Intervensi biology Form 5 chapter 6

1. INTERVENTION – BIOLOGY CHAPTER 15
CHAPTER 15 : VARIATION
1.
The photographs show some of the traits in human.
a. What is the term used for the traits ?
………………………………………………………………………………………………………..
b. Define the following terms :
i. Variation :………………………………………………………………………………………
ii. Mutation :……………………………………………………………………………………….
2. Fill in the blank with the correct answer from Table 1 .
a. Individuals belonging to the same population or ……………………… shows
………..…………………… in characteristics within them.
b. These differences show the …………………………. within the species.
c. Variation is the result of random combinations of …………………. .
· Species
· Differences
· Variation
· Gene
TABLE 1

2. INTERVENTION – BIOLOGY CHAPTER 15
3. Complete the table to show the differences between continuous variation and discontinuous
variation .
Aspects Continuous/discrete variation Discontinuous variation
Characteristics Individuals exhibit a range of
characteristics
There is a sharp ………………..
between characteristics of
individuals
Differences Not easily distinguished …………………………………….
Genes Combined effect of many
…………………
By ………………. or a few genes at
work
Environmental
factors
Affects the way the genes express
themselves
…………………………………….
…………………………………….
Examples Height, ………………………,
………………………………..
ABO blood group,
……………………………
4.
a. State 3 genetic factors that affect variation
i.……………………………………………………………………………………………….
ii……………………………………………………………………………………………….
iii:………………………………………………………………………………………………
b. State 3 environmental factors that affect variation .
i.……………………………………………………………………………………………….
ii……………………………………………………………………………………………….
iii:………………………………………………………………………………………………

3. INTERVENTION – BIOLOGY CHAPTER 15
5. Graph shows a type of variation in human .
Number of
individuals
Characteristic
(a) (i) Based on the graph , name the type of variation .
…………………………………………………………………………………………
(ii) Give a reason for your answer in 1(a) ( i ).
……………………………………………………………………………………………..
…………………………………………………………………………………………..
( b ) Give one example for the characteristic.
………………………………………………………………………………………………..
( c ) Explain the environmental factor that affects the variation .
……………………………………………………………………………………………………
…………………………………………………………………………………………………….