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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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