Question 1

If you cross two heterozygous (Yy) pea plants,what proportion of the offspring will be heterozygous?

Accepted Answer

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

Question 2

The segregation of alleles for a gene on one chromosome does not influence the segregation of alleles for a gene on another chromosome during gamete formation is Mendel's

Accepted Answer

A)  law of independent assortment.
B)  law of random fertilization.
C)  law of population dynamics.
D)  law of crossing over.
E)  law of segregation.

Question 3

Which gametes can a RRyy plant produce?

Accepted Answer

A)  RR or yy
B)  Ry
C)  RY or ry
D)  RRyy
E)  R or y

Question 4

On a diagram of linked genes on a chromosome,the distance between the genes shows the physical distance of the chromosome as well as the frequency of crossing over.

Accepted Answer

A) True 
 B)False

Question 5

A person has a recessive allele for a disease but the allele is masked by the presence of a normal dominant allele in the person.This person

Accepted Answer

A)  is homozygous for the disease.
B)  cannot produce gametes.
C)  is termed a carrier.
D)  is termed a linkage group.
E)  has the disease but cannot pass this disease to their offspring.

Question 6

If all the offspring show the dominant phenotype in a test cross,then the individual with the unknown genotype was

Accepted Answer

A)  heterozygous.
B)  homozygous dominant.
C)  homozygous recessive.
D)  a clone of the other test cross individual.
E)  heterozygous recessivE.

Question 7

Homologous chromosomes have

Accepted Answer

A)  the same genes but can have different alleles.
B)  the same genes and alleles.
C)  different genes and alleles.
D)  different genes,but can have the same alleles.

Question 8

A portion of DNA that encodes a specific protein is

Accepted Answer

A)  a gene.
B)  a chromosome.
C)  a chromatid.
D)  a centromere.
E)  a kinetochorE.

Question 9

To inherit an autosomal recessive disorder requires the person receive the disease causing allele from

Accepted Answer

A)  the father only.
B)  the mother only.
C)  only the parent having the disease.
D)  only one parent who is homozygous recessive for the disease.
E)  both parents.

Question 10

A single chromosome has

Accepted Answer

A)  multiple genes each with a single allele.
B)  multiple genes each with multiple alleles.
C)  a single gene with a single allele.
D)  a single gene with multiple alleles.
E)  No answer is correct.

Question 11

Mendel called a masking trait

Accepted Answer

A)  dominant.
B)  recessive.
C)  homologous.
D)  homozygous.
E)  heterozygous.

Question 12

The wide variation in skin color in humans is best explained by

Accepted Answer

A)  Skin color is a polygenic trait.
B)  Skin color is influenced by environmental changes like improvements in diet.
C)  Skin color is influenced by an X-linked gene.
D)  Skin color is influenced by a Y-linked gene.
E)  Skin color is influenced by crossing over.

Question 13

Diagrams of gene order and spacing on chromosomes are

Accepted Answer

A)  genotypes and phenotypes.
B)  phenotypes.
C)  linkage maps.
D)  genotypes.
E)  metabolic maps.

Question 14

A gene that affects flower color,root length,and leaf shape is pleiotropic.

Accepted Answer

A) True 
 B)False

Question 15

If the two alleles for a particular gene are identical the gene pair is

Accepted Answer

A)  homozygous.
B)  homologous.
C)  heterozygous.
D)  dominant.
E)  recessivE.

Question 16

If a scientist wants to perform a monohybrid cross for stem length in pea plants,which of the following crosses should be performed?

Accepted Answer

A)  Tt x TT
B)  Tt x tt
C)  TT x TT
D)  Tt x tt.
E)  Tt x Tt

Question 17

In the ABO blood type system,there are six possible genotypes,but only two possible phenotypes.

Accepted Answer

A) True 
 B)False

Question 18

Females who are "carriers" for hemophilia

Accepted Answer

A)  theoretically pass the allele for hemophilia to half of their offspring.
B)  theoretically pass the allele for hemophilia to half of their daughters who become at least "carriers" for this disorder.
C)  All answers are correct.
D)  theoretically pass the allele for hemophilia to half of their sons who become hemophiliacs.
E)  usually do not show any symptoms of hemophilia.

Question 19

If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation,the counselor would assume that the disease was caused by

Accepted Answer

A)  a new reoccurring mutation.
B)  an autosomal recessive disorder.
C)  a chromosomal abnormality.
D)  an autosomal dominant disorder.
E)  having an extra set of chromosomes.

Question 20

Which gametes can a RrYy plant produce?

Accepted Answer

A)  Rr or Yy
B)  RY or ry
C)  RrYy
D)  RY,Ry,rY,or ry
E)  R or r

Exam 10: Patterns of Inheritance

If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation,the counselor would assume that the disease was caused by

Correct AnswerverifiedShow Answer

Mendel called a masking trait

Correct AnswerverifiedShow Answer

A gene that affects flower color,root length,and leaf shape is pleiotropic.

Correct AnswerverifiedShow Answer

If a scientist wants to perform a monohybrid cross for stem length in pea plants,which of the following crosses should be performed?

Correct AnswerverifiedShow Answer

A portion of DNA that encodes a specific protein is

Correct AnswerverifiedShow Answer

If the two alleles for a particular gene are identical the gene pair is

Correct AnswerverifiedShow Answer

If all the offspring show the dominant phenotype in a test cross,then the individual with the unknown genotype was

Correct AnswerverifiedShow Answer

On a diagram of linked genes on a chromosome,the distance between the genes shows the physical distance of the chromosome as well as the frequency of crossing over.

Correct AnswerverifiedShow Answer

Homologous chromosomes have

Correct AnswerverifiedShow Answer

A person has a recessive allele for a disease but the allele is masked by the presence of a normal dominant allele in the person.This person

Correct AnswerverifiedShow Answer

The segregation of alleles for a gene on one chromosome does not influence the segregation of alleles for a gene on another chromosome during gamete formation is Mendel's

Correct AnswerverifiedShow Answer

Which gametes can a RrYy plant produce?

Correct AnswerverifiedShow Answer

Females who are "carriers" for hemophilia

Correct AnswerverifiedShow Answer

A single chromosome has

Correct AnswerverifiedShow Answer

The wide variation in skin color in humans is best explained by

Correct AnswerverifiedShow Answer

Diagrams of gene order and spacing on chromosomes are

Correct AnswerverifiedShow Answer

In the ABO blood type system,there are six possible genotypes,but only two possible phenotypes.

Correct AnswerverifiedShow Answer

If you cross two heterozygous (Yy) pea plants,what proportion of the offspring will be heterozygous?

Correct AnswerverifiedShow Answer

To inherit an autosomal recessive disorder requires the person receive the disease causing allele from

Correct AnswerverifiedShow Answer

Which gametes can a RRyy plant produce?

Correct AnswerverifiedShow Answer

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