With most of the same genes, how do lizard siblings end up so different?

An evolutionary biologist suggests that hormones, such as testosterone, play a key role in shaping gene expression in ways that are unique to each sex as an organism develops to adulthood.

from Top Health News – ScienceDaily http://bit.ly/2mLTIE0
from Tumblr http://bit.ly/2lzO4o8