- Humans are a kind of organism
- Traits can be determined by one pair / many pairs of genes in an organism
- Therefore, traits can be determined by one or many pairs of genes in human

Hence, traits can be determined by one or many pairs of genes in human
[Question]In humans, a trait can be determined by one pair or many pairs of
[Context]- Humans are a kind of organism 
- Traits can be determined by one pair / many pairs of genes in an organism