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1
Eliminating a specific human genetic disease is difficult if not impossible because
A)most diseases are caused by dominant alleles.
B)mutation rates are high.
C)immigration introduces new alleles.
D)controlling reproductive behavior is difficult.
2
Which of the following is true concerning recessive alleles?
A)Recessive alleles are always present in a population at a lower frequency than dominant alleles.
B)Uncommon traits are the expression of recessive alleles and common traits are the expression of dominant alleles.
C)Beneficial traits are the expression of dominant alleles and deleterious traits are the expression of recessive alleles.
D)Recessive traits can be common or uncommon; beneficial or deleterious.
3
Q: In one human population the allele for blood type O comprises 95% of all alleles for blood type. This statement expresses the concept of
A)allele frequency.
B)gene pool.
C)local population.
D)eugenics.
4
Variety is to plant as ________ is to bacteria.
A)species
B)strain
C)race
D)clone
5
Which one of the following encourages the maintenance of a local population?
A)migration
B)geographic barriers
C)mutations
D)hybrid crosses
6
Which of the following is least likely to introduce genetic diversity into a population?
A)mutations
B)very large populations
C)sexual reproduction
D)migration
7
Which of the following is a form of genetic drift in which a genetically distinct local population is established by a few colonizing individuals carrying with them alleles that differ in frequencies from those in their original population?
A)mutations
B)genetic bottleneck
C)founder effect
D)migration





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