② autosomal dominant inheritance? Aa or AA? 1/6

③.G-C mutates into A-T? decrease

(2) ① My father's chromosome 2 1 did not move to the two poles during the second meiosis.

② Chromosome analysis of age-appropriate and prenatal fetal cells.

(3) The illness of human body is also the character displayed by human body, and the character is controlled by genes, so it makes sense to say that diseases are all hereditary diseases. However, this view is too absolute. Not all human diseases are caused by genetic defects or changes, but also by external environmental factors. For example, diarrhea caused by Escherichia coli is not a genetic disease.