Module 3-Lecture 19 Flashcards
What does stochastic mean?
Random
What is genetic drift?
Stochastic/random change in allele frequencies due to survival and reproductive success among individuals
Does the population size K change in average?
No it does not change on average
What is the expected number of offspring for each individual?
1
On average if births do not outplace deaths the population will eventually…
Go extinct
Is diversity lost all at once, or over time
Diversity is gradually lost over time
What does fixation mean?
When only one allele is left in the population
Who is the ancestor of all individuals in the future
A single individual at the current generation
What does the probability p mean
The probability that an individual will be the ancestor of all individuals
p = 1/N
If there is no migration, no mutation, no recombination, and no natural selection, and assume no extinction what will happen to the population?
One allele will eventually become fixed in the population
What is the equation for alleles probability of fixation?
K/N or 1/N x K
True or false: K/N tells the alleles current frequency
True
What is the probability that an allele present in the population will go to fixation?
p = 1/N
What is the probability that an allele will go extinct?
q = 1-p
True or false: the expected allele frequency changes over time
False
The expected allele frequency does not change over time
What does x(t) mean?
The allele frequency at generation t
True or false: x(t) = p
True
p is the same for every generation, the expected allele frequency does not change over time
