ASU BIO 340 TEST BANK QUESTIONS WITH
VERIFIED ANSWERS FULL REVIEW
●● Hypomorphic mutations
Answer: those that have lost only some of their function.
●● Null mutations
Answer: have lost all of their function.
●● haploinsufficient
Answer: a single copy is sufficient to produce the wild-type phenotype
in the heterozygous genotype
●● codominance
Answer: both alleles for the same characteristic are simultaneously
expressed in the heterozygote.
●● Incomplete Dominance
Answer: heterozygote phenotype appears to be intermediate between the
two parents
●● Multiple Alleles
,Answer: An example of ____ ABO blood-type system in humans. In this
case, there are three alleles circulating in the population.
●● allelic series
Answer: dominance hierarchy of multiple alleles
●● Complementary Gene Interaction
Answer: 9:7 Ratio /indicates two genes interacting in the same pathway.
Mutations in either gene disrupt the pathway, causing the mutant
phenotype.
●● Duplicate Gene Interaction
Answer: 15:1 Ratio /genes in a redundant system; they encode the same
product, or they encode products that have the same effect in a pathway
or compensatory pathways.
●● Dominant Gene Interaction
Answer: 9:6:1 Ratio /two genes govern any character separately but
when both are present together, their phenotypic effect is increased as if
the effects of the two genes were additive or cumulative.
●● Recessive Epistasis
Answer: 9:3:4 Ratio /occurs when recessive alleles at one gene mask or
reduce the expression of alleles at the interacting locus.
, ●● Dominant Epistasis
Answer: 12:3:1 Ratio /a dominant allele of one gene masks or reduces
the expression of either allele of the other gene.
●● Dominant Suppression
Answer: 13:3 Ratio /occurs when the dominant allele of one gene
suppresses the expression of a dominant allele of a second gene.
●● recessive lethal
Answer: An inheritance pattern in which an allele is only deadly in the
homozygous form and in which the heterozygote may be normal
●● dominant lethal
Answer: this allele can only be transmitted if the phenotype occurs after
reproductive age.
●● pleiotropic
Answer: Genes that control multiple, seeminlgy unrelated feaures
●● Chromosomal Theory of Inheritance
Answer: Homologous chromosome pairs migrate as discrete structures
that are independent of other chromosome pairs. Sorting of
chromosomes appears to be random. Male and female gametes have the
VERIFIED ANSWERS FULL REVIEW
●● Hypomorphic mutations
Answer: those that have lost only some of their function.
●● Null mutations
Answer: have lost all of their function.
●● haploinsufficient
Answer: a single copy is sufficient to produce the wild-type phenotype
in the heterozygous genotype
●● codominance
Answer: both alleles for the same characteristic are simultaneously
expressed in the heterozygote.
●● Incomplete Dominance
Answer: heterozygote phenotype appears to be intermediate between the
two parents
●● Multiple Alleles
,Answer: An example of ____ ABO blood-type system in humans. In this
case, there are three alleles circulating in the population.
●● allelic series
Answer: dominance hierarchy of multiple alleles
●● Complementary Gene Interaction
Answer: 9:7 Ratio /indicates two genes interacting in the same pathway.
Mutations in either gene disrupt the pathway, causing the mutant
phenotype.
●● Duplicate Gene Interaction
Answer: 15:1 Ratio /genes in a redundant system; they encode the same
product, or they encode products that have the same effect in a pathway
or compensatory pathways.
●● Dominant Gene Interaction
Answer: 9:6:1 Ratio /two genes govern any character separately but
when both are present together, their phenotypic effect is increased as if
the effects of the two genes were additive or cumulative.
●● Recessive Epistasis
Answer: 9:3:4 Ratio /occurs when recessive alleles at one gene mask or
reduce the expression of alleles at the interacting locus.
, ●● Dominant Epistasis
Answer: 12:3:1 Ratio /a dominant allele of one gene masks or reduces
the expression of either allele of the other gene.
●● Dominant Suppression
Answer: 13:3 Ratio /occurs when the dominant allele of one gene
suppresses the expression of a dominant allele of a second gene.
●● recessive lethal
Answer: An inheritance pattern in which an allele is only deadly in the
homozygous form and in which the heterozygote may be normal
●● dominant lethal
Answer: this allele can only be transmitted if the phenotype occurs after
reproductive age.
●● pleiotropic
Answer: Genes that control multiple, seeminlgy unrelated feaures
●● Chromosomal Theory of Inheritance
Answer: Homologous chromosome pairs migrate as discrete structures
that are independent of other chromosome pairs. Sorting of
chromosomes appears to be random. Male and female gametes have the
