Question 1

IF X inactivation fails,problems will result because protein production for sex-linked genes will be too great.

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A)  homologous.
B)  heterozygous.
C)  homozygous.
D)  dominant.
E)  recessivE.F) All of the above
G) B) and E)

Question 3

Uncorrected mistakes during meiosis will lead to

Accepted Answer

A)  production of only autosomes with mutations.
B)  production of only sex chromosomes with mutations.
C)  no living offspring.
D)  no change.
E)  production of gametes with mutated genes.F) None of the above
G) B) and D)

Question 4

If an individual is homozygous for a particular trait

Accepted Answer

A)  each parent contributed a different allele for that trait.
B)  one parent contributed two different alleles for that trait.
C)  each parent contributed the same allele for that trait.
D)  one parent contributed two copies of the same allele for that trait.
E)  a mutation must have occurred.F) C) and E)
G) A) and B)

Question 5

X-linked recessive disorders affect more females than males.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False  False

Question 7

If any of the traits that Mendel worked with were linked genes,his dihybrid crosses

Accepted Answer

A)  would have had different results.
B)  would have produced more offspring.
C)  would have produced fewer offspring.
D)  would have exhibited a typical phenotypic ratio of 9:3:3:1.
E)  would have produced sterile offspring.F) A) and E)
G) All of the above

Question 8

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)  Height is influenced by an X-linked gene.
C)  Height is influenced by environmental changes like improvements in diet.
D)  Height is influenced by a Y-linked gene.
E)  Height is influenced by crossing over.F) A) and B)
G) C) and D)

Question 9

If a diploid cell has 14 chromosomes,it will have

Accepted Answer

A)  14 pairs of homologous chromosomes.
B)  7 pairs of homologous chromatids.
C)  14 pairs of homologous chromatids.
D)  7 pairs of homologous chromosomes.
E)  14 alleles.F) B) and D)
G) A) and B)

Question 10

If a healthy young couple are both carriers of cystic fibrosis,the chance that each of their future children will inherit this serious illness is

Accepted Answer

A)  0%,because cystic fibrosis is not an inherited illness.
B)  25%.
C)  10%.
D)  50%.
E)  100%.F) A) and B)
G) None of the above

Question 11

The pea plant (Pisum sativum) is a good choice for studying heredity because it

Accepted Answer

A)  develops slowly.
B)  produces only a few offspring.
C)  is easy to control which plants mate with each other.
D)  has only a few traits that appear in two easily distinguishable forms.
E)  All answers are correct.F) C) and D)
G) B) and C)

Question 12

In an inherited form of high cholesterol,HH individuals have a blood cholesterol level greater than 500mg/dL,RH individuals are near 300mg/dL,and normal (RR) cholesterol levels should be less than 200mg/dL.The H allele is ___ to the R allele.

Accepted Answer

A)  codominant
B)  dominant
C)  recessive
D)  homozygous
E)  incompletely dominantF) C) and D)
G) B) and C)

Question 13

If the probability of one genetic event is 1/2 and of another 1/6,then the probability of both occurring is 1/2+1/6=2/3.

Accepted Answer

A) True 
 B)False

Question 14

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have round yellow peas? R=round,r=wrinkled,Y=yellow,y=green

Accepted Answer

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

Question 15

Recessive alleles seem to vanish in some generations and reappear in later generations because

Accepted Answer

A)  they cannot be expressed in males.
B)  they are masked by a dominant allele.
C)  they cannot be expressed in females.
D)  they cannot be expressed in successive generations.
E)  they are lost by mutation.F) A) and B)
G) A) and C)

Question 16

When Mendel crossed short (tt) pea plants with short (tt) pea plants the offspring

Accepted Answer

A)  were all tall.
B)  were a mix of tall and short.
C)  were nonexistent.
D)  No answer is correct.
E)  were all short.F) D) and E)
G) B) and E)

Question 17

Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes.

Accepted Answer

A) True 
 B)False  True

Question 18

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R=round,r=wrinkled,Y=yellow,y=green

Accepted Answer

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

Question 19

A man with type A blood and a woman with type B blood have a child with type O blood.What are the genotypes of the man and woman?

Accepted Answer

A)  IA i,and IB i
B)  both are i i
C)  IA IA,and IB IB
D)  IA i,and i i
E)  i i,and IB iF) A) and B)
G) C) and E)

Question 20

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 cells.F) B) and D)
G) A) and E)

Exam 10: Patterns of Inheritance

IF X inactivation fails,problems will result because protein production for sex-linked genes will be too great.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Uncorrected mistakes during meiosis will lead to

Correct AnswerverifiedShow Answer

If an individual is homozygous for a particular trait

Correct AnswerverifiedShow Answer

X-linked recessive disorders affect more females than males.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

If any of the traits that Mendel worked with were linked genes,his dihybrid crosses

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If a diploid cell has 14 chromosomes,it will have

Correct AnswerverifiedShow Answer

If a healthy young couple are both carriers of cystic fibrosis,the chance that each of their future children will inherit this serious illness is

Correct AnswerverifiedShow Answer

The pea plant (Pisum sativum) is a good choice for studying heredity because it

Correct AnswerverifiedShow Answer

In an inherited form of high cholesterol,HH individuals have a blood cholesterol level greater than 500mg/dL,RH individuals are near 300mg/dL,and normal (RR) cholesterol levels should be less than 200mg/dL.The H allele is ___ to the R allele.

Correct AnswerverifiedShow Answer

If the probability of one genetic event is 1/2 and of another 1/6,then the probability of both occurring is 1/2+1/6=2/3.

Correct AnswerverifiedShow Answer

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have round yellow peas? R=round,r=wrinkled,Y=yellow,y=green

Correct AnswerverifiedShow Answer

Recessive alleles seem to vanish in some generations and reappear in later generations because

Correct AnswerverifiedShow Answer

When Mendel crossed short (tt) pea plants with short (tt) pea plants the offspring

Correct AnswerverifiedShow Answer

Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes.

Correct AnswerverifiedTrue

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R=round,r=wrinkled,Y=yellow,y=green

Correct AnswerverifiedA

A man with type A blood and a woman with type B blood have a child with type O blood.What are the genotypes of the man and woman?

Correct AnswerverifiedShow Answer

Linked genes,by definition,are genes that

Correct AnswerverifiedShow Answer

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False

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True

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A

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