T1-4 Application

Question 1

How to improve presentation of data in a table

Answer 1

Have independant variable in first column

Keep all numbers to same number of decimal places

Question 2

Why is it better to carry out an experiment with water at 30 °C rather than 20 °C

Answer 2

Warmer water has more kinetic energy

More osmosis

Question 3

All mammals produce a lipase called CEL.
CEL digests triglycerides. Mammals feed their young on milk.
CEL digests the triglycerides in milk.
The ability to produce CEL occurred due to a gene mutation.

Describe how natural selection may have led to all mammals in a population producing CEL.

Answer 3

Mutation results in a new allele

Those with new allele able to digest triglycerides

Individuals with CEL more likely to survive and reproduce

Directional selection

Increase in frequency of allele in population