The egg cell contains all 8 chromosomes. The sperm cell contains all 8 chromosomes. The sperm cell provides 4 chromosomes and the egg cell provides 4 chromosomes. The egg cell provides 4 chromosomes and 4 sperm cells each provide 1 chromosome.
I gave my students this multiple choice question: Chromosomes contain the genetic information of an organism. Fruit flies reproduce by sexual reproduction. Most of the cells of a fruit fly have 8 chromosomes. Which statement best explains the source of the chromosomes in a normal fertilized fruit fly egg?

Only one answer is correct among these 4 choices:
- The egg cell contains all 8 chromosomes.
- The sperm cell contains all 8 chromosomes.
- The sperm cell provides 4 chromosomes and the egg cell provides 4 chromosomes.
- The egg cell provides 4 chromosomes and 4 sperm cells each provide 1 chromosome.

Could you tell me which one is correct?

The sperm cell provides 4 chromosomes and the egg cell provides 4 chromosomes.