If a copy of a gene is a bit different from the original, that's called a genetic mutation.
如果一个复制的基因与原来的有些许不同，那就叫做基因突变。
2
For example, the hereditary hemochromatosis mutation protects carriers from iron-deficiency because the mutated gene allows increased efficiency of iron absorption.
例如，因为突变的基因可以提高铁的吸收效率，所以遗传性血色素沉着病突变可以保护带菌者不缺铁。
3
The objective is to analyse the mutation of K17 gene in a pedigree with steatocystoma multiplex.