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IB Biology HL D2.1.11 Meiosis Generates Variation Questions

Analyse how non-sister chromatid exchange, random assortment and fertilisation create new allele combinations in IB Biology HL D2.1.11.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Describe chiasma formation and DNA exchange between non-sister chromatids of homologous chromosomes in prophase I.
  • Explain how crossing over, random bivalent orientation and fertilisation create varied gamete or offspring allele combinations.

IB Biology HL D2.1.11 Meiosis Generates Variation Questions 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 IB Biology HL D2.1.11 Meiosis Generates Variation Questions 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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