Science 9 3.3 Evolution and Natural Selection.pdf

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1. Lesson 3.3

Evolution and
Natural Selection

2. Objectives
know and understand evolution;1
4
know and understand natural
selection;
understand the relationship of
evolution and natural selection; and
know the importance of evolution
and natural selection in biodiversity.
At the end
of the
lesson, you
should be
able to:
2
3

3. Learn about it!
Charles Darwin and the
Theory of Evolution
•Worked with Alfred Russel
Wallace

•Sailed aboard the HMS Beagle

•Greatly contributed to the
theory of evolution

4. Learn about it!
Common Ancestry
Organisms share a common ancestor
Gradualism
Changes happen gradually

5. Learn about it!
Adaptation
•Adaptation is when an
organism possesses traits
that can help it survive in
a certain environment

•Ex: Several adaptations
that bees have allow them
to pollinate flowers while
gathering food.

6. Learn about it!
Natural Selection
•Triggers the gradual
changes in the traits of
organisms from
generation to generation
until new characters or
traits are lost or created.

7. For the changes brought about by natural selection to
persist, there needs to be a genetic basis for these traits.

8. Learn about it!
Adaptive Radiation
•Adaptive radiation is
when an ancestral
species gives rise to
numerous other
forms.

9. Learn about it!
Divergent Convergent Parallel

10. Biological change is the progressive development in physical
and functional aspects of an organism during its entire life span.

Evolutionary change is the change in heritable traits of an
organism through successive generations.

11. Key Points
Adaptations help an organism survive.
Natural Selection depends on adaptations
Charles Darwin is the father of evolution.
Theory of Evolution explains how organisms
diversified.
1
2
3
4

12. Check Your Understanding
1.He was an English biologist who is well known for
introducing the concept of evolution.
2.He helped in further explaining evolution through natural
selection.
3.It is the principal reason for the evolution of organisms.
4.Natural selection is also known as _______________.
5.Darwin observed the beaks of finches in _______________.
Identify the following.

13. Challenge Yourself
Compare and contrast (consider three parameters)
biological and evolutionary changes.

14. Photo Credits
Slide 5: This file, Shioshvili_-_Bumblebee_and_Beans_(by-sa) by Vladimir Shioshvilli is licensed under CC
BY-SA 2.0 via Wikimedia Commons.

15. Bibliography
Buot Jr., Inocencio E., and Elaine Loreen C. Villanueva. "Threatened Plant Species of Mindoro,
Philippines." IAMURE International Journal of Ecology and Conservation 14.1 (2015). Web. 07
December 2015.

Carpenter, K.E. and Springer, V.G. 2005. The Center of the Center of Marine Shore Fish Biodiversity: The
Philippine Islands. Environmental Biology of Fishes, 72(4): 467-480.

Johnson, G.B., and Raven, P.H. 2001. Biology: Principles & Explorations. Austin: Holt, Rinehart and
Winston.

Mader, S.S. 2014. Concepts of Biology. New York: McGraw-Hill Education.

Myers, N., Mittermeier, R.A., Mittermeier, C.G., da Fonseca, G.A.B., and Kent, J. 2000. Biodiversity
Hotspots for Conservation Priorities. Nature, 403: 853-858.

16. Bibliography
Reece, J.B. and Campbell, N.A. 2011. Biology. Boston: Benjamin Cummings / Pearson.

“Biodiversity.” Foundation for the Philippine Environment - Researches - Biodiversity - Why Are We Losing
Species?, Accessed April 22, 2018. fpe.ph/biodiversity.html/view/why-are-we-losing-species.

Dasgupta, Shreya. “Earth - Ten Shocking Animal Diseases That May Threaten Species.” BBC, BBC, 27 Mar.
2015, Accessed April 23, 2018.
www.bbc.com/earth/story/20150327-ten-scary-diseases-of-animals.

Doherty, Tim, et al. “Invasive Predators Are Eating the World's Animals to Extinction – and the Worst Is
Close to Home.” The Conversation, Accessed April 23, 2018.
theconversation.com/invasive-predators-are-eating-the-worlds-animals-to-extinction-and-the-w
orst-is-close-to-home-64741.

17. Bibliography
Evolution and Natural Selection, Accessed April 23, 2018.
globalchange.umich.edu/globalchange1/current/lectures/selection/selection.html.

“Evolution of the Human Brain.” Stories, The Public Engagement Team at the Wellcome Genome
Campus, 13 June 2016, Accessed April 23, 2018.
www.yourgenome.org/stories/evolution-of-the-human-brain.

Extinction - Causes, Accessed April 22, 2018. people.uwec.edu/jolhm/EH4/Extinction/CausesLink.html.

jepeurii, /. “10 Unique Endemic Species in the Philippines.” It's More Fun in the Philippines, 3 Feb. 2015,
Accessed April 22, 2018.
wesharewisdom.wordpress.com/2015/02/03/10-unique-endemic-species-in-the-philippines/.

“Marine Biodiversity Wiki.” Aggregation and Marine Biological Value - Marine Biodiversity Wiki, Accessed
April 22, 2018. www.marbef.org/wiki/Aggregation_and_marine_biological_value.