Transcript DISRUPTING GENETIC EQUILIBRIUM

Warm-up 2/21:
• Measure the length of your hand in cm.
• Place ruler up on desk & Stand your hand
up.
• Measure from bottom of palm to tip of
tallest finger.
• Use your phone or a friends phone and enter
your results at http://goo.gl/8y4qVA
or link on Mr. E’s page
• Turn in flipbook.
• Study for quiz.
Warm-up 2/26:
• What are the 5 conditions for Hardy-Weinberg
genetic equilibrium?
• Define and give an example for:
• Superposition
• Phylogeny
• Allele Frequency
• Gene Pool
• Study for Quiz
DISRUPTING GENETIC
EQUILIBRIUM
Ch. 16-2 pp. 321-325
Warm-up 2/29:
• What are the 5 conditions for Hardy-Weinberg
genetic equilibrium?
• What is genetic equilibrium? Explain the
equilibrium.
• What 5 conditions would disturb this genetic
equilibrium?
DISRUPTING GENETIC
EQUILIBRIUM
Ch. 16-2 pp. 321-325
Definitions..
Evolution is the change in a population’s
genetic material (alleles) over
generations.
 A population is in genetic equilibrium if
it’s not evolving

Natural Selection (3 Types)
Rules
•
•
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Organisms best suited to their environment
live to reproduce and pass on their genes
Acts on a phenotype
Varying types of selection
WHAT PUSHES A POPULATION OUT OF
EQUILIBRIUM?
Population is in
equilibrium
5 Factors
I. Mutation

Produces and introduces new alleles in a population
II. Migration/ Gene Flow

Movement of individuals in or out of a population
 Immigration
– In (Entering population)
 Emigration – Out (Leaving population)
III. Genetic Drift



The amount of an allele changes due to random events
Affects small populations mostly
Lose alleles if not enough to mate or a catastrophe occurs
III. Genetic Drift
•


The amount of an allele changes due to random events
EX: extreme weather, disease, habitat destruction, etc
Affects small populations mostly!
Case Study: Population of the nearly
extinct northern Elephant Seal have lost
genetic variability—individuals are
homozygous for all their genes tested.
This result of genetic drift makes the
species vulnerable to extinction.
IV. Non-random mating


Can amplify certain traits and reduce others through
sexual selection
Sexual Selection - Choose mates based on specific
traits and those traits increase in the population
V. Natural Selection (3 Types)



Organisms best suited to their environment live to
reproduce and pass on their genes
Acts on a phenotype
Varying types of selection
V. NON-RANDOM MATING

a. Artificial Selection- Humans choose desirable
traits in animals to cause changes.
Warm-up 2/29:
• What are the 5 conditions for Hardy-Weinberg
genetic equilibrium?
• What is genetic equilibrium? Explain the
equilibrium.
• What 5 conditions would disturb this genetic
equilibrium?
DISRUPTING GENETIC
EQUILIBRIUM (CONT)
Ch. 16-2 pp. 321-325
Directional Selection
Individuals with a more extreme form of trait have
higher fitness
Normal Distribution
Distribution after Selection

https://www.youtube.com/watch?v=iTmHtxJpEWE
Stabilizing Selection
Having average form of trait has highest fitness
Normal Distribution
Distribution after Selection
Disruptive Selection
Individuals with any extreme trait has a higher fitness
and most likely results in two new species
Normal Distribution
Distribution after Selection
Homework

Evidence For Evolution Packet
Analogous Structures p6 & Embryology p. 7-12 Due Monday
(2/29)
 Biogeography section and Map Due Tuesday (3/1)


Finish Evidence For Evolution Flipbook




Pages # 6-7 Due Tuesday (3/1)
Lab: Variation in a Population p11-13: Due Tuesday
Worksheet #3: Disrupting Equilibrium: Due
Wednesday (3/2)
Evo 2 Study Guide: Due Thursday March 10
HW:
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Due Mon: Read 317-320 Do p320 #1-5 Due Mon
Due Tuesday: Vocab & Read p 321-325 Do
problem p 325 #2-5
Vocab (Tri-fold) for:
Vocab
Gene Flow
Phylogeny/ phylogenic tree
Genetic Drift
Adaptive Radiation
Stabilizing Selection
Allele frequency
Disruptive Selection
Gene pool
Hardy-Weinberg genetic
equilibrium
Directional Selection
Superposition
Warm-up 2/21:
Describe what happened with the gene pool
with the mice from yesterdays video.
(Min. 3 sentences & use as much Vocab as
you can.)
What are the five assumptions that must
hold true to achieve genetic equilibrium?
DISRUPTING GENETIC
EQUILIBRIUM
Ch. 16-2 pp. 321-325