Question: What exactly are the types of frogs that can spontaneously change gender in a single-sex environment, that Grant was referring to?
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Answer: To be exact. Grant is reffering to "amphibian DNA" most commonly found in species of West African frogs. It is the amphibian DNA that allows the frog to change gender. It is not specifically related to frogs only.
XIII
This type of behavior has been observed in survival situations. Unbalanced populations.