Question 1

The individual sometimes referred to as the "father of genetics" because he influenced the science of genetics more than anyone else is Gregor Mendel.

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A)  genetic drift 
B)  environmental changes like improvements in diet 
C)  artificial selection 
D)  Height is a polygenic trait. 
E)  crossing over 
A)  genetic drift 
B)  environmental changes like improvements in diet 
C)  artificial selection 
D)  Height is a polygenic trait. 
E)  crossing over

Question 3

If an individual is heterozygous for a particular trait,

Accepted Answer

A)  one parent contributed two copies of the same allele for that trait. 
B)  each parent contributed a different allele for that trait. 
C)  each parent contributed the same allele for that trait. 
D)  one parent contributed two different alleles for that trait. 
A)  one parent contributed two copies of the same allele for that trait. 
B)  each parent contributed a different allele for that trait. 
C)  each parent contributed the same allele for that trait. 
D)  one parent contributed two different alleles for that trait.

Question 4

When Mendel crossed tall (Tt)plants with tall plants of the same genotype,the offspring

Accepted Answer

A)  were always a mix of short and tall. 
B)  were always short. 
C)  did not grow and reproduce, because they were separate species. 
D)  were always tall. 
E)  were a variable mix of tall and short. 
A)  were always a mix of short and tall. 
B)  were always short. 
C)  did not grow and reproduce, because they were separate species. 
D)  were always tall. 
E)  were a variable mix of tall and short.

Question 5

When the frequencies of all the phenotypes associated with a polygenic trait are plotted on a graph,they form a characteristic bell-shaped curve.

Accepted Answer

A) True 
 B)False

Question 6

A male expresses an X-linked recessive disorder only if he inherits alleles conferring the disorder from both parents.

Accepted Answer

A) True 
 B)False

Question 7

Apart from natural variation in a species,due to alternate alleles,abnormality (or disease)disorders are also of interest.Inheritance of autosomal dominant disorders requires ___ to pass on the allele,while inheritance of autosomal recessive disorders requires ___ to pass on the allele for it to be expressed in the offspring.

Accepted Answer

A)  only the father; only the mother 
B)  All of the answer choices are correct. 
C)  only the mother's X chromosome; only the father's Y chromosome 
D)  either the mother or the father; both the mother and the father 
E)  the parent who has the disorder; the parent who is a carrier for the disorder 
A)  only the father; only the mother 
B)  All of the answer choices are correct. 
C)  only the mother's X chromosome; only the father's Y chromosome 
D)  either the mother or the father; both the mother and the father 
E)  the parent who has the disorder; the parent who is a carrier for the disorder

Question 8

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

Accepted Answer

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

Question 9

In a testcross,if all the offspring show the dominant phenotype,then the individual with the unknown genotype was

Accepted Answer

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

Question 10

Figuer:
Examine this image of chromosomes and identify the structural components.  
-A portion (location)of DNA that encodes a specific protein is a

Accepted Answer

A)  chromatid. 
B)  chromosome. 
C)  centromere. 
D)  kinetochore. 
E)  gene. 
A)  chromatid. 
B)  chromosome. 
C)  centromere. 
D)  kinetochore. 
E)  gene.

Question 11

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

Accepted Answer

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

Question 12

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

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

In the biology lab,you observed that your lab partner's blood type is AB.The placement of the A and B molecules on each cell is controlled by proteins,coded by different versions of the same gene.Having both is an example of

Accepted Answer

A)  independent assortment. 
B)  recessive inheritance. 
C)  incomplete dominance. 
D)  codominant inheritance. 
E)  dominant inheritance. 
A)  independent assortment. 
B)  recessive inheritance. 
C)  incomplete dominance. 
D)  codominant inheritance. 
E)  dominant inheritance.

Question 15

Alternate forms (the DNA sequences indicated by alphabetic abbreviations)of the same gene are called

Accepted Answer

A)  centromeres. 
B)  chromosomes. 
C)  chromatids. 
D)  alleles. 
E)  traits. 
A)  centromeres. 
B)  chromosomes. 
C)  chromatids. 
D)  alleles. 
E)  traits.

Question 16

Hemophilia A is a(n)

Accepted Answer

A)  X-linked dominant disorder causing a defective blood clotting protein. 
B)  X-linked dominant disorder. 
C)  X-linked recessive disorder causing a defective blood clotting protein. 
D)  defective blood clotting protein. 
E)  X-linked recessive disorder. 
A)  X-linked dominant disorder causing a defective blood clotting protein. 
B)  X-linked dominant disorder. 
C)  X-linked recessive disorder causing a defective blood clotting protein. 
D)  defective blood clotting protein. 
E)  X-linked recessive disorder.

Question 17

Genotype means

Accepted Answer

A)  the number of chromosomes in an individual. 
B)  the observable expression of the genes in an individual. 
C)  the genes an individual has. 
D)  the number of gametes in an individual. 
E)  the combination of alleles in an individual. 
A)  the number of chromosomes in an individual. 
B)  the observable expression of the genes in an individual. 
C)  the genes an individual has. 
D)  the number of gametes in an individual. 
E)  the combination of alleles in an individual.

Question 18

If you,like Mendel,grow plants in the lab,and cross short (tt)pea plants with short pea plants,the offspring will be

Accepted Answer

A)  None of the answer choices are correct. 
B)  all tall. 
C)  a mix of tall and short. 
D)  nonexistent. 
E)  all short. 
A)  None of the answer choices are correct. 
B)  all tall. 
C)  a mix of tall and short. 
D)  nonexistent. 
E)  all short.

Question 19

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

Accepted Answer

A) True 
 B)False

Exam 10: Patterns of Inheritance

The individual sometimes referred to as the "father of genetics" because he influenced the science of genetics more than anyone else is Gregor Mendel.

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

If an individual is heterozygous for a particular trait,

When Mendel crossed tall (Tt)plants with tall plants of the same genotype,the offspring

When the frequencies of all the phenotypes associated with a polygenic trait are plotted on a graph,they form a characteristic bell-shaped curve.

A male expresses an X-linked recessive disorder only if he inherits alleles conferring the disorder from both parents.

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

In a testcross,if all the offspring show the dominant phenotype,then the individual with the unknown genotype was

Figuer: Examine this image of chromosomes and identify the structural components. -A portion (location)of DNA that encodes a specific protein is a

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

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

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

In the biology lab,you observed that your lab partner's blood type is AB.The placement of the A and B molecules on each cell is controlled by proteins,coded by different versions of the same gene.Having both is an example of

Alternate forms (the DNA sequences indicated by alphabetic abbreviations)of the same gene are called

Hemophilia A is a(n)

Genotype means

If you,like Mendel,grow plants in the lab,and cross short (tt)pea plants with short pea plants,the offspring will be

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

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