The deletion of DNA during translation. Mutations occurring during the blastula stage. DNA exposed to radiation after the birth of the organism. Failure of homologous chromosomes to separate during meiosis.
I gave my students this multiple choice question: Which of the following would most likely result in an abnormal chromosome number?

Only one answer is correct among these 4 choices:
- The deletion of DNA during translation.
- Mutations occurring during the blastula stage.
- DNA exposed to radiation after the birth of the organism.
- Failure of homologous chromosomes to separate during meiosis.

Could you tell me which one is correct?

Failure of homologous chromosomes to separate during meiosis.