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Multiple Choice Quiz

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
Which of the following statements is incorrect.
A)A feature, such as stature, may be the result of the action of several genes.
B)Genes may be expressed differently in males and females.
C)Genes always exist in two forms or alleles.
D)It is possible to have inherited a particular allele which is not expressed in the phenotype.
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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