Transcript Husky - conwell

Husky
Chihuahua
Grey Wolf
Recall from our selective breeding cases that all dogs
come from the grey wolf (left), and the Husky (top
right) was bred by selecting for medium size, thick fur
coat and high energy.
The Chihuahua (bottom right) also came from the
grey wolf. What traits do you think breeders selected
for the Chihuahua?
1. In selective breeding, humans influence the
course of evolution. What determines the
course of evolution in natural selection?
2. Sometimes when humans change the
environment in which an organism lives, the
organism must adapt over many generations
to survive. In this case, the adaptation is an
unintentional result of human actions. Is it
natural selection or selective breeding?