Avoid 2 bad genes: One way to avoid having a child who inherited a bad trait, is to make sure that NOT both parents carry genes for that bad trait. So, a woman carrying a thalassemia gene (beta mutations are on chromosome 16, or alpha on 11) wants to marry a man with NO thalassemia mutations. Likewise, a man with G6PD (on chromosome X) wants to marry a woman with no G6PD. A doctor can check both the man and woman.
Answered 4/22/2018
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