World with core of fluctuating mass, phenotypic differentiation during gestation?

I'm creating a fantasy planet with an interior that has a god phasing in and out of our dimension, adding to and taking away mass in mysterious fashion while keeping everything but the influence of gravity stable, including air pressure. The world will fluctuate from +50% to -50% earth gravity smoothly over the course of 200 years, with humans retaining earth-like lifespans for the most part.

In order to adapt, I would like to know if the following is feasible: a gland within the female detects the current level of gravity and secretes a hormone that influences the development of the fetus. Perhaps fetuses naturally develop for .5gs early, since those bodies require less mass. If the hormone fires, the fetus continues developing until it resembles 1g humans (us), and if it achieves a certain higher concentration the fetus continues developing until it's adapted for a 1.5g environment, possessing thicker bones and muscles, etc. Gestation period would, therefore, vary directly with increasing gravitational force.

posted over 7 years ago

Adam Halatek‭

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