2 papers analyzed
The question of whether all embryos start as female is a topic of interest in developmental biology. This inquiry delves into the initial stages of embryonic development and the differentiation of sex in various species.
Gyrodactylid Embryonic Development:
Human Preimplantation Embryos:
The research indicates that in gyrodactylids, there is no clear evidence that embryos start as female, as the first-born daughters and subsequent offspring are morphologically indistinguishable at early stages. In humans, sex can be determined at the preimplantation stage, indicating that embryos do not universally start as female. Thus, the notion that all embryos are female first is not supported across these species.
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