Posted by:
metalpest
at Wed Sep 21 12:00:59 2005 [ Email Message ] [ Show All Posts by metalpest ]
I think you are missing something there. It is twice as probable that the normal offspring will be hets rather than normal. As for your card analogy, lets try this:
king is homozygous recessive (albino)
queens are hets
jack is homozygous dominant (normal)
Draw one card for each egg. You cannot tell the difference between the queens and the jack. Each card is placed back after the draw so the first draw has no effect on the previous. Now, if you drew a queen or jack, you have a normal looking offspring. How likely is it that you drew a queen or a jack on that normal offspring? Well, there are two queens, and only one jack, so it is TWICE as likely that the normal is a het. 66% is twice of 33%, and approx. add up to 100%. If there was only one queen, then it would be 50/50. Half of your offspring are expected to be hets, and only 1/4 are expected to be normal. Much more likely that you have hets than normals.
Now, 50% hets come in when you breed het to normal. One albino gene and one normal gene from the het parent to disperse, so half pick up the albino gene.
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RE: The 66% Het Problem - metalpest, Wed Sep 21 12:00:59 2005