Sex is good for us, but it is a compromise. For the benefit of being able to produce genetically variable offspring, we must pay the cost of passing on only half our genes to each of them. Whilst evolutionary biologists still puzzle over the precise details of why the benefits of sex so frequently seem to outweigh the costs (Neiman, Lively, & Meirmans, ), one major challenge to sexual reproduct...

Numerous genes are expressed preferentially in spermatids, the haploid germ cells of the testis. Although some have defined, spermatid-specific roles, the expression and function of the products of most of these genes are not restricted to spermatids [1]. Examples include transcription factors that have defined functions elsewhere, kinases, metabolic enzymes, and so on. Recently, another group ...