I have heard of this, but honestly do not know enough about it to comment on whether there is any real evidence in support of it. I can"t really see a reason why it would occur this way, but then the knowledge of many aspects of reproductive genetics is limited.
That said, it is true that for some embryos in non-placental animals (that develop outside of the mother), the local environment around the embryo plays an important role in directing their development. As an example, whether a male or female develops in some species of turtles and other reptiles is determined not by genetics but by the temperature at which their early development occurs.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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