknown parentage.Which of the following is correct?

Accepted Answer

A)  All of the offspring (F1) will be short. 
B)  Over several generations, no short individuals will appear. 
C)  Some short individuals may appear in the F2 generation. 
D)  It is impossible to determine based on the information provided. 
E)  Some of the F1 generation will be short. 
A)  All of the offspring (F1) will be short. 
B)  Over several generations, no short individuals will appear. 
C)  Some short individuals may appear in the F2 generation. 
D)  It is impossible to determine based on the information provided. 
E)  Some of the F1 generation will be short.

Question 7

Which of the following is TRUE?

Accepted Answer

A)  Females can be heterozygous for sex-linked traits. 
B)  All traits on the sex chromosomes are associated with sexual development. 
C)  Males are heterozygous for the SRY gene. 
D)  The X and Y chromosomes are homologous. 
E)  Men pass their X-linked traits to their sons. 
A)  Females can be heterozygous for sex-linked traits. 
B)  All traits on the sex chromosomes are associated with sexual development. 
C)  Males are heterozygous for the SRY gene. 
D)  The X and Y chromosomes are homologous. 
E)  Men pass their X-linked traits to their sons.

Question 8

A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila.What proportion of the female offspring will have white eyes?

Accepted Answer

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

Question 9

Martha has widow's peak and attached earlobes.Martha's dad had a straight hairline and unattached earlobes.If Martha marries a man that is heterozygous for both traits,what is the probability that they will have a child with a widow's peak and attached earlobes?

Accepted Answer

A)  1/16 
B)  1/8 
C)  1/4 
D)  1/2 
E)  3/4 
A)  1/16 
B)  1/8 
C)  1/4 
D)  1/2 
E)  3/4

Question 10

Morgan breeds and sells snakes.He knows that he can make the most money by breeding and selling albino snakes.Albinism is a recessive trait.His female albino corn snake just produced six offspring.Two displayed normal coloration and four were albino.What do you know about the genotype of the father?

Accepted Answer

A)  He must be homozygous dominant. 
B)  He must be heterozygous. 
C)  He must be homozygous recessive. 
D)  He could be either heterozygous or homozygous dominant. 
E)  There is not enough information to determine the father's genotype. 
A)  He must be homozygous dominant. 
B)  He must be heterozygous. 
C)  He must be homozygous recessive. 
D)  He could be either heterozygous or homozygous dominant. 
E)  There is not enough information to determine the father's genotype.

Question 11

Which of the following is incorrectly matched?

Accepted Answer

A)  physical expression of a trait - phenotype 
B)  allele that masks expression of alternate allele - dominant 
C)  identical alleles - homologous 
D)  allele whose expression can be masked by an alternate allele - recessive 
E)  the specific alleles that an individual has - genotype 
A)  physical expression of a trait - phenotype 
B)  allele that masks expression of alternate allele - dominant 
C)  identical alleles - homologous 
D)  allele whose expression can be masked by an alternate allele - recessive 
E)  the specific alleles that an individual has - genotype

Question 12

The distance between the alleles for one trait and the alleles for a second trait is called the

Accepted Answer

A)  map units. 
B)  gap distance. 
C)  dominant distance. 
D)  gene locus. 
E)  gaps. 
A)  map units. 
B)  gap distance. 
C)  dominant distance. 
D)  gene locus. 
E)  gaps.

Question 13

If a heterozygous dominant tall pea plant is crossed with a short pea plant,what is the expected phenotypic ratio of tall:short plants?

Accepted Answer

A)  1:1 
B)  1:2 
C)  3:1 
D)  all tall 
E)  all short 
A)  1:1 
B)  1:2 
C)  3:1 
D)  all tall 
E)  all short

Question 14

Amy has wavy hair and 6 fingers (an autosomal dominant trait).Which of the following combinations are possible for her parents?

Accepted Answer

A)  5 only 
B)  1 and 2 
C)  1, 3, and 4 
D)  2, 4, and 5 
E)  2 and 4 
A)  5 only 
B)  1 and 2 
C)  1, 3, and 4 
D)  2, 4, and 5 
E)  2 and 4

Question 15

Alleles are

Accepted Answer

A)  dominant traits. 
B)  recessive traits. 
C)  2 versions of the same trait. 
D)  alternate versions of the same trait. 
E)  exact copies of the same trait. 
A)  dominant traits. 
B)  recessive traits. 
C)  2 versions of the same trait. 
D)  alternate versions of the same trait. 
E)  exact copies of the same trait.

Question 16

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

Question 17

In a one-trait test cross,the phenotype that disappears in the F1 generation is the

Accepted Answer

A)  dominant trait. 
B)  negative trait. 
C)  recessive trait. 
D)  heterozygote. 
E)  homozygote. 
A)  dominant trait. 
B)  negative trait. 
C)  recessive trait. 
D)  heterozygote. 
E)  homozygote.

Question 18

Which of the following is NOT true about blood types?

Accepted Answer

A)  IA represents antigen A on red blood cells. 
B)  A person with AB blood has two different antigens on his red blood cells. 
C)  The allele representing blood type O is recessive. 
D)  This is an example of a multiple allele trait and an individual can have up to 3 different alleles. 
E)  Blood types exhibit codominance and are also an example of a multiple allele trait. 
A)  IA represents antigen A on red blood cells. 
B)  A person with AB blood has two different antigens on his red blood cells. 
C)  The allele representing blood type O is recessive. 
D)  This is an example of a multiple allele trait and an individual can have up to 3 different alleles. 
E)  Blood types exhibit codominance and are also an example of a multiple allele trait.

Question 19

Which feature is found among an autosomal recessive pedigree?

Accepted Answer

A)  Heterozygotes have a normal phenotype. 
B)  Affected children will have at least one affected parent. 
C)  Heterozygotes are affected. 
D)  Both males and females are affected with equal frequency. 
E)  The trait is carried on the Y chromosome. 
A)  Heterozygotes have a normal phenotype. 
B)  Affected children will have at least one affected parent. 
C)  Heterozygotes are affected. 
D)  Both males and females are affected with equal frequency. 
E)  The trait is carried on the Y chromosome.

Question 20

Sickle cell disease is caused by a single mutation in the DNA of a particular gene.A person with this disease has red blood cells that lose their original donut shape and form a sickle shape.People with this disorder suffer from low energy levels,blood clots,and strokes.This is an example of

Accepted Answer

A)  a multifactorial trait. 
B)  polygenic inheritance. 
C)  pleiotropy. 
D)  codominance. 
E)  incomplete dominance. 
A)  a multifactorial trait. 
B)  polygenic inheritance. 
C)  pleiotropy. 
D)  codominance. 
E)  incomplete dominance.

Exam 10: Patterns of Inheritance

During meiosis,each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles.This statement corresponds to

Which of the following is NOT a correct match?

The garden pea was a good model for Mendel's genetics experiments.Which of the following is NOT true regarding this model organism?

A man with blood type A and a woman with blood type B can have a baby with blood type O blood.

Which of the following is true about an individual with the chromosomes shown in this figure?

If a true-breeding tall pea plant is crossed with a tall pea plant of unknown parentage.Which of the following is correct?

Which of the following is TRUE?

A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila.What proportion of the female offspring will have white eyes?

Martha has widow's peak and attached earlobes.Martha's dad had a straight hairline and unattached earlobes.If Martha marries a man that is heterozygous for both traits,what is the probability that they will have a child with a widow's peak and attached earlobes?

Which of the following is incorrectly matched?

The distance between the alleles for one trait and the alleles for a second trait is called the

If a heterozygous dominant tall pea plant is crossed with a short pea plant,what is the expected phenotypic ratio of tall:short plants?

Amy has wavy hair and 6 fingers (an autosomal dominant trait).Which of the following combinations are possible for her parents?

Alleles are

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?

In a one-trait test cross,the phenotype that disappears in the F1 generation is the

Which of the following is NOT true about blood types?

Which feature is found among an autosomal recessive pedigree?

Sickle cell disease is caused by a single mutation in the DNA of a particular gene.A person with this disease has red blood cells that lose their original donut shape and form a sickle shape.People with this disorder suffer from low energy levels,blood clots,and strokes.This is an example of

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