2024HSCShort answer

Q33 (b)

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.

Draw the chromosomes of the four possible gametes after crossing over for the Jack Jumper ants occurs. Include the alleles for each gene.

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

Uncropped source page 35 for question 33.b; requires human review and cropping — Reviewed visual · source page 35

Try the question before revealing the answer.

Solution

Criteria	Marks
Draws all four possible chromosomes correctly for the gametes	2
Provides some relevant information	1

Sample answer:

[The sample answer is a chromosome diagram in the source.]

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.

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