Distinctions in sociology between sex and gender

What are the distinctions in sociology between the terms sex and gender? What importance does the differentiation between the terms have in modern society? Also discuss gender stratification and provide examples of gender stratification from the U.S. or other societies.  Find a recent news piece (within the last 3 months) related to gender or provide an example of how gender is portrayed in the media (such as advertisements shown on GenderAds.com). Share a link to your selected source or image and describe the connection to the course topics this week (such as sexism or gender roles).