Early balding is a sex-linked recessive disorder. What is the phenotypic ratio
of an affected female mating with an
unaffected male?

a. 2 XNXn: 2 XnY
b. 2 Carrier female: 2 affected male
c. 2 Unaffected female: 2 affected male
d. 2 XNXN: 2XnY

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.

Explain how organisms could be harmed by high levels of salt from roadways?