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Multiple Choice Quiz
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1

Polymorphism refers to:
A)the presence of several distinct forms of a gene within a population
B)a trait in which two alleles are co-dominant
C)a single gene that affects multiple aspects of the phenotype
D)many genes that affect a single aspect of the phenotype
2

A mother of known blood type A has a child whose blood turns out to be B. From this it follows that the mother:
A)must really have the blood type AB
B)is heterozygous for the trait
C)is homozygous dominant for the trait
D)could have several possible genotypes
3

The Rh blood-type system:
A)is inherited independently of the ABO blood-type system
B)is polymorphic like the ABO blood-type system
C)can cause complications when an Rh-negative mother carries an Rh-positive fetus
D)all of the above
4

Phenylketonuria:
A)is inherited as a recessive
B)is inherited as a dominant
C)involves an error in metabolism
D)A and C
E)B and C
5

Achondroplastic dwarfism is inherited as a dominant. Which of the following statements about the inheritance of dwarfism is false:
A)A person who is heterozygous for this trait would be a dwarf.
B)A person who is homozygous recessive for this trait would not be a dwarf.
C)A mating between two non-dwarfs has a one in four probability of producing a dwarf child.
D)All dwarf children must have at least one parent who is also a dwarf.
6

Nondisjunction:
A)leads to abnormal chromosome numbers
B)generally occurs during mitosis
C)happens extremely rarely
D)all of the above
7

Sickle-cell anemia:
A)involves an error in metabolism
B)is a hemoglobin abnormality
C)is caused by nondisjunction
D)is an X-linked trait
8

Individuals with an abnormal number of sex chromosomes:
A)rarely survive to adulthood
B)are always phenotypically female
C)often show abnormal sex organs and are sterile
D)all of the above
9

If only one partner tests positive as a carrier of Tay-Sachs disease, the probability that they will have a child with the disease is:
A)0
B)½
C)¼
D)¾
10

A gene is:
A)determined by the study of linkage groups
B)another name for a codon
C)a segment of the DNA molecule recognizable by its specific function
D)composed of proteins





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