Class Website (There is online vocab practice there.) Link to my Populations Change Over Time Assignments
16-3: Formation of a Species
❒ Explain how a new species is formed and identified. ❒ Identify if 2 organisms are of the same species or not.
16-2: Changes in Populations
❒ Explain the importance of the bell curve to population genetics. Pg 299
❒ What is the Hardy-Weinberg genetic equilibrium? Pg 302
❒ List 5 conditions that can cause evolution to take place.
Ch16 Review (pg 314)
1-3, 10-12, 14, 16, 19, 21,
23, 25, Crit Th. #4
❒ Explain Lamarck’s theory of evolution and how it was flawed.
❒ Explain Darwin’s theory of evolution
❒ List some of the evidence that led Darwin to his idea of how species might change over time. 15-3 Evidence
❒ Explain the evidence of evolution.
❒ Describe the patterns of evolution.
Blank Copies of
Populations Change over
⬩ Genetic drift
⬩ Nonrandom mating
⬩ Natural selection o o o o o Ch 15 Review
(pg 295): 3-10, 12-15,
18-24, Crit Th #1-3
Define a Species (16-3)
A. Originally based on
1. Problem some look different but were able to
B. Biological Species Concept
1. A pop. of organisms that can successfully
2. Cannot interbreed w/ other groups
3. The offspring must be fertile
C. Now: Based a species is .
Changes in Populations
A. Population Genetics (16-1)
1. Evolution is a gradual change in the of a population.
2. Population: a group of individuals of the that routinely
3. : a graph that shows how a trait changes throughout a large sample.
a) What other traits can show this?
B. Hardy-Weinberg Genetic Equilibrium (16-2)
1. Populations tend to remain the same (
) unless acted upon by
2. These 5 outside influences can cause changes in the genetics of a population:
(1) Change in .
(2) 1 or 2 mutations does not affect the .
(3) Many are harmful –
(4) Some are beneficial – those will and pass on DNA to .
(1) Movement .
(3) Keeps _______________ in gene pool
c) Genetic Drift
(1) 1 characteristic may if there isn’t a large enough population to balance it out.
(2) This is not a problem in large populations.
d) Nonrandom mating
(1) Mating/reproduction does take place randomly.
(2) Based on
(3) So an individual may mate with a
e) Natural Selection
(1) Process by which organisms with reproduce at than those without such variations. (2) Those that survive to reproduce will pass on
(3) ***Most significant factor in disrupting equilibrium
(4) 4 Types of Natural Selection:
(a) : Individuals with the average form have the highest fitness
:Individuals that have an extreme form of the trait have greater fitness.
(c) : Individuals with either extreme variation of a trait will survive. The average does not survive.
(d) : Females look for a specific trait.
A. Social use of the word “theory”
the same as in science;
2. implies a
B. Scientific Theory
1. Thoroughly tested explanation based on vast collections of
2. There are relatively scientific theories
a) Examples of scientific theories:
C. Theories of Evolution (15-2)
1. Lamarck (1800)
a) Similar species descended from a
– related to fossil