Does Genesis 30:25-43 defy genetics? Genesis 30:25-43 is the story about Jacob's flock increasing by making streaks on Laban's goats using wood branches, so that


  they mated in front of the branches. And they bore young that were streaked or speckled or spotted. (Genesis 30:39, NIV)


This just doesn't make sense. It doesn't even come close to the Lamarck's Evolution Theory. How is this possible?
It is possible that the genetic engineering techniques practiced were part useless and part real.  The attempt to imprint color on the hide of sheep by seeing stripes during intercourse is folklore. However, by coincidence/destiny the majority of sheep who underwent this silly attempt may have had recessive genes that produced color in subsequent generations without any other divine influence.   Also more believable is that possibly some of the stronger animals that Jacob segregated for procreation may have had recessive genes of color.  The result is that with Jacobs meddling he may have artificially increased the procreation of animals with colored recessive genes, effectively increasing his wealth by his efforts as foolish as they may have been in part.  His ability to perform this genetic engineering may be in part with what he subconsciously recognized in breeding history, partly shaped by folklore and substantially blessed by God.

For a more technical analysis you might be interested in this A Mendelian Interpretation of Jacob's Sheep