Which statement by a pregnant woman indicates correct understanding of autosomal recessive inheritance teaching when both husband and wife have one sickle-cell trait gene?
1. "If this baby carries the trait like I do, then my next child will have sickle-cell anemia."
2. "If this baby carries the trait like I do, then my next child still has a 25% chance of carrying the trait."
3. "Regardless of whether this baby carries the gene, my next child still has a 50% chance of carrying the trait."
4. "Regardless of whether this baby carries the gene, my next child still has a 75% chance of carrying the trait."
3
Rationale:
1. Each child has an equal chance of being a carrier or having the disease.
2. Each child has an equal chance of being a carrier or having the disease.
3. Inheritance patterns for autosomal recessive inheritance when both parents are carriers of the trait provide identical inheritance risks to each pregnancy, regardless of which inheritance patterns siblings received. Thus, all offspring have a 50% risk of being a carrier, a 25% possibility of receiving an altered disease-producing gene from both parents and experiencing the disease, and a 25% chance of receiving an unaltered gene from each parent and being unaffected.
4. Each child has a 50% chance of carrying the trait when both the mother and father carry the gene.
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