BIOL 206 MIDTERM 2 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW
How do other microevolutionary forces affect quantitative traits?
What's the equation? Ans✓✓✓In theory, genetic drift, migration, non
random mating and mutation on Va should be the sum of their effects on
individual loci.
Va= Sum( 2pqa^2) - Sum(2pqa^2) / 2Ne
What does a response to sexual selection depend on? Ans✓✓✓1. mode
of selection
2. Genomic architecture of trait: (what are the effects of these loci? is
there and linkage?)
3. Genetic correlations between traits
What is the breeders equation? Ans✓✓✓R= difference in the trait mean
between 2 generations (o and p)
h^2= narrow-sense heritability
S= difference in mean between al the parental generations and selected
parents
How do quantitative traits respond to selection? Ans✓✓✓the rate at
which the mean fitness of a population increases is proportional to the
additive genetic variation
Va= sum( 2pqa^2)
a= additive effect
, What is narrow sense heritability? Ans✓✓✓the proportion of
phenotypic variation due to additive genetic variation
How can we determine the genetic basis of quantitative traits? (3)
Ans✓✓✓- Quantitative trait mapping
- candidate genes; genes whose functions are known in other organisms
- heritability HB= VG/VP
VG= VA+VD+VI
Why is quantitative genetics important? (7) Ans✓✓✓- quantitative traits
may be continuous merisitc or threshold
- includes traits important to: evolutions, agriculture, hunting/fishing,
medicine, conservation
What is quantitative genetics? Ans✓✓✓study of the evolutionary
properties of traits under polygenic inheritence
What reduces linkage disequilibrium? Ans✓✓✓linkage declines with
time according to the recombination rate (r)
Why is disequilibrium important? (4) Ans✓✓✓- associative over
dominance
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW
How do other microevolutionary forces affect quantitative traits?
What's the equation? Ans✓✓✓In theory, genetic drift, migration, non
random mating and mutation on Va should be the sum of their effects on
individual loci.
Va= Sum( 2pqa^2) - Sum(2pqa^2) / 2Ne
What does a response to sexual selection depend on? Ans✓✓✓1. mode
of selection
2. Genomic architecture of trait: (what are the effects of these loci? is
there and linkage?)
3. Genetic correlations between traits
What is the breeders equation? Ans✓✓✓R= difference in the trait mean
between 2 generations (o and p)
h^2= narrow-sense heritability
S= difference in mean between al the parental generations and selected
parents
How do quantitative traits respond to selection? Ans✓✓✓the rate at
which the mean fitness of a population increases is proportional to the
additive genetic variation
Va= sum( 2pqa^2)
a= additive effect
, What is narrow sense heritability? Ans✓✓✓the proportion of
phenotypic variation due to additive genetic variation
How can we determine the genetic basis of quantitative traits? (3)
Ans✓✓✓- Quantitative trait mapping
- candidate genes; genes whose functions are known in other organisms
- heritability HB= VG/VP
VG= VA+VD+VI
Why is quantitative genetics important? (7) Ans✓✓✓- quantitative traits
may be continuous merisitc or threshold
- includes traits important to: evolutions, agriculture, hunting/fishing,
medicine, conservation
What is quantitative genetics? Ans✓✓✓study of the evolutionary
properties of traits under polygenic inheritence
What reduces linkage disequilibrium? Ans✓✓✓linkage declines with
time according to the recombination rate (r)
Why is disequilibrium important? (4) Ans✓✓✓- associative over
dominance
