In mammals, birds and some reptiles, sex is determined by sex-specific chromosomes.  In mammals, the sex-determining chromosomes are called X and Y, and only males have both.  In birds and reptiles, these chromosomes are called Z and W, and only females have both. How are these related to one another and to the rest of […]

World Tourism Day WORLD TOURISM DAAAY! Come and discuss with us, what countries have you been to, what did you do there, did you experience culture shock, what are your recommendations to fellow globe trotters?   Is this the first time you will attend a presentation with us? Follow this link first.