"Όταν γεννηθεί ένα παιδί από άσπρο και μαύρο γονέα...το παιδί αυτό για να γίνει ολότελα μαύρο θέλει μια γενιά για να γίνει ολότελα άσπρο επτά γενιές."Huh!?Δεν έχω ιδέα από πού έχει προκύψει αυτή η -δοσμένη ως αξίωμα- και ομολογουμένως "εκπληκτική" άποψη. Polygenic inheritance: A *NON-MENDELIAN* form of inheritance in which a particular trait is produced by the interaction of many genes. Polygenic inheritance refers to the kind of inheritance in which the trait is produced from the cumulative effects of many genes in contrast to monogenic inheritance wherein the trait results from the expression of one gene (or one gene pair). In humans, height, weight, and *SKIN COLOR* are examples of polygenic inheritance, which does not follow a Mendelian pattern of inheritance. http://www.biology-online.org/dictionary/Polygenic_inheritanceHuman pigmentation:https://docs.google.com/viewer?pid=bl&srcid=ADGEESgqcBx3JCIfB3vDFD-cdGX7olzuSyqF-xwCiMSNKGtrQgAEsOLAFLTfaJVWW3gMNblmPhIw32ej2BoRcdl M1Lnku43mGxO_JFDHxx0msUDPLH4H8PKBpV11DhLfRxy6rSyFE wZt&q=cache%3Ar4FIN782n0EJ%3Awww2.mvcc.edu%2Fusers%2Ff aculty%2Frthomas%2FBi%2520102%2FNon-Mendelian%2520Genetics.ppt%20&docid=806a20b5f237129b5601df9a128a9aec&a=bi&pagenumber=24&w=799εν αντιθέσει με:http://en.wikipedia.org/wiki/File:Mendelian_inheritance.svgΕπίσηςWhen a "white" and a "black" mate, their child will be an intermediate combination of the all light skin color genes of one parent and the all dark skin color genes of the other parent. (Pigment-producing skin color genes may vary in potency which explains the reason several offspring of a white and a black may differ slightly in shade from one another.) This child is a true "mulatto".When a "white" and a "mulatto" of any degree mate, the situation is different. The light skin color genes from the white parent and the light and dark skin color genes from the "mulatto" parent can combine in any combination. There are at least three pairs of genes at work in skin color inheritance so many combinations are possible. With reference to Belief Statement 6, as long as one parent is "white" and is contributing light skin color genes, the child will always be lighter in color than the other mulatto parent whether dark or light-complexioned.When two "mulattoes" of any degree mate, each contributes both light and dark skin color genes. The child can get all or most of the dark skin color genes from both parents and be darker than either parent; the child can get all or most of the light skin color genes from both parents and be lighter than either parent; the child can get any combination of light and dark skin color genes from both parents and be whatever color that combination dictates.
