From an initial** q = 0.50** in each of **10 **populations
with **N = 20** [top] or **100 **[bottom]
individuals, **q**** = f(a)** diverges at random over
time from the starting value. The divergence in more rapid
among smaller populations than larger. With **N = 20**,
eight populations have gone to either **loss **(**q =
0.0**) (n = 4) or **fixation **(**q = 1.0**) (n =
4) after 100 generations, whereas with **N = 100** after
100 generations, all of the populations save one retain both
alleles, in the range of **q **= 0.01 ~ 0.90.

Allele frequencies continue to vary at random so long as**0 < q < 1**: **q = 0.0** or
**1.0** are **absorbing barriers**, which once reached
end further change. Fate of **q** in a population is not
especially predictable: between **g = 70** & **100 **with
**N = 100**, dark orange **q**
goes from **0.70** to **0.15**, and light green **q** from **0.10** to **0.80**

**HOMEWORK**: Repeat the
simulations with the **MatLab **program **WriFish****.m**
with **N = 100 **or **1,000 **or **10,000**
individuals in **10 **populations @, over **1,000 **generations.
Compare the visual variance, as above. Note any loss or
fixation events.

Allele frequencies continue to vary at random so long as

Figures & Text
material © 2021 by Steven M. Carr