Which of the following is likely to be the result of polygenic inheritance? a. freckles
b. an extra finger
c. human height
d. ABO blood type

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

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.

Explain what is meant by a river’s load, and describe how the load is carried.