inheritance 2 mark schemes

Question 1

lemurs are small. Suggest how speciation happened to produce two species of lemur

Question 2

Biologists compared the mitochondrial DNA of the different subspecies of giraffe. They used the results from comparing this DNA to conclude that six of the nine subspecies are separate species.
Suggest how they came to this conclusion.

Answer 2

-dna base sequence
-fdifferent per species

Question 3

Use your knowledge of photosynthesis and respiration to explain the data in the bar chart.

Answer 3

-photosynthesis only during day
-no co2 uptake at night
-ground level more respiration and in leaves more photosynthesis
-

Question 4

how does day and night affect photosynthesis and respiration

Answer 4

day
- sunlight to produce food
-high rate of photosynthesis

night
-only respires at night
-more co2 out of plant
-no photosynthesis as stomata closes

Question 5

The population of trees in the forest evolved adaptations to the mountain environment. Use your knowledge of selection to explain how

Answer 5

-varition in pioneer colonisers
-changed the environment so better adapted species rise
greater reproductive success
-allele frequencies change

Question 6

what are some biotic factors

Answer 6

producers
consumers
-saprobionts

Question 7

explain why biotic factor and which have a great affect on the composition of organisms in a community