Question

gregor mendel developed several laws of heredity over the course of his genetic research. what does the first law of heredity, the law of segregation, state about genes?
o a. mutations can only occur in heterozygous organisms.
o b. alleles of different genes separate independently of one another during gamete formation.
o c. two alleles for a trait separate when gametes are formed.
o d. dominant alleles are always more likely to be inherited

Explanation:

孟德尔第一定律即分离定律，其内容是在形成配子时，成对的等位基因彼此分离。选项C描述的“一对性状的两个等位基因在形成配子时分离”符合分离定律。选项A说突变只发生在杂合子中，错误；选项B是自由组合定律内容；选项D说显性等位基因更易遗传，错误。

Answer:

C. Two alleles for a trait separate when gametes are formed.