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 am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following would most likely result in an abnormal chromosome number?
Possibilities:
- 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.

Failure of homologous chromosomes to separate during meiosis.