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Infection and immunity Whether an infection passes or stays is decided as much by the host as by the microbe — and the host genes that decide it are usually the o… Liver The organ people only think about when a blood test comes back odd. Two of its commonest numbers are partly inherited, which is why a raise… Fertility Genetics has a great deal to say about the timing of reproduction across populations and almost nothing to say to one person trying to conceive. Bones and fractures Bone density is one of the more heritable things about a body — and the thing that actually matters, whether it breaks, is much harder to p… Alcohol and the flush One of the few places where a single variant is visible in the mirror. Exercise and muscle The "sprinter gene" is the most oversold result in consumer genetics. Menopause The one reproductive event with a date attached, and the date is partly inherited. What follows from that is smaller than the internet suggests. Allergies Allergy runs in families and rose too fast for genes to explain. Both of those are true, and holding them together is the whole subject. Brain and memory What actually changes in a brain over a lifetime, and which of it is written down in advance. Depression and stress The field that taught genetics its hardest lesson about single genes.