Bezalel: no, it’s simple math. If one parent is a carrier, then about 50% of their kids should be carriers also. Since DY will weed out cases where both parents are carriers, only 2/3 of couples will have a parent who is a carrier (assuming a 50/50 split at first of carriers). Half of the children from these couples will be carriers. 1/2 of 2/3 is 1/3. For the 1/3 of couples where neither parent is a carrier, all their kids won’t be carriers. Therefore, one generation in, you go from 50% carriers to 33% carriers.
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