Evolution

Question 1

What does natural selection lead to

Answer 1

Evolution

Question 2

What evidence is there for the theory of evolution

Answer 2

Fossils DNA molecular evidence

Question 3

Fossils

Answer 3

Imprints or remains of dead animals and plants in rocks from a long time ago
Fossil records provides evidence of how species have changed over time and how species have evolved

Question 4

DNA bas sequence- evidence for evolution

Answer 4

Comparing them of common genes or other molecular evidence (RNA or amino acid sequence) examine how closely related different species are.
Enabled scientists to estimate the point in history when two species shared a common ancestor.
Cythochrome C - found in mitochondria
Large number of species have- often the protein or gene that is compared.

Question 5

What can adaptations be classified as

Answer 5

Anatomical internal or external physical features
psychological processes that take place within an organism
behavioural

Question 6

What is convergent evolution

Answer 6

When different species are exposed to similar selection pressures eg environmental
Then they will undergo natural selection for similar alleles and there fore become more genetically similar

Question 7

Interspecific variation

Answer 7

Difference between members of different species

Question 8

Intraspecific variation

Answer 8

Difference between members of the same species

Question 9

Environmental factors

Answer 9

Can also cause variation - greater impact on plants- cannot move therefore always exposed to environmental conditions

Question 10

Continuous variation

Answer 10

Traits that are controlled by many genes and the environment can have an impact on
Represented on a histogram

Question 11

Discontinuous variation

Answer 11

Traits that are controlled by a single gene and the environment has no impact
Represented by bar charts

Question 12

What does natural selection do

Answer 12

Results in species becoming better adapted to their environment

Question 13

Natural selection long answer

Answer 13

• random mutation occurs
• genetic variation
• mutation provide advantage to survive in their environment - selection pressure
• new allele provides reproductive selective advantage- more likely to reproduce - reproductive success
  -over generations = increase frequency of this allele
• change in the allele frequency