A simple calculator to calculate the frequency of a recessive allele
Some suggestions:


call variables this_way not thisWay
use less comments
put your interaction with user into separate functions
if code will be splited properly you will be able to user return and while True: instead of test variable
return object or dict from calculate_frequency rather than long tuple
don't create strings like that:

str(hzDominantNum)+'/'+str(total)+' ('+str(hzDominantFreq)+'%) are normal (homozygous dominant).\n'


this is mutch better:

'%f/%f (%d%%) are normal (homozygous dominant).\n' % (hzDominantNum, total, hzDominantFreq)


if you have to run this as a program do it this way:

def main():
    print "test"

if __name__ == "__main__":
    main()