Question 1

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.

Question 2

Genotypes are the outward expression of an allele combination.

Accepted Answer

A) True 
 B)False

Question 3

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.

Question 4

Mendel's monohybrid cross of tall parents with the genotype Tt resulted in a tall to short ratio of

Accepted Answer

A)  1:1.
B)  1:2.
C)  2:1.
D)  3:1.
E)  1:3.

Question 5

In cystic fibrosis,two unaffected carriers can have a child with the disease.It is as common in boys as in girls.This disease is

Accepted Answer

A)  autosomal dominant.
B)  X-linked recessive.
C)  autosomal recessive.
D)  X-linked dominant.
E)  pleiotropic.

Question 6

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 7

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

Accepted Answer

A) True 
 B)False

Question 8

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 genes.

Question 9

In the section "Investigating Life: Heredity and the Hungry Hordes",what did the researchers conclude from the data in the figure?

Accepted Answer

A)  that resistance to Bt toxin is dominant
B)  that the number of larvae is dependent on treatment with Bt toxin
C)  that resistance to Bt toxin is recessive
D)  that the size of larvae is dependent on treatment with Bt toxin
E)  that resistance to Bt toxin is not genetic

Question 10

Having the alleles Tt is

Accepted Answer

A)  a phenotype.
B)  linkage.
C)  a genotype.
D)  a gene.
E)  a loci.

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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.

Question 13

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.

Question 14

If a pea plant is heterozygous for yellow seeds (Yy) ,which gametes will it produce?

Accepted Answer

A)  Y only
B)  Y or y
C)  y only
D)  Yy
E)  YYyy

Question 15

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

Accepted Answer

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

Question 16

In pedigree charts,autosomal recessive disorders typically

Accepted Answer

A)  appear in every generation.
B)  appear only in males.
C)  appear only in females.
D)  seem to disappear in one generation,only to reappear in the next generation.
E)  occur every third generation.

Question 17

Two alleles of each gene are packaged into separate gametes and they move apart from each other during gamete formation summarizes 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 assortment.

Question 18

The genotypes shown in the figure are for a recessive genetic disorder.

Accepted Answer

A) True 
 B)False

Question 19

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,two

Question 20

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.

Exam 10: Patterns of Inheritance

Mendel's monohybrid cross of tall parents with the genotype Tt resulted in a tall to short ratio of

Correct AnswerverifiedShow Answer

In cystic fibrosis,two unaffected carriers can have a child with the disease.It is as common in boys as in girls.This disease is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If a pea plant is heterozygous for yellow seeds (Yy) ,which gametes will it produce?

Correct AnswerverifiedShow Answer

In pedigree charts,autosomal recessive disorders typically

Correct AnswerverifiedShow Answer

Two alleles of each gene are packaged into separate gametes and they move apart from each other during gamete formation summarizes Mendel's

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Uncorrected mistakes during meiosis will lead to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Genotypes are the outward expression of an allele combination.

Correct AnswerverifiedShow Answer

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

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

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

Correct AnswerverifiedShow Answer

In the section "Investigating Life: Heredity and the Hungry Hordes",what did the researchers conclude from the data in the figure?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The genotypes shown in the figure are for a recessive genetic disorder.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Having the alleles Tt is

Correct AnswerverifiedShow Answer

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

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