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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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