3.4.7 investigating diversity Flashcards
1
Q
how can genetic diversity be measured within a species ?
A
- frequency of measurable or observable characteristics
- base sequence of DNA
- base sequence of mRNA
- amino acid sequence of the proteins encoded for by DNA and mRNA
2
Q
what are the advantages of using a quadrat?
A
- manageable
- portable
- useful to make species comparisons in different areas of habitat
3
Q
what are the disadvantages of using a quadrat?
A
- difficult to use with tall vegetation or on rough ground
- not as useful to record animals able to move
4
Q
how would you sample randomly?
A
- lay out 2 tape measures at right angles along 2 sides of the study area
- obtain a series of coordinates using a random number generator
- place a quadrat at intersection of coordinates and record species within it
5
Q
what is percentage frequency?
A
the likelihood of a particular species occurring in a quadrat
6
Q
what is percentage cover?
A
an estimate of the area within a quadrat that a species covers
7
Q
what are the different types of quadrat?
A
- open frame
- frame quadrat divided into 25 smaller squares
- frame quadrat divided into 100 smaller squares
- point quadrat
8
Q
what is an advantage of using an open frame quadrat?
A
- you can place it over large organisms
9
Q
what is a disadvantage of using an open frame quadrat?
A
- no good for layered individuals
- not precise as no small intervals
10
Q
what is an advantage of using a frame quadrat divided into 25 small squares?
A
- portable
11
Q
what is a disadvantage of using a frame quadrat divided into 25 small squares?
A
- need a counting technique
- not suitable for tall individuals
