At incubation temperatures above 32°C inhibit the genes on the Z chromosome that produce proteins necessary for male development.
The development of male or female offspring depends on the inheritance pattern from parents where usually, the se×-determination is dependent on the male parent.
In the case of the Australian dragon lizards which have a ZW se×-determination system;
The above information shows that se×-determination occurs on the second Z chromosome.
However, the expression of genes for the proteins for male development is dependent on incubation temperature, where temperatures above 32°C inhibit the genes necessary for male development, thus allowing for expression of female development genes.
Therefore, at incubation temperatures above 32°C inhibit the genes on the Z chromosome that produce proteins necessary for male development.
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The development of a ZW genotype occurs when incubation temperatures are above 32°C because this temperature inhibits the development of a ZZ genotype.
Factors such as temperature, pressure, etc. can inhibit the action or development of a gene while favoring the expression of another. These slight differences are one of the main causes for genotype and phenotype characteristics.
This likely occurs in the case of Australian dragon lizards because an egg incubated above 32°C causes this egg to become a female lizard.
Based on this, it is likely this high temperature favors the expression of the ZW gene while inhibiting the development of a ZZ genome that would lead to a male lizard.
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