B6 Evidence For Evolution Flashcards Preview

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Flashcards in B6 Evidence For Evolution Deck (22)
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1
Q

Complete the sentence

Scientists believe that all complex organisms on earth have evolved from ……………that existed 3500 million years ago.

A

Simple organisms

2
Q

What provide evidence for evolution?

A

Fossils records and antibiotic resistance in bacteria.

3
Q

What is a fossil?

A

Any trace of an animal or plant that lived long ago.

4
Q

Where are fossils most commonly found?

A

In rocks

5
Q

What can fossils tell us about ?

A

What organisms looked like and how long ago they existed.

6
Q

What can be observed by arranging fossils in chronological order?

A

Gradual changes in organisms can be observed.

This provides evidence for evolution, because it shows how species have changed and developed over many years.

7
Q

See p87 for diagram of how horse has evolved

A

.

8
Q

What do random mutations in bacteria DNA cause?

A

New variants into the population

9
Q

What can random variants in the DNA of bacteria, introducing new variants into the population, lead to?

A

These can lead to changes in the bacteria’s phenotype.

For example a bacteria could become less affected by a particular antibiotic.

10
Q

Why is an advantage for bacterium to develop random mutations, that can lead to changes in their phenotype?

A

The bacterium is better able to survive, even in a host that is being treated with antibiotics.

So it lives for longer and reproduces many more times.

11
Q

How do scientist continue to test the theory of evolution by natural selection?

A

By making observations and collecting new evidence.

12
Q

What can the emergence of antibiotic-resistant bacteria be explained by?

A

The theory of evolution by natural selection ( as there is change in the inherited characteristics of a population over time)

13
Q

Why is it easy to observe the theory of evolution by natural selection in bacteria?

A

Because reproduce very quickly, so scientists can observe evolution as its occurring, so it provides great support for the theory.

14
Q

Why is the theory of evolution now widely accepted by the scientific community?

A

Because of strong evidence

15
Q

How do genetic variants for antibiotic resistance arise in a population of bacteria?(1 mark)

A

By mutations

16
Q

Describe how fossils provide evidence for evolution (2 marks)

A

Fossils can show what organisms that lived a long time ago looked like (1 mark)
Arranging them in chronological/date order shows how organisms gradually changed/developed.(1- mark)

17
Q

How do scientist continue to test the theory of evolution by natural selection?

A

By making observations and collecting new evidence.

18
Q

What can the emergence of antibiotic-resistant bacteria be explained by?

A

The theory of evolution by natural selection ( as there is change in the inherited characteristics of a population over time)

19
Q

Why is it easy to observe the theory of evolution by natural selection in bacteria?

A

Because reproduce very quickly, so scientists can observe evolution as its occurring, so it provides great support for the theory.

20
Q

Why is the theory of evolution now widely accepted by the scientific community?

A

Because of strong evidence

21
Q

How do genetic variants for antibiotic resistance arise in a population of bacteria?(1 mark)

A

By mutations

22
Q

Describe how fossils provide evidence for evolution (2 marks)

A

Fossils can show what organisms that lived a long time ago looked like (1 mark)
Arranging them in chronological/date order shows how organisms gradually changed/developed.(1- mark)

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