Variation

Question 0

Organisms living in different habitats need different……?

Answer 0

Adaptions

Question 1

What does Darwin’s theory explain?

Answer 1

explains how species of living things have changed over geological time

Question 2

How are Polar bears adapted to their habitat?

Answer 2

• white appearance (camo in snow from predators)
• fat and fur for insulation
• minimises heat loss; small surface area to volume ratio
• greasy coat, which sheds water after swimming.

Question 3

How is the Pompeii worm adapted to its extreme environment?

Answer 3

• hydrothermal vents
• thick layer of bacteria to protect it from heat
• hides in papery tube to protect it from predators

Question 4

What is CONTINUOUS VARIATION?

Answer 4

A characteristic that changes gradually over a range if values.

Question 5

Give 3 examples of continuous variables in a human…?

Answer 5

• height
• weight
• foot length

Question 6

Give the definition of discontinuous variation…?

Answer 6

A characteristic of any species with only a limited number of possible values.

Question 7

Give 3 examples of discontinuous variables in a human…?

Answer 7

• gender (male or female)
• blood group (A,B,AB or O)
• eye colour

Question 8

Independent variable

Answer 8

The variable you have control over

Question 9

Dependant variable

Answer 9

What you measure in the experiment and what is affected during the experiment.

Question 10

Control variable

Answer 10

Something that is constant and unchanged in an experiment.

Question 11

What is the term called for repeating your results to make the experiment more reliable?

Answer 11

Replicates.

Question 12

Inherited variation

Answer 12

Variation in a characteristic that is a result of genetic inheritance from the parents.

Question 13

Give 4 examples if inherited variation in humans…?

Answer 13

• eye colour
• hair colour
• skin colour
• lobed or lobeless ears

Question 14

How can gender be inherited?

Answer 14

Because whether you are male or female is a result of the genes you inherited from your parents.

Question 15

Environmental variation

Answer 15

Caused by the surroundings

Question 16

Give 2 examples of features that show environmental variation…?

Answer 16

• language and religion

- flower colour in hydrangeas;these plants produce blue fliers on acidic soul and pink flowers in alkaline soil.

Question 17

Why do some features vary?

Answer 17

A mixture of inherited causes and environmental causes.

Question 18

Give an example of how inherited causes and environmental causes, to cause features to vary?

Answer 18

Identical twins inherit exactly the same features from their patents.
HOWEVER: If you take a pair if twins, and twin ‘A’ is given more to eat than twin ‘B’, twin ‘A’ is likely to end up heavier.