B7 Variation/Evolution

Question 1

Definition

Variation

Answer 1

The physical differences within a species.
There is genetic variation which is determined purely by genes for example skin colour.
There is enviromental variation which is dependent on your enivroment for example tatoos.

Question 2

Who discovered the theory of natural selection and explain how it works

Answer 2

Charles Darwin

Organisms with the most suitable characteristics for the enviroment would be more succesful competitors and more likely to survive.
If more survive they are more likely to reproduce and so are more likely to pass on their genes to the next generation.

Question 3

3 reasons for exctinction

Answer 3

New Predator
New disease
Catastrophic event for example volcanoes

Question 4

2 reasons why Darwin’s theory wasnt agreed with

Answer 4

It went against common religous beleifs
There wasnt enough evidence to convice scientists

Question 5

Explain Lamarck’s theory and an example

Answer 5

Lamarck argued that changes ocurring in an organism’s life would be passed onto heir organism
if a rabbit runs a lot the child would be stronger in their legs and have longer legs

Question 6

Order of classification and who discovered it

Answer 6

Carl Linnaeus
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species

Question 7

What are the 3 domains
Explain each

Answer 7

Archea- Primitive bacteria they are extremophiles. Prokaryotic

Bacteria-These are true bacteria like E coli. Lots of biochemical differences with Archea.

Eukaryota- Eukaryotic cells including protists fungi animals and plants

Question 8

How is an organism named using the system

Answer 8

Genus-Homo
Species- Sapiens

Question 9

Definiton

Speciation and how does it occur

Answer 9

The devlopment of a new species.

Occurs when populations of the same species become so different that they can no longer succesfully interbreed to produce fertile offspring. Due to different enviroments

Question 10

How does isolation lead to speciation

Answer 10

Isolation is when populations are seperated. This can happen due to a physical barrier.
Then in different geographical locations different characterisitcs will become more common which deviates them from each other becoming new species.