Which is true regarding all x-linked disorders?

they result in a longer lifespan

they are caused by mutations of the x chromosome

they are linked to an unknown chromosome

they are disorders that affect only women

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?

Identify the structures ! 20 points

As a result of climate change earths temperature is rising and sea ice is melting what is a likely effect? answer : populations of walruses and polar bears will decline