2024HSCShort answer

Q33 (a)

2 marks

Question

Female Jack Jumper ants (Myrmecia pilosula) have a single pair of chromosomes. During meiosis, crossing over occurs. The diagram shows the crossing over and the position of three genes on the chromosomes.

Outline the significance of crossing over for the Jack Jumper ants.

Uncropped source page 34 for question 33.a; requires human review and cropping — Reviewed visual · source page 34

Try the question before revealing the answer.

Solution

Criteria	Marks
Outlines clearly the significance of crossing over in meiosis	2
Provides some relevant information	1

Sample answer:

Increasing genetic variation, which gives the Jack Jumper ant a better chance to survive environmental change.

Supplied marking guidance · human reviewed

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

Syllabus alignment

Module 5 · Heredity

Genetic VariationPredict offspring variation by modelling meiosis, crossing over, fertilisation and mutation.

Spot a problem? Send feedback