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IB Biology SL A1.2.10 Conservation of Genetic Code Questions

Explain how the 64 codons have nearly the same meanings across life and how conserved genes for transcription, translation and ribosomes support common ancestry. Describe how synonymous mutations can preserve amino acid sequences.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain that the 64 codons have nearly the same meanings across life.
  • Use conserved genes for transcription, translation and ribosomes as evidence supporting common ancestry.
  • Explain how synonymous mutations can preserve an amino acid sequence.

IB Biology SL A1.2.10 Conservation of Genetic Code Questions question 1

[Maximum number: 1]

Some yeast genes can be replaced by human genes that then continue to produce the same human proteins in the yeast cells. Which statement helps to explain this evidence?

A

The DNA of yeast and humans is identical.

B

Yeast and humans have the same number of chromosomes.

C

The genetic code is universal.

D

Yeast and humans are both eukaryotes.

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