Question 1

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

Accepted Answer

A)  Skin color is a polygenic trait
B)  Environmental changes like improvements in diet
C)  Artificial selection
D)  Genetic drift
E)  Crossing overF) A) and C)
G) A) and E)

Question 2

The most common phenotype or allele for a gene in a population is referred to as:

Accepted Answer

A)  The wild type
B)  The dominant population
C)  The recessive population
D)  The P generation
E)  The F1 generationF) A) and D)
G) A) and C)

Question 3

The environment only rarely affects gene expression.

Accepted Answer

A) True 
 B)False

Question 4

Crossing over is more likely to separate genes on a chromosome if they are:

Accepted Answer

A)  Close together
B)  Far apart
C)  Recessive genes
D)  Dominant genes
E)  Mutated genesF) C) and D)
G) None of the above

Question 5

In Huntington disease,a child will typically only get the disease if one parent also has it.It is as common in boys as in girls.This disease is:

Accepted Answer

A)  Autosomal recessive
B)  X-linked recessive
C)  X-linked dominant
D)  Autosomal dominant
E)  PleiotropicF) B) and D)
G) All of the above

Question 6

Traits that depend on more than one gene are:

Accepted Answer

A)  Polygenic
B)  Pleiotropic
C)  Codominant
D)  Recessive
E)  Incomplete dominant traitsF) B) and E)
G) A) and C)

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 allelesE) B) and D)
F) C) and D)

Question 8

A sexual life cycle has two main events: meiosis and gamete formation.

Accepted Answer

A) True 
 B)False

Question 9

Any dihybrid cross should theoretically yield a 3:1 phenotypic ratio.

Accepted Answer

A) True 
 B)False

Question 10

A dihybrid cross is a mating between two individuals that are each ______________ for ___________ gene (genes) .

Accepted Answer

A)  Homozygous, one
B)  Homozygous, two
C)  Homologous, two
D)  Heterozygous, one
E)  Heterozygous, twoF) A) and D)
G) B) and E)

Question 11

Linked genes,by definition,are genes that:

Accepted Answer

A)  Are found on the same chromosome
B)  Have no alleles
C)  Are found in the same species
D)  Have more alleles than usual
E)  Are alleles that are found in different daughter cellsF) B) and D)
G) B) and C)

Question 12

Diagrams of gene order and spacing on chromosomes are:

Accepted Answer

A)  Karyotypes
B)  Phenotypes
C)  Linkage maps
D)  Genotypes
E)  Metabolic mapsF) All of the above
G) A) and B)

Question 13

Average heights of American men and women have increased steadily since the 1940s.What is the best explanation for this observation?

Accepted Answer

A)  Height is a polygenic trait
B)  Artificial selection
C)  Environmental changes like improvements in diet
D)  Genetic drift
E)  Crossing overF) B) and E)
G) A) and E)

Question 14

Thomas Hunt Morgan chose to work with fruit flies in part because they have a short life cycle and large number of offspring.

Accepted Answer

A) True 
 B)False

Question 15

The fact that the two alleles of each gene are packaged into separate gametes; that they move apart from each other during gamete formation is Mendel's:

Accepted Answer

A)  Law of segregation
B)  Law of random fertilization
C)  Law of population dynamics
D)  Law of crossing over
E)  Law of independent assortmentF) A) and B)
G) C) and D)

Question 16

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

Accepted Answer

A)  Tt with TT
B)  Tt with tt
C)  TT with TT.
D)  Tt with tt.
E)  Tt with TtF) A) and B)
G) A) and C)

Question 17

The most common allele for any trait is always the dominant allele.

Accepted Answer

A) True 
 B)False

Question 18

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 allelesE) A) and B)
F) A) and C)

Question 19

If a pea plant is homozygous for yellow seeds (YY) ,which gametes could it produce?

Accepted Answer

A)  Y
B)  Y or y
C)  y
D)  Yy
E)  YYyyF) B) and C)
G) A) and E)

Question 20

Hemophilia A is an X-linked recessive disorder.If a normal man marries a woman who is a carrier,what fraction of their daughters will have hemophilia?

Accepted Answer

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

Exam 10: Patterns of Inheritance

Average heights of American men and women have increased steadily since the 1940s.What is the best explanation for this observation?

Correct AnswerverifiedShow Answer

Diagrams of gene order and spacing on chromosomes are:

Correct AnswerverifiedShow Answer

Linked genes,by definition,are genes that:

Correct AnswerverifiedShow Answer

The fact that the two alleles of each gene are packaged into separate gametes; that they move apart from each other during gamete formation is Mendel's:

Correct AnswerverifiedShow Answer

The most common phenotype or allele for a gene in a population is referred to as:

Correct AnswerverifiedShow Answer

Homologous chromosomes have:

Correct AnswerverifiedShow Answer

Traits that depend on more than one gene are:

Correct AnswerverifiedShow Answer

Hemophilia A is an X-linked recessive disorder.If a normal man marries a woman who is a carrier,what fraction of their daughters will have hemophilia?

Correct AnswerverifiedShow Answer

A sexual life cycle has two main events: meiosis and gamete formation.

Correct AnswerverifiedShow Answer

A dihybrid cross is a mating between two individuals that are each ______________ for ___________ gene (genes) .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Any dihybrid cross should theoretically yield a 3:1 phenotypic ratio.

Correct AnswerverifiedShow Answer

If a pea plant is homozygous for yellow seeds (YY) ,which gametes could it produce?

Correct AnswerverifiedShow Answer

Crossing over is more likely to separate genes on a chromosome if they are:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A single chromosome has:

Correct AnswerverifiedShow Answer

The most common allele for any trait is always the dominant allele.

Correct AnswerverifiedShow Answer

The environment only rarely affects gene expression.

Correct AnswerverifiedShow Answer

In Huntington disease,a child will typically only get the disease if one parent also has it.It is as common in boys as in girls.This disease is:

Correct AnswerverifiedShow Answer

Thomas Hunt Morgan chose to work with fruit flies in part because they have a short life cycle and large number of offspring.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A dihybrid cross is a mating between two individuals that are each ____ for _ gene (genes) .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified