Gregor Mendel<span>, through his </span>work<span> on </span>pea plants<span>, </span>discovered<span> the fundamental laws of inheritance. He deduced that </span>genes<span> come in pairs and are inherited as distinct units, one from each parent. </span>Mendel<span> tracked the segregation of parental </span>genes<span> and their appearance in the offspring as dominant or </span>recessive traits<span>. </span>
An organism's genotype describes the allele combination for a trait (Ee, etc.). Phenotype is the physical appearance of a trait (Eye color, etc).
The external side of the phospholipid bilayer in a mammalian cell contains sphingomyeline, phosphatidyl choline and glycolipids :)