Review_Of_Blood_Genetics

Basic Genetics of Traits
Remember: All humans have two copies of every gene - one from their mother and one from their father.

__P____henotype__- the expression of genes (traits) (An example is blood type, detached or attached ear lobe, eye color, intelligence, etc. )
====__Dominant-__ when one copy of a gene "overpowers" the other and is ultimately expressed (For example, in humans, the unattached ear lobe gene copy is dominant over the attached ear lobe gene copy, RR or Rr.) The opposite of __Dominant__ is __Recessive__. This is where there must be two copies of the recessive gene copy in order for the recessive trait to be expressed. (For example, in humans, the attached ear lobe gene copy is recessive to the attached ear lobe gene copy, rr.)====


 * Figure 1. Dominant/Recessive: Unattached vs. Attached Ear Lobes in Human (Dominant/Recessive)**

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