Describe how abnormal haemoglobin arises in the human population.

Explain the effects of the gene for abnormal haemoglobin in humans.

What is meant by polyploidy?

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water