Ka 7

Question 1

Give the definition of evolution

Answer 1

Evolution is the changes in organisms over generations as a result of genomic variations

Question 2

Describe what natural selection is

Answer 2

Natural selection is the non random increase in frequency of DNA sequences that increase survival and the non random reduction in the frequency of deleterious sequences

Question 3

Describe what happens during a stabilising selection

Answer 3

An average phenotype is selected for and extremes of the phenotype range are selected against

Question 4

Describe what happens during directional selection

Answer 4

One extreme of the phenotype range is selected for

Question 5

Describe what happens during disruptive selection

Answer 5

Two or more phenotypes are selected for

Question 6

Explain why natural selection is more rapid in prokaryotes

Answer 6

Their reproduction time is much shorter

Question 7

Explain the benefit of horizontal gene transfer

Answer 7

Results in faster evolutionary change than only using vertical gene transfer