genetic diversity and adaptation

Question 1

what is genetic diversity

Answer 1

the number of different alleles of genes in a population

Question 2

what has to be present for natural selection to occur

Answer 2

genetic diversity

Question 3

what is natural selection

Answer 3

selection pressures produce a gradual change in allele frequencies over several generations

Question 4

what does natural selection lead to

Answer 4

evolution

Question 5

what is evolution

Answer 5

change in allele frequency over many generations

Question 6

what are the 3 adaptations

Answer 6

anatomical, physiological and behavioural

Question 7

what are the steps of natural selection

Answer 7

new alleles for a gene are created by random mutations. if allele increases, chances of organism to survive and reproduce increase, advantageous allele is passed on to offspring. allele frequency increases over many generations

Question 8

what are the two types of selection

Answer 8

directional and stabilising

Question 9

what is directional selection

Answer 9

produces a gradual change in allele frequencies over many generations, usually an extremist trait and usually happens when there is a change in environment

Question 10

what is stabilising selection

Answer 10

allele frequencies are relatively constant, things stay the same unless there is a change in environment

Question 11

what is an example of directional selection

Answer 11

antibiotic resistance

Question 12

what is an example of stabilising selection

Answer 12

maintaining intermediate birth weights