Joseph,
The contradiction is that the verses in question are completely impossible scientifically. Genes don't work this way. The story sounds like an ancient, ignorant goat herder trying to control heredity without any working knowledge of how such traits are inherited. It does not sound like a story from god, who would know exactly how traits are inherited.
Taking the story as it stands, it breaks the laws of genetics and therefore is either an inaccurate account, or is just a fictional fable about a supposed miracle. From reading the account, Jacob didn't seem to think of it as a miracle... he viewed the method as just common sense of the time. Since the Bible is promoting this "common sense", which we know contradicts known scientific facts, it is wrong.
You can prove to yourself that this account contradicts the facts by running the experiment yourself. The exercise is left to the reader.
rem