Today's morning lesson was on nasal congestion with a smattering of heredity/genetics. Elena awoke because she was having trouble breathing through her nose and inquired why. I explained that the two most likely explanations were illness and allergies. We discussed the difference between these--how one is a helpful effort to fight off a problematic foreign invader and the other is an immune system over-reaction to something that really isn't dangerous.
She inquired why she would have allergies (since I don't think she's sick and genuinely think she may finally be developing allergies like the rest of the family) and we discussed what genes are briefly and how they code for different aspects of the phenotype, including allergies.
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