Does "within genders" mean "within people of same sex"?

Context:

Alexandra Kautzky-Willer, head of the Gender Medicine Unit at the Medical University of Vienna in Austria, agrees that things aren’t so simple. “There are differences between men and women when you look in large groups, and these are important for diagnosis and treatment,” she says. “But there are always more differences within genders. We always need to look at culture, environment, education and a person’s role in society,” she says.

MOre:
https://www.newscientist.com/article/dn28582-scans-prove-theres-no-such-thing-as-a-male-or-female-brain/