evolution of species

Question 1

mutations

Answer 1

random change in organisms genetic info
only source of new alleles, spontatious

Question 2

factors the increase mutation rate

Answer 2

chemical - mustard gas, cigarette smoke
radiation - uv rays, x rays

Question 3

advantageous mutations

Answer 3

increase ability of organism to survive and reproduce

Question 4

neutral mutations

Answer 4

neither beneficial or detrimental to survival or reproduction of organism

Question 5

disadvantageous mutations

Answer 5

disadvantage on the survival of organism

Question 6

steps of natural selection

Answer 6

1. species produce more offspring than environment can sustain
2. offspring may have variation
3. best adapted organisms survive to reproduce (natural selection)
4. pass on favourable alleles that give them selective advantage
5. alleles increase in frequency

Question 7

natural selection is known as

Answer 7

survival of the fittest
individuals best suited to environment more likely to survive

Question 8

natural selection occurs when there are

Answer 8

selection pressures