Explain why a person with an allele for a particular trait may not have a phenotype that shows the trait.

This is because maybe that allele for the trait is recessive and the person is heterozygous. If the person is heterozygous, it means that they have both the dominant and recessive allele for a trait. This matches the requirements of having the allele for a particular trait but not showing the phenotype of that.

Explanation:

i need the a b or c but mental disorders include repetitiveness,unable to listen, wanting to kill people, thinking that you are perfect, sexuality toward the wrong age types younger than you like a child bad reputations cutting yourself abuse! these are sad but these are true! the titles for some of these are ptsd and adhd. you need to go to jail or get an expert counselor if you face any of these problems or if you have indeed been involved!