Download File - Ms. M`s Biology Class

We will be doing an Active Expression
review before our quiz.
You should also have your HOMEWORK
on your desk.



Evolution Active Expression Review (10 minutes)
Natural Selection Quiz (10 minutes)
Evolution of Desert Snakes Group Activity
(Remainder)




Reminders:
DBA #5: 9/29
HP 9/26
Edmodo assignment due TOMORROW
What environmental factor (Assignment 2)
contributes to fish with different mouth shapes?
 Which of the following is not an example of an
adaptation?

a. Artic hares with white fur
b. Claws on a lion
c. Bright colors on a toxic frog
d. White fur on a forest dwelling squirrel
Principle 1 of natural selection (Assignment 2) states that all populations have
_____________ variation.
T/F A green lizard living in the desert can change to green in order to avoid
predators.
Why do peppered moths during the Industrial Revolution demonstrate natural
selection?
A.
White and black moths were able to interbreed and create a new, more
camouflaged species of moth.
B.
Pollution of birch trees pushed the moth population to the brink of
extinction.
C.
As the trees grew darker, darker moths were able to survive, reproduce, and
pass on their genes; thus, over time, the peppered moth population
consisted of primarily dark moths.
D.
Light colored moths were able to transform their color to darker in order to
avoid the mutant birds that were able to hunt them with super cool laser
vision.
Natural Selection and Adaptations Quiz:
To be completed on your Active
Expression.
YOU MAY BEGIN ON QUIZ
IMMEDIATELY.
You should also have your HOMEWORK
on your desk.

As a group, you will develop an argument and
evidence for the evolution of different types of
desert snakes.

Argumentation is a central key to scientific
writing.
First, develop a claim. A claim is a clearly stated
stance. Example:
 Second, collect evidence using the handouts to
support your claim.


Claim clearly stated

At least 4 pieces of
evidence to support
claim

Evidence is
quantitative.

Group expectations:
 Everyone in the group
contributes.
 If necessary, assign roles.
 Volume and movement
Complete problem 22 on your
ALA sheet. (You should also have
a class copy).
A-What is the question asking
you?
L-Where do you look to find your
answer?
A-What is your answer and WHY?
 Catalyst: ALA 3 (7 minutes)
 Evolution and Speciation (20 minutes)
 Speciation questions and Trashketball
(Remainder)
 Reminders:
 DBA #5: Sept. 29th
 HP: Sept. 26th
Accountants
Edmodo assignment due by MIDNIGHT tonight (I will
be here after school)
 No school for you tomorrow!
 Parent Teacher conferences


What determines which organisms survive
and which do not?
 Do species ever change?
 How do scientists believe all of the species
that exist today were formed?
 What evidence is there to support
evolution?


SPI 3210.5.3 Recognize the relationships among
environmental change, genetic variation, natural
selection, and the emergence of a new species.

SWBAT define species, speciation and identify
factors that result in speciation
SWBAT distinguish between convergent and
divergent evolution

Biology
Unit 3
Section 15.2

Review: What is evolution?
 Evolution is the gradual change in a
population of organisms over time
▪ The key is over a long period of time

What is one of the main ways evolution
occurs?
 One of the main ways evolution occurs is
through natural selection
 Who developed this concept?

Examples of natural selection:
 Peppered moths
 Antibiotic-resistant bacteria
 Green/brown lizards
We are going to
be talking about
Different theories.
They may conflict
with your beliefs
(and that’s okay).
Its something that
we need to cover
in order to
prepare you in
Biology.

Natural selection causes a population to
evolve, but it may or may not create a new
species
 Deer mice: dark brown  light brown mice
 Moths: Light moths  dark moths
▪ These examples of evolution did not create a
new species, however
REVIEW:
Key Term: A species is a group of organisms
that can mate and produce fertile offspring
 Fertile offspring means the offspring are also
able to reproduce


Homo sapiens: (scientific name for humans)
Male and female homo sapiens with any
variation can mate to produce children.
These children can grow up to reproduce with
other humans as well.



Any animals that cannot physically mate.
Any animal that can physically mate, but
cannot reproduce offspring.
Any animal that physically mate, and
reproduce INFERTILE or Sterile offspring.

A lion and tiger can mate and produce the
animal known as the Liger. A Liger is a sterile
animal that cannot have offspring. Since the
offspring of the lion and tiger does not
produce fertile offspring, they are considered
separate species.


From where do scientists suggest that all
organisms that exist today came?
Key Point 1: Many scientists believe that all
species that exist today evolved from a
common ancestor
 What is an ancestor?

Even humans?
 Even humans!
▪ From primates (chimpanzees)


If a population of organisms adapts to its
environment and can no longer reproduce
with other populations, a new species has
evolved.
Key Point 2: Speciation is the development
of a new species of organisms from an
existing species
 This typically occurs over a very long period of
time

Key Point 3: Speciation can be caused by:
 Geographic isolation—a population is
separated by a physical barrier
▪ May be separated by a mountain, canyon,
river, etc. or because of flooding or other
changes in habitat
▪ Organisms no longer mate and are forced to
develop different adaptations to survive
▪ Eventually they cannot reproduce together

Adaptive Radiation occurs
when diversify quickly into
different forms-particularly
after a change in the
environment makes new
resources or niches available.

Niche= the physical
environment (habitat) that
an organism occupies and
the adaptations that allow
for life in that habitat
Key Point 4: Reproductive isolation

Populations no longer mate or produce
fertile offspring due to different mating
seasons, different anatomies, or different
number of chromosomes in their gametes


Two populations of toads began mating
during different times of the year and no
longer reproduce. Over time, two different
species of toads have developed.
Is this a result of geographic or reproductive
isolation?


A flood forces one population of snakes to
move to another habitat. Over time, this
population evolves into a new species of
snake as it adapts to its environment.
Is this a result of geographic or reproductive
isolation?


Two different species of mountain goats have
appeared on opposite sides of the Rocky
Mountains.
Is this a result of geographic or reproductive
isolation?


Key Point 5: When one species evolves into
two or more different species, this is
known as divergent evolution
Example: Scientists believe that various
species of cats (cheetahs, leopards, jaguars,
etc.) evolved from a common ancestral
species many years ago


Key Point 6: When different species change
over time to develop similar adaptations due
to similar environments this is known as
convergent evolution
Example: Sharks and dolphins are different
species, but over time they have developed
similar adaptations to survive in their
environments



Each species of mammal below is believed to
have evolved from a common ancestral
species
Convergent or divergent evolution?
Why?

The thorny devil and Texas horned lizard are
two different species of lizards that have
adapted over time to eat similar foods and
behave in similar ways because of similar
environments


Convergent or divergent evolution?
Why?


These two tortoises above belong to different
species. Scientists believe they evolved from
a common ancestor but developed different
adaptations to survive in their environments.
Convergent or divergent evolution?
9.
What is the term used to describe the
development of a new species from an
existing species?
Speciation
10.
What term is used to describe a group of
organisms that can reproduce and produce
fertile offspring?
Species

http://www.bing.com/videos/search?q=huma
n+evolution&FORM=HDRSC3#view=detail&
mid=E384782EF298F6C60D8EE384782EF298
F6C60D8E



Speciation Trashketball
I will give you a certain amount of time to
answer each question. When it is your team’s
turn, I will randomly call on someone to
answer.
Get it right = take a shot