单倍体中含有X-性染色体和含有Y-性染色体的性比基本相同。
The gender ratio of X chromosome and Y chromosome was almost same in the haploid.
像许多有性繁殖的物种一样，人类有特殊的性染色体。
Like many sexually reproducing species, humans have special gonosomes.
布莱克本在研究一种简单的池生生物四膜虫的染色体时，获得了一个突破性的发现。
The first hint of a breakthrough came when Blackburn was studying chromosomes in a simple pond-dwelling organism called tetrahymena.
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