L18 QG Drift and Inbreeding

Question 1

Extinction vortex

Answer 1

Specific biological features: - demography - reproduction regime - ecology

Question 2

Loss of genetic diversity

Answer 2

• drift - inbreeding

Question 3

Selection vs Drift

Answer 3

selection is a powerful evolutionary force selection tends to overrule drift

Question 4

Lambda

Answer 4

growth rate = number of offspring left by each parent To prevent extinction, make sure that reproductive fitness is greater than 1 with respect to the growth rate

Question 5

Properties affecting drift

Answer 5

5 points

Question 6

Inbreeding

Answer 6

designates the mating between relative resulting in an inbred individual

in small populations the probability of one individual having received two alleles IBD is higher => increase in inbreeding

Question 7

The inbreeding coefficient (F)

Answer 7

probability that the two alleles at a locus in an individual are IBD

Question 8

At the individual level = Coefficient of inbreeding in general for a diploid

Answer 8

Steps to calculate in onenote

Question 9

The effect of inbreeding on traits

Answer 9

• leads to change in genotypic freq as there is no random mating - inbreeding only affects dominant component of genetic effect - inbreeding removes heterozygotes

Question 10

Inbreeding depression and genetic load

Answer 10

• overdominance and hybrid vigor - dominance and genetic load

Question 11

Drift

Question 12

Inbreeding

Question 13

The effect of population size and drift

Question 14

Expected effect of drift on allele freq

Question 15

At the population level = coefficient of inbreeding