Free ear lobes are dominant, attached ear lobes are recessive in
humans. If the father has attached ear lobes & the mother free ear
lobes, the children will have free lobes if the mother is pure for
this trait (homozygous dominant) If the mother was heterozygous, the
children will have an even (50 - 50) chance of having free or attached
lobes. If both parents are hterozygous, what is the phenotypic ration
for the possible offspring? If both parents have attached ear lobes
what are the odds (perscentages) of having children with attached
lobes?

Hi meanie222,
let's say that
free ear lobes= F
attached ear lobes= f
parents gametes in a punnet square:
  l F  l  f
--l----l-----
F l FF l  Ff
-------l----
f l Ff l  ff
as a result the phenotypic ratio is 1(attached ear lobe): 3 (free ear lobe)
if both parents have attached ear lobes, they have to be homozygous
(for the recessive trait to be shown phenotypically in this case it
has to come in a double doze) thereby 100% chance of getting child
with attached ear lobe.