1a3 marks
a)
Complete Table 1 by putting a tick (✓) in the correct column to say which characteristics in humans are determined by the environment, inheritance or both.
Table 1
| Caused by the environment | Caused by inheritance | Caused by both | |
| Skin colour | |||
| Eye colour | |||
| Height | |||
| Blood group | |||
| Scars | |||
| Having attached or detached earlobes |
[3 marks]
1b2 marks
b)
Complete the sentences
Choose words in the box.
| Phenotype Mutations Replications Genotype Evolution |
Within human populations everyone has different characteristics, this is called variation.
Differences in the DNA causes different characteristics. The DNA in genes changes due to events called _______________ . When this happens it can sometimes, but not always, lead to changes in the _______________ .
[2 marks]
1c2 marks
c)
Some scientists investigated variation in pea plants growing in a garden.
They counted the number of peas in each pod, as shown in Figure 1.
They did this for all 49 plants in the garden.
Figure 1
Give one environmental factor and one other factor that might affect the number of peas in a pod.
[2 marks]
1d3 marks
d)
Table 1 shows the data that the scientists collected.
Table 1
| Mean number of peas in each pod | Number of plants |
| 5 | 17 |
| 6 | 14 |
| 7 | 8 |
| 8 | 10 |
Using the axes in Figure 2, complete the bar chart of the data in Table 1.
You will be awarded marks for:
-
- Correctly plotted bars
- Labelling both axes
Figure 2
[3 marks]
Did this page help you?
