2022HSCShort answer

Q24 (b)

2 marks

Question

Birth defects in humans can be caused by chromosomal abnormalities.

Maternal age (years)	Prevalence of chromosomal abnormalities (per 1000 births)
20	1.5
30	3
35	8
40	22
45	38

Outline the trend shown in the data.

Try the question before revealing the answer.

Solution

Criteria	Marks
Outlines the main features of the trend	2
Identifies a trend	1

Sample answer:

As maternal age increases, the prevalence of chromosomal abnormalities increases. After the age of 30, there is a rapid increase in prevalence – it is increasing at an increasing rate.

Supplied marking guidance · human reviewed

Compare this with your working, not only your final sentence.

Syllabus alignment

Module 8 · Non-infectious Disease and Disorders

Causes and EffectsRepresent incidence, prevalence and mortality data for non-infectious diseases.

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