the science that studies how traits are inherited through the interactions of alleles (a)  

the passing of traits from parent to offsprint

the genetic make-up; the actual gene pair

the physical or visible appearance of an organism; a trait we can see

blue eyes, curly hair

Tt, BB, rr

controls the trait; you only need one gene for the trait to show up in an organism

you need 2 genes for the trait to show up in an organism

the different forms of a trait that make up a gene, R OR r

purebred; the same gene pair; RR