Lincoln is colour blind.

We all have two copies of our genes, one from mom and one from dad. Sickle cell is an autosomal recessive disorder, meaning it takes two "misspelled" genes to cause disease/symptoms. If you are a carrier you have one misspelled gene, so you have a 50/50 chance of passing that misspelled gene to each of your children. Since your husband isn't a carrier, he has a super low chance of passing on a misspelled sickle cell gene. Since your children probably won't inherit two misspelled genes, they have <1% of having the disease. But because they have a 50/50 chance of inheriting a misspelled gene from you, they have a 50% of being a carrier themselves! Things really change if your husband is a carrier too. Hope that helps

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