BIOL 3301 EXAM QUESTIONS AND ANSWERS
LATEST UPDATE (GRADED A+)
9:3:3:1 phenotypic ratio
Expected F2 ratio of dihybrid cross
No gene interaction/absence of epistasis
9:7 ratio
complementary gene action
15:1 ratio
in an examination of progeny from dihybrid crosses, this could indicate a gene duplication event
9:6:1 ratio
dominant gene interaction
A 9:3:4 ratio in the F2 indicates a type of gene interaction known as
recessive epistasis
12:3:1 ratio
dominant epistasis
13:3 ratio
Dominant Supression
1:1:1:1 ratio would be expected for
unlinked genes
result of heterozygous & homozygous recessive parent
Haplosufficient
For a particular gene, one functioning copy is enough for a wildtype phenotype.
haploinsufficient
For a particular gene, one functioning copy is not enough for a wildtype phenotype.
loss of function mutation
Causes the complete or partial absence of normal function.
Mutant alleles are usually RECESSIVE
often lethal in HOMOZYGOUS state.
gain of function mutation
LATEST UPDATE (GRADED A+)
9:3:3:1 phenotypic ratio
Expected F2 ratio of dihybrid cross
No gene interaction/absence of epistasis
9:7 ratio
complementary gene action
15:1 ratio
in an examination of progeny from dihybrid crosses, this could indicate a gene duplication event
9:6:1 ratio
dominant gene interaction
A 9:3:4 ratio in the F2 indicates a type of gene interaction known as
recessive epistasis
12:3:1 ratio
dominant epistasis
13:3 ratio
Dominant Supression
1:1:1:1 ratio would be expected for
unlinked genes
result of heterozygous & homozygous recessive parent
Haplosufficient
For a particular gene, one functioning copy is enough for a wildtype phenotype.
haploinsufficient
For a particular gene, one functioning copy is not enough for a wildtype phenotype.
loss of function mutation
Causes the complete or partial absence of normal function.
Mutant alleles are usually RECESSIVE
often lethal in HOMOZYGOUS state.
gain of function mutation
