原题是：How many different gametes can an RRYy parent form?What

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原题是：How many different gametes can an RRYy parent form?What are they?
中文翻译过来就是：一个RRYy的亲本可以组成多少种不同的配子?它们都分别是什么?

可以组成两种配子,RY和Ry.
再问：为什么不是三种：R Y y
再答：配子是指生物进行有性生殖时由生殖系统所产生的成熟性细胞。
再答：配子是指生物进行有性生殖时由生殖系统所产生的成熟性细胞。
再答：配子是指生物进行有性生殖时由生殖系统所产生的成熟性细胞。
再答：配子是指生物进行有性生殖时由生殖系统所产生的成熟性细胞。
再答：两个配子(一个精子和一个卵子)所结合的受精卵就叫合子. 所以一个生殖细胞中必须包含所有不同原的基因各一种，两个生殖细胞的基因数相加就变成正常的体细胞数。即二倍体。

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