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#21 Classification of Species

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1 #21 Classification of Species

2 Warm-up Complete the worksheet

3 Recap… So far we’ve learned how natural selection explains change over time. Species are required to adapt, compete, vary, and overproduce in order to develop new traits that they deem most desirable. New species develop from ancestral species which displays the similarities and slight changes over the course of time.

4 *Biotic The living factors that affect an environment or ecosystem. *Abiotic The non-living factors that affect an environment or ecosystem.

5 Biotic or Abiotic? Biotic!

6 Biotic or Abiotic? Abiotic!

7 Biotic or Abiotic? Abiotic!

8 Biotic or Abiotic? Biotic!

9 Biotic or Abiotic? Abiotic! Unless you said the hand…

10 What are all the biotic and abiotic things in this picture?

11 Classification Brain Pop

12 *Classifying Organisms
As the worlds knowledge of different kinds of organisms expanded, so did our need to organize and group organisms together. Classification is the process of arranging organisms into groups based on similarities.

13 Discussion point If you had to classify life at Bailey, how would you do it? Can we divide Bailey into 2 large groups Can we divide those groups into subgroups? Can we make more subgroups?

14 Example ADULTS KIDS 6th GRADERS TEACHERS 7TH GRADERS ELA 8TH GRADERS
HORNETS PANTHERS TEACHERS ELA MATH SS SCIENCE ADMINISTRATORS PARENTS

15 *Taxonomy is responsible for grouping and naming organisms.
When scientists discover a new organism, they study it to determine where it fits in the classification system based off its relationships to living organisms.

16 TAXONOMY organizes LIFE down to the species!
KINGDOMS (the 5 kingdoms of life) PHYLUM (each kingdom broken down into dozens of phyla) CLASS (each phyla broken down further) ORDER (each class broken down into smaller “orders”) FAMILY (even more specific) GENUS (only the most closely related species here) SPECIES (only one SPECIFIC TYPE here!)

17 Something to think about
What are the benefits of taxonomy Why a worldwide universal system? Is taxonomy fixed and/or ever- changing? Explain

18 *Scientists use different evidence to classify organisms
Fossil evidence – showing how species evolved Physical evidence – traits that tells a species apart Genetic evidence – DNA that supports physical evidence A phylogenetic tree is a family tree that shows a hypothesis about the evolutionary relationships thought to exist among groups of organisms.

19 What animal is the chimp closely related to?
What animal is the chimp least related to?

20 What is the closest relative of lizard and snakes?

21 Look at this evolutionary tree. Can you answer some questions about it?

22 Does this evolutionary tree support that our dogs are direct descendants of gray wolves?

23 yes!

24 According to this evolutionary tree, are our dogs more related to foxes or coyotes?

25 COYOTES!

26 According to this evolutionary tree, what is our dog’s most distant relative shown here?

27 The BLACK BEAR!

28 *Is their an easier way to classify organisms?
A dichotomous key is a device for easily and quickly identifying an unknown organism. The user is presented with a sequence of choices between two statements (usually yes or no) based on characteristics of the organism. By always making the correct choice, the name of the organism will be revealed.

29                                                             

30 How ecosystems are structured
*Species - a group of organisms which can interbreed and produce fertile offspring

31 How ecosystems are structured
*Population - a group of organisms of the same species who live in the same area at the same time

32 How ecosystems are structured
*Community - a group of populations living and interacting with each other in an area

33 How ecosystems are structured
*Ecosystem - a system made up of organisms as well as the abiotic factors in the area.

34 Evolution lab evolution-lab/educator-guide/

35 Warmup Classification is vital when grouping organisms and is commonly used throughout our daily lifes. Classify the content in your bookbag starting with the most vague and getting more descriptive within each groups. heels flats sperrys toms running bball boots dress everyday sports casual Shoes

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