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IB Biology HL 2.3.11 Crossing over, chiasmata and variation Question Bank

Practise IB Biology HL 2.3.11 by analysing crossing over and meiosis mechanisms that generate genetic variation.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Describe chiasma formation and exchange between homologous chromatids.
  • Evaluate how recombination and sexual reproduction create genetically varied gametes.

D2.1.11—Meiosis generates variation question 1

[Maximum number: 2]

Hemophilia is a sex-linked disease that affected some members of royal families in Europe during the 19th and 20th centuries.

Figure for Question D2.1.11—Meiosis generates variation question 1 — IB Biology HL

Question (a)

(a)

The diagram shows the structure of two chromosomes after the first division of meiosis, assuming that there was no crossing over or chiasmata formation.

Figure for Question (a) — IB Biology HL
[ 2 ]

Question (i)

(i)

Draw the same chromosomes to show their structure at the same stage of meiosis if there had been one chiasma between two gene loci.

[ 1 ]

Question (ii)

(ii)

State the stage of meiosis where chiasmata formation may occur.

[ 1 ]
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