Question

谁帮我把这句话的语法结构分析一下

By analysing the genetic code – which is the set of rules which translate DNA into proteins and does not alter as it is passed down through generations – they note that the number 37 crops up several times.

Answer 1

By analysing the genetic code 状语，
which is the set of rules定从修饰code，

which translate DNA into proteins定从修饰rules，
and does not alter前一个定从的并列谓语（也就是which is the set of rules and does not alter),
as it is passed down through generations伴随状语修饰动词alter,
they note 主句的主语+谓语动词
that the number 37 crops up several times 宾语从句，
从句里crops up短语动词作谓语不及物， several times状语。