100% het something meaning that is certainly heterozygous for that genetic trait.
for example:
if you breed an albino with a normal you obtain only normal heterozygous albino...it sure that an hatched baby for this pair is an het albino(100% het).
if you breed an albino with an het. albino you can obtain only albino and normal het. albino(100%het).
if you breed het x het you can obtain 25%albino 50%het albino and 25%normal but because of het and normal appear to be normal...a normal have 2 chances on 3 to be an het(aka 66% possible het).
if you breed het x normal you can obtain normal and het.albino and you have 50% possible het.
when you read 100% het it refers to a "normal" certainly het. :like a baby born by pairing homozygous x normal or homozygous x heterozygous(or some combo that necessary produce it).
when you read 50% or 66% or simply "possible het" should mean that it came from a pairing that produce normal and het whitout visual differences(like het x het or het x normal).
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