Question 1

If a child belongs to blood type O, he or she could NOT have been produced by which set of parents?

Accepted Answer

A)  type A mother and type B father 
B)  type A mother and type O father 
C)  type AB mother and type O father 
D)  type O mother and type O father 
E)  type AB mother and type B father

Question 2

If tall ( D ) is dominant to dwarf ( d ), and two homozygous varieties DD and dd are crossed, then what kind of progeny will be produced?

Accepted Answer

A)  all intermediate forms 
B)  all tall 
C)  all dwarf 
D)  1/2 tall, 1/2 dwarf 
E)  3/4 tall, 1/4 dwarf

Question 3

Purple flower ( A ) is dominant over white flower ( a ), and tall stem ( B ) is dominant over short stem ( b ). The Punnett square represents a cross between two dihybrids ( AaBb ´ AaBb ). Examine the figure above, and answer the following question(s). In the figure above, how many plants would have white flowers and short stems?

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  9 
E)  16

Question 4

The mutation that causes the lighter skin color of all people of European descent was the result of what type of mutation?

Accepted Answer

A)  base-pair substitution 
B)  insertion 
C)  deletion 
D)  whole chromosome duplication 
E)  multiple gene mutations involving several mechanisms

Question 5

Huntington's disease is a dominant autosomal genetic disorder. Albert has Huntington's disease as did his mother. His father was normal. Albert is married to Lydia who does not have Huntington's disease. If Albert and Lydia have a child, what is the probability that their child will have Huntington's disease?

Accepted Answer

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

Question 6

For this problem, you may want to create a Punnett Square on a separate piece of paper. Assume brown eyes are dominant to blue eyes and dimples are dominant to no dimples. John has brown eyes and his mother has blue eyes. John does not have dimples. Zena has blue eyes and also has no dimples. What are the chances if this couple have children, they will produce a child with blue eyes and no dimples?

Accepted Answer

A)  0 
B)  1/4 
C)  1/2 
D)  3/4 
E)  there is not enough information provided to solve this problem

Question 7

A couple have a child with Tay-Sachs disease. What is (are) their genotype(s)?

Accepted Answer

A)  both are heterozygous 
B)  one is homozgous dominant and the other is homozgous recessive 
C)  both are homozygous dominant 
D)  both are homozygous recessive 
E)  more than one of these is possible

Question 8

Most human traits show continuous variation. This is most likely the result of

Accepted Answer

A)  pleiotropy. 
B)  incomplete dominance. 
C)  epistasis. 
D)  environmental effects. 
E)  all of these.

Question 9

An X-linked carrier is a

Accepted Answer

A)  homozygous dominant female. 
B)  heterozygous female. 
C)  homozygous recessive female. 
D)  homozygous male. 
E)  heterozygous male.

Question 10

In a person with cystic fibrosis, the mutation causes which of the following to happen?

Accepted Answer

A)  the protein clings to the inner surface of the plasma membrane 
B)  the protein never leaves the endoplasmic reticulum 
C)  the protein is shuttled to the nuclear membrane instead of the plasma membrane 
D)  the protein is shuttled to the plasma membrane instead of the nuclear membrane 
E)  the protein is expelled from the cell by exocytosis before it can do its job

Question 11

In incomplete dominance,

Accepted Answer

A)  one allele is not dominant to another allele. 
B)  the genotype can be determined by the phenotype. 
C)  the heterozygote is somewhat intermediate to the two homozygotes. 
D)  the intermediate phenotype may be the result of enzyme insufficiency. 
E)  all of these are true.

Question 12

PKU is a human disease in which the affected individual is unable to metabolize the amino acid, phenylalanine. Symptoms of this disease include mental retardation, a lack of pigmentation, and black urine. PKU is an example of

Accepted Answer

A)  epistasis. 
B)  pleiotropy. 
C)  incomplete dominance. 
D)  co-dominance. 
E)  complete dominance.

Question 13

In a person who does NOT have cystic fibrosis, what is the related normal condition?

Accepted Answer

A)  mucus slides easily over epithelial surfaces and can more easily be expelled 
B)  osmotic balance in tissues is maintained by pumping sodium out of cells and chloride into cells 
C)  pH balances are maintained by pH buffers, mainly the bicarbonate ion 
D)  muscle fibers contract in coordination allowing smooth whole muscle contractions 
E)  plasma membranes function properly to allow nonpolar molecules to diffuse into and out of the cells

Question 14

In rabbits, black coat is dominant to white coat. A testcross was performed between black rabbits and white rabbits. In the litter of kits (baby rabbits) that resulted 10 were black and 2 were white. What is the genotype of the black rabbit parent?

Accepted Answer

A)  homozygous dominant 
B)  heterozygous 
C)  homozygous recessive 
D)  none of these are the parental genotype of the black rabbit 
E)  impossible to determine the genotype based on the information provided

Question 15

Purple flower ( A ) is dominant over white flower ( a ), and tall stem ( B ) is dominant over short stem ( b ). The Punnett square represents a cross between two dihybrids ( AaBb ´ AaBb ). Examine the figure above, and answer the following question(s). In the figure above, what would be the genotype of plant #9?

Accepted Answer

A)  Aabb 
B)  aaBb 
C)  AaBB 
D)  AABB 
E)  aaBB

Question 16

If a homozygous dominant long-haired dog is crossed with a homozygous recessive short-haired dog, what will be the phenotype of the offspring?

Accepted Answer

A)  all heterozygous 
B)  half homozygous dominant and half homozygous recessive 
C)  all red 
D)  half red and half white 
E)  more than one of these

Question 17

Human eye color is an example of a trait that

Accepted Answer

A)  varies according to the geographical area. 
B)  varies periodically. 
C)  varies according to humidity. 
D)  varies continuously. 
E)  varies according to seasons.

Question 18

Which of the following processes is closely associated with the normal functioning of the "cystic fibrosis" gene?

Accepted Answer

A)  water osmosis 
B)  sodium - chloride pumping 
C)  protein diffusion 
D)  pH regulation 
E)  polypeptide packaging

Question 19

Which of the following was the dominant theory of inheritance before Mendel?

Accepted Answer

A)  blending of traits 
B)  acquired characteristics 
C)  natural selection 
D)  spontaneous appearance 
E)  paternal dominance

Question 20

Which of the following is TRUE about cystic fibrosis?

Accepted Answer

A)  there is no cure 
B)  1 in 25 people carry the cystic fibrosis mutation 
C)  1 in 3,300 people have the disease 
D)  cystic fibrosis patients do not live longer than 30 years 
E)  all of these are true

Exam 9: Patterns of Inheritance