"chloe’s mother wants to have another child. however, she is concerned that a second child might also have cf, so she encourages chloe’s stepfather to be tested. tests reveal that he does not carry the cf gene. what is the chance that a second child born to chloe’s mother and stepfather will have cf? "

0%

Explanation:

The cystic fibrosis transmembrane conductance regulator (CFTR) protein is responsible for cystic fibrosis. It is transmitted in a autosomal recessive manner. This means that both parents must have the CF gene in order for the development of CF in the child.

Here, Chloe's father and mother both had the CF gene so Chloe developed CF. However, Chloe's stepfather does not have the CF gene hence a child with the step father will not have CF.

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.