Question: The cows in a rancher's herd of cattle have been selectively bred to produce milk. Which of the following will cause the next generation of cows to receive the trait for producing large quantities of milk?

  Options: 
 A. nutrients in the cows' food
 B. essential minerals in the cows' water
 C. electrical impulses in the cows' brains
 D. information in the cows' chromosomes
Answer: D