题目

AaBb和aaBb两个亲本杂交，在两对性状独立遗传、完全显性时，子一代表现型中新类型所占比例为 （    ） A.1/2           B.1/4             C.3/8           D.1/8 答案：B—Anyang is a famous city ____has a long history and rich culture . ---I hope I can visit it some day in the future . A.what   B.who  C.which  D.whose