1.4 - Variation

Question 1

What is environmental variation?

Answer 1

Differences between individuals due to the surroundings e.g hair length, piercings, accent

Question 2

What is continuous variation?

Answer 2

This means that there is a continuous range of something e.g heights, weight- Any values in a population

Question 3

What is discontinuous variation?

Answer 3

No range or inbetween- one or the other e.g hair colour, eye colour, shoe size

Question 4

What is mutation?

Answer 4

A randomly derived change to the base sequence of the genetic material of an organism

Question 5

What are mutations caused by?

Answer 5

• copying errors in cell division

- exposure to mutagens such as ultraviolet or ionising radiation

Question 6

What can happen to a protein during a mutation?

Answer 6

-protein might contain a different amino acid and be faulty

Question 7

What is cystic fibrosis?

Answer 7

A hereditary disease caused by a faulty gene which makes it harder to breathe and digest food

Question 8

What are the symptoms of cystic fibrosis?

Answer 8

• cough and wheeze
• recurring chest and lung infections
• malnutrition

Question 9

How does oxygen therapy help cystic fibrosis?

Answer 9

It helps by making it easier to breathe by inhaling oxygen through a mask

Question 10

How does physiotherapy help cystic fibrosis?

Answer 10

It helps to loosen the thick, sticky mucus from the lungs which reduces infection because it helps prevent mucus blocking the air passages

Question 11

What is genetic variation?

Answer 11

Characteristics that are inherited from parents e.g eye colour, nose shapr