Here's why:
* Diploid vs. Haploid: Normal body cells (somatic cells) have a diploid number of chromosomes, meaning they have two sets of chromosomes (one from each parent). In guinea pigs, this number is 64.
* Meiosis: Egg cells are produced through meiosis, a type of cell division that reduces the chromosome number by half. This means that each egg cell contains a haploid number of chromosomes, which is 32 in guinea pigs.
Therefore, a guinea pig egg has 32 chromosomes.