It is simply NOT POSSIBLE to chose an embryo with more than 1 or 2 defined characters. In the beggining of the selection process after in vitro fertillisation there are max. 20 embryos. Out of them usually max. 8 develop well. Let's presume that the blue color of eyes and blond hair are single gene and recessive traits. It means that 1/4 of the emryos will have blue eyes. Now we have just 2 embryos. And out of them 1/4 will have blond hair. So you may have one if you are lucky. So no more choosing. And than you have 20% chance of pregnancy. So it is better to implant more embryos and just stick to only one most important genetic trait and to use this technology only when it is necessary.
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It is simply NOT POSSIBLE to chose an embryo with more than 1 or 2 defined characters. In the beggining of the selection process after in vitro fertillisation there are max. 20 embryos. Out of them usually max. 8 develop well. Let's presume that the blue color of eyes and blond hair are single gene and recessive traits. It means that 1/4 of the emryos will have blue eyes. Now we have just 2 embryos. And out of them 1/4 will have blond hair. So you may have one if you are lucky. So no more choosing. And than you have 20% chance of pregnancy. So it is better to implant more embryos and just stick to only one most important genetic trait and to use this technology only when it is necessary.