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production by is expected to be balanced with even proportion of y-chromosome bearing (leading to son in ). This new study in shows that sperm can be tweaked in response to sexual competition.
📄 Firman et al. (2020) Sperm sex ratio adjustment in a mammal: perceived male competition leads to elevated proportions of female-producing sperm. Biology Letters 16:20190929 dx.doi.org/10.1098/rsbl.2019.0

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