* Yes, most cells in your body have alleles for every trait. This is because almost all cells in your body are diploid, meaning they have two sets of chromosomes.

* Each chromosome in a pair carries an allele for a specific trait. So, for example, you have two alleles for eye color, two alleles for hair color, and so on.

Important Note: There are some exceptions to this:

* Gametes (sperm and egg cells) are haploid. They only have one set of chromosomes, so they carry one allele for each trait. This is because when sperm and egg combine, they create a new diploid individual.

* Red blood cells are anucleate. They lack a nucleus, and therefore lack chromosomes and alleles.

* Some cells in the immune system undergo a process called "V(D)J recombination" which involves shuffling and rearranging gene segments. This allows for the creation of a vast diversity of antibodies, but it doesn't change the basic principle that most cells have alleles for every trait.

So, in general, yes, most cells in your body have alleles for every trait. This is a fundamental concept of genetics and helps explain how traits are inherited from parents to offspring.