Learn Punnett squares! They're the most useful tool in determining genetic outcome since a slightly less useful tool in determining genetic outcome!
http://www.schools.utah.gov/CURR/Sci...er/punnett.htm
Hope that helps. Play around with them a little bit, once you get the hang of the concept you can wow your friends by theoretically combining the genetic potentials of any two donors! You'll be the envy of all you meet! You'll get attractive women to fall head over heels for you!
Trust me, it worked for me.
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