4.6 Classification of living organisms Flashcards Preview

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Flashcards in 4.6 Classification of living organisms Deck (20)
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1

Organising living organisms into groups is called

classification

2

Who proposed the first classification system that grouped living organisms based on their characteristics and structures?

Carl Linnaeus

3

In the Linnaean system living organisms were first divided into ..

Kingdoms

4

Kingdoms are further subdivided into smaller and smaller groups - name these in the correct order

phylum
class
order
family
genus
species

5

In 1990 who proposed a three domain system?

Car Woese

6

In the Linnaean system, Linnaeus came up with the binomial naming system - what does this mean?

The name has two parts - genus and species

7

The binomial system is used worldwide - why?

avoid confusion - so all scientists in different countries speaking different languages use the same name

8

What do evolutionary trees show?

evolutionary relationships

9

If 2 species share a common ancestor, what does this mean?

They are closely related

10

Define kingdom

The largest group of classifying organisms

11

Define species in terms of classification

the smallest group for classifying organisms -they are very similar and can breed to produce fertile offspring

12

define genus

second smallest group for classifying organisms

13

What did Carl Woese do to refine the classification system further?

Pioneered the use of DNA and RNA technology in classification

14

What are the 3 domains in Carl Woese's refined classification system?

1. Eukaryote (plants, animals, protists and fungi), 2. Bacteria and 3. Archaea (primitive bacteria usually found in extreme environments)

15

Where does the domain group sit in the classification system proposed by Linnaeus?

Above the kingdom

Domain
kingdom
phylum
class
order
family
genus
species

16

In an evolutionary tree, where are the oldest species found?

At the bottom of the tree

17

Where are the most recently evolved species found on an evolutionary tree?

At the top of the tree

18

If an organism has gone extinct where is it not found on the evolutionary tree?

At the top!

19

To draw evolutionary tree scientists have to gather classification data on organisms from what sources?

DNA/RNA/structures/characteristics as well as fossil records

20

The Eukaryote domain includes which living organisms?

animals, plants, fungi and protists