[10.5] quantitative investigations of variation

Question 1

what is intra-species variation?

Answer 1

variation within species

Question 2

what causes intra-specific variation?

Answer 2

different alleles (different versions of the same gene)

Question 3

what is inter-species variation?

Answer 3

variation between species

Question 4

what causes inter-species variation?

Answer 4

different genes

Question 5

what does successful sampling involve?

Answer 5

• selecting a group of organisms to study which are representative of the population
• randomly sampling to avoid sample bias
  > eg. choosing sites that are interesting, easy to get to, show greater variation

Question 6

how could you select a random sample within a field?

Answer 6

• create an x and y axis
• use a computer to generate random numbers
• sample at those co-ordinates

the larger the sample, the more reliable the data will be

Question 7

what is a belt transect?

Answer 7

placing and surveying a quadrat next to the line at regular intervalas

Question 8

what is is a line transect?

Answer 8

making a note of what species is touching the tape at regular intervals