2019 P2 Flashcards
Succession occurs in natural ecosystems. Explain how succession occurs
Colonisation by pioneer species Pioneer species change the environment Environment becomes less hostile for new species Increase in biodiversity To climax community
Full genotype of fly 6
GgXRXr
Give one piece of evidence that show s allele for grey body colour is dominant
If it was recessive all flies of 3 and 4 would be grey but 3+4 produce ((black)
Explain one piece of evidence that the gene for body colour is not on X chromosome
3 and 4 produce 9
Fly 3 would pass dominant allele to 9
Describe what happens during photoionisation in light dependent reaction
Chlorophyll absorbs light
Electrons are lost
Why student marked origin using pencil
Ink and leaf pigment would mix
Describe method student used to separate the pigments after the solution of pigments had been applied to the origin
Level of solvent below origin
Stop before solvent reached top
Advantage of having different coloured pigments in leaves
Absorb more wavelengths of light for photosynthesis
How you could estimate the size of a population of sundews in a small marsh
Divide area into squares and number them
Use random number generator to select squares
Count frequency in a quadrat
Large sample
Calculate mean
Mean no of plants per quadrat x no of quadrats = total
How digesting insects helps the Dundee to grow in soil with very low concentrations of some nutrients
Digestion of proteins = amino acids
Sunlight transferred into fences and urine of zebra
0.155%
Calculate energy stored in new tissues of zebra
178
64% grey bodies
Use handy Weinberg equation to calculate % of flies hetrozygeous for G
48%
What is neede for light dependent reaction
D
NADP, ADP, Pi and water
complete genetic diagram - grey-bodies, white eyed female x black-bodied, red eyed male
G= grey body g= black body XR = red eyes Xr= white eyes
offspring = GgXRXr, ggXRXr, GgXrY, ggXrY
1:1:1:1 ratio
grey, red female
black, red female
grey, white male
black, white male
