In the 1960s, French scientists discovered that reptiles in Senegal are completely dependent on temperature in
To solve the riddle, Sarah Whiteley fromThe University of Canberra in Australia and her colleagues performed genetic sequencing on unhatched bearded lizards incubated either at 28 ° C - cool enough for ZZ embryos to hatch into males, or at 36 ° C - warm enough for ZZ females to emerge.
It turned out that at a temperature of 36 ° C in embryosZW females had “sharply” different active genes at major stages of sexual development compared to ZZ females. There are two different sets of genes that give rise to a female bearded lizard. In ZZ females, genes that “wanted” to code for male development were forcibly turned off, and genes for female development were turned on.
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