I'm confused here, I'd always thought that Cystic Fibrosis was a classic Mendelian recessive and a quick look at Wikipedia suggests that's correct. If you want

I'm confused here, I'd always thought that Cystic Fibrosis was a classic Mendelian recessive and a quick look at Wikipedia suggests that's correct. If you want to get rid of an autosomal recessive gene through embryo selection just make a few blastocysts and only implant one that doesn't carry any copies of the allele you don't like. If you do have a gene with a number of copies on each chromosome, like the one for amylase say, the number of copies of one type or another don't generally have enough of an effect to get too worked up over it?