The so-called photic sneeze reflex, AKA the Autosomal Cholinergic Helio-Ophthalmic Outburst, abbreviated" ACHOO" … yes, seriously… is experienced by about 1 in 4 people, leading scientists to believe it is genetically heritable.

所谓的“强光喷嚏反射”，又称常染色体胆赫里奥眼突出症，简称“Achoo”… 是的，讲真… 大约有四分之一的人经历过，这使得科学家它是会遗传的。

The paired and replicated chromosomes are called bivalents or tetrads, which have two chromosomes and four chromatids, with one chromosome coming from each parent.

配对和复制的染色体被称二价体（也称四分体），它们有两条染色体和四个染色单体，每个亲本都有一条染色体。

The paired chromosomes are called bivalent or tetrad chromosomes.

成对的染色体称二价体（也称四分体）。