Evidence for evolution

Question 1

John Endler’s study on Guppie colours

Answer 1

spots on males increased when predators weren’t present because they were attractive to females and males didn’t need camouflage
when predators were present, the number of spots decreased so they could camouflage

Question 2

How does embryology provide proof of evolution

Answer 2

all human embryos have tails and gill slits, this proves that we have evolved from animals that had tails and gill slits

Question 3

How does biochemistry provide evidence for evolution

Answer 3

closely related species have fewer differences in their DNA when we sequence it

Question 4

How does Darwin’s research provide evidence for evolution

Answer 4

Mockingbirds on the Galapagos islands seemed to be of different species on each island
suggesting that they had migrated from the continent and diversified

Question 5

what is unity of life

Answer 5

Organisms share many characteristics - this is because they have a common ancestor

Question 6

how does biogeography provide evidence

Answer 6

closley related species on different continents suggests they evolved together and separated due to the break up of the continents (e.g. large flightless birds on southern continents (ostrich, emu))

Question 7

limitations of using the fossil record

Answer 7

incomomplete and often only aquatic organisms and hard bodied organisms

Question 8

how homology is used as evidence for evolution

Answer 8

homology is similarity between structures in different species - it suggests common ancestry