Download Founder Effect Exercise

Founder Effect Exercise
Founder Effect Exercise
Genetic Drift
 A change in the allelic frequencies in a
population that is due to chance
 In smaller populations, the effects of genetic
drift become more p
pronounced, and the
chance of losing an allele becomes greater.
Founder Effect
 Occurs when a small sample of a
population settles in a location separated
f
from
the
th restt off the
th population
l ti
 Alleles that were uncommon in the original
g
population might be common in the new
population.
Founder Effect Exercise
Founder Effect Exercise
25% Brown
25% Red
25% Red
25% Yellow
12.5% Yellow with Spots
12 5% Tan
12.5% Tan
Founder Effect Exercise
Founder Effect Exercise
Multiple Alleles
B B
B = Brown Color, Dominant over B
C l D i
t
BR, B
BY, B
BYS, B
BT
BR = Red Color, Dominant over BY, BYS, BT
BY = Yellow Color, Dominant over BYS, BT
BYS = Yellow with Spots, Dominant over BT
BT = Tan Color, Recessive to all.
Founder Effect Exercise
Founder Effect Exercise
Two of the beetles leave the colony and form a y
y
new colony several miles away. You and a partner will pick 2 beetles at random from the population to simulate the founder effect. By flipping two coins, you will create 16 y pp g
y
offspring from these 2 beetles. You will then calculate the phenotype frequencies and compare them to the original population.
h
h
l
l
Founder Effect Exercise
Founder Effect Exercise
Answer these questions in your notebook:
1 What are the genotypes and genotype 1.
What are the genotypes and genotype
frequencies for the 16 off‐spring?
2 What are the phenotypes and phenotypes 2.
Wh t
th h
t
d h
t
frequencies for the 16 off‐spring?
3. How does the genetic variability of the off‐
spring compare to the original colony?