A gamete has one allele for each trait. This is because gametes are haploid, meaning they have only one set of chromosomes.

Here's why:

* Diploid organisms: Have two sets of chromosomes, one from each parent.

* Meiosis: The process of creating gametes (sperm and egg) involves a special type of cell division called meiosis, which reduces the number of chromosomes in a cell by half.

* Gametes: Therefore, each gamete receives only one chromosome from each pair, resulting in a haploid cell with one allele for each trait.

This is important for sexual reproduction because when a sperm and egg fuse during fertilization, the resulting zygote (and eventually the offspring) receives one allele from each parent for every trait.