Genetics make girls play house?

A new study found that girls gravitate towards playing with dolls and such because of genetics, whereas for boys it tends to be more environmental. Ultimately the study was unconclusive in determining which actually DOES affect girls and boys more, genetics or environment. I am not a scientist, but I am a feminist and we have been known to see these science shmience studies differently.
Check it.
In the study, which appears in the July/August issue of Child Development, researchers analyzed the effects of genetic and environmental factors on the gender-role behaviors of a group of nearly 4,000 3- to 4-year-old twins and nontwin sibling pairs.
the study showed that genetics seemed to have less of an impact on whether or not boys adopted masculine-type behaviors, such as playing war games. While environmental factors, such as the boy’s role models or peers, had a bigger affect on their adopting typically male behaviors.
In contrast, genetics had a substantial impact on girls’ gender role behavior, while the environment played a less significant role in girls’ selection of typically feminine behaviors, such as playing with dolls.
My instinct is to say well bite me. What does this mean? And whether girls are genetically disposed to certain characteristics STILL doesn’t justify rigid gendered behaviors!
What do you think? Genetics verses Socialization/Environment?