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This short article focuses on the ability of parents to "choose" a healthier embryo with less risk of disease. The example the article gives is a gay couple planning on having a child. Through in vitro fertilization, a group of a female's eggs are fertilized by half the sperm of one father and the other half of the other father. In vitro fertilization is not the groundbreaking aspect of this article. In vitro is quite common and has been around for some time. The part that of this article new and interesting is the fact that the couple will have the ability to pick which egg is implanted into the surrogate mother. Through a firm called  "Genomic Prediction," the lucky embryo with the least risk for developing disease can be picked. How does Genomic Prediction figure out which egg is the "healthiest?" The article states, "It (Genomic Prediction) is screening embryos for almost 1m single-nucleotide polymorphisms (SNPs). These are places where individual genomes routinely differ from one another at the level of an individual genetic letter" (Economist). Basically the article states that small changes in individual SNP generally do not make that much of a difference. It is the complete letter changes that affect someone's risk for developing a disease such as Tay-Sachs disease. Diseases such as this one are exactly what these SNP tests are scanning the embryos for which allows parents to pick the healthiest one possible.


https://www.economist.com/science-and-technology/2019/11/07/modern-genetics-will-improve-health-and-usher-in-designer-children

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