Why is there two variations of each characteristic?

Please explain :) !!

Answer in the gene for that characteristic cause these different forms. ... These two copies of the gene contained in your chromosomes influence the way your cells work. The two alleles in a gene pair are inherited, one from each parent. Alleles interact with each other in different ways

Offspring acquire a mix of traits from their biological parents. Different organisms vary in how they look and function because they have different inherited information. In each kind of organism there is variation in the traits themselves, and different kinds of organisms may have different versions of the trait.

Explanation:

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answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;