Think of that fact as a marketing funnel. Some number of women will make a prioritization decisions. Some will choose to focus 100% on child rearing. Others will focus on career. Other will balance both.

Of the women who focus on career, some are in work environments that are family-friendly and will thrive. Some strive. Others are in environments where not being able to do hackathons or do conference calls at 9PM will close doors to career advancement.

Unless you're a well-researched person who can cite real research, genetic arguments are just anecdotes or vague facts interpreted through a journalists' lens. We should focus research in this area on the anti-patterns -- house husbands. What happens to men in their careers when they take a few years away from the workforce? My guess is a story similar to what we see with women.