Unit 3 evolution of species

Question 1

Mutation

Answer 1

Random change to genetic material

Can result in plants and animals becoming better adapted

Question 2

Types of mutations

Answer 2

Neutral
Advantage
Distadvantage
To survival

Question 3

Why are mutations spontaneous

Answer 3

Only source of new alles

Question 4

What can increase the rate of mutations

Answer 4

Radiation

Chemicals

Question 5

Vartiation

Answer 5

Makes it possible for a population to evolve over time in response to chaninging environmental changes

Question 6

Adaption

Answer 6

An inherited characteristic that makes an oragnism well suited to survival on its environment/niche

Question 7

When does natural selection occur

Answer 7

When there are selection pressures

Question 8

Natural selection

Answer 8

The best adapted induviduals in a population survive to reproduce, passing on the favourable alleles increase the frequency within a population

Question 9

When does speciation occur

Answer 9

After part a population becomes isolated by an isolation barrier

Question 10

Types of isolation barriers

Answer 10

Geographical
Ecological
Behavioural

Question 11

Stages of specisation

Answer 11

Different mutations occur in each sub-population

Natural selections selects for different in each group, due to different selection pressures

Each sub-population evolves until they become so genetically modified that they are 2 different species