3. darwins finches, peppered moths, extinction & conservation.

Question 1

darwins finches and adaptive radiation

Answer 1

Adaptive radiation is the evolution of different species from a common ancestor.
Ecological niche which is the ideal environment fir a particular species.

Darwin noticed the finches differed greatly in beak size & shape, each one adopted to eat a different food source.

Question 2

extinction

Answer 2

when an environment changes either too quickly or too much for a species to adapt by natural selection then the species could be extinct.

Question 3

conservation examples

Answer 3

• zoo that is involved in breeding programmes.
• wildlife reserves protect species.
• cell banks, store rare, threatened species, stored in an dormant stage.
• seed banks store seeds from plants, quite often the original parent before hybrids.

Question 4

peppered moth and how they are a selective advantage.

Answer 4

two forms of moth - light & dark form
in the industrial revolution the dark (melanic) form was prevalent.
in non industrial environments the light (peppered) form was more prevalent.
In each case the form was better camouflaged against the background and not seen by predators.
Whatever moth has the selective advantage survives and passes on its genes.