How many genes for single trait are found in each gamete?

Question

How many genes for single trait are found in each gamete?

Answer 1

one and it'll either be dominant or recessive

Answer 2

If you're assuming that any trait is the result of only one gene (which is not true, but I think the question is assuming that), then there would be one in each gamete.

Most organisms outside of bacteria are diploid, so they have two sets of chromosomes.  (Some are polyploid with more than two.)  Each set carries a full complement of genes.  So, if you pick a gene, your cells have two copies of each gene.  But, during meiosis, the copies are split so that each of the resulting gametes is haploid and has only one copy.  This is necessary so that when two gametes combine during fertilization the diploid number is restored.