How do Geckos Determine Sex?

Most gecko species reproduce sexually and both a male and female are required for successful breeding. But how are the sexes produced? How does a gecko egg “know” to produce a male or female hatchling? Answering these questions depends upon which species of gecko you are talking about, because geckos have come up with a variety of ways to determine sex.

The evolution of sex-determining systems in geckos. Colored circles at the tips of the phylogeny …

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