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CAIE A-Level Biology A2 16.1.2 Homologous Pairs of Chromosomes Questions

Explain homologous pairs of chromosomes using evidence from each question and mark scheme.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • Explain homologous pairs of chromosomes.

CAIE A-Level Biology A2 16.1.2 Homologous Pairs of Chromosomes Questions question 1

[Maximum number: 4]

Question (a)

(a)

The house mouse, Mus musculus, has a diploid number of 40 chromosomes.
Fig. 2.1 shows 6 of these chromosomes.

Fig. 2.1

Fig. 2.1

Identify one pair of homologous chromosomes on Fig. 2.1 by drawing circles around two chromosomes.

[ 1 ]

Question (b)

(b)

Fig. 2.2 shows the banding pattern of chromosome pair 11 of M. musculus. The banding pattern is obtained by staining.

Fig. 2.2

Fig. 2.2

[ 3 ]

Question (i)

(i)

Explain why chromosomes, such as those in Fig. 2.2, are described as a homologous pair.

[ 3 ]
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