An artery carrying blood to Derrick's brain has become blocked and caused some brain tissue to die. Derrick has suffered

Which of the following represents regression on the part of a child when a sibling is born?

a. Wanting to help mommy take care of the new baby b. An older child having toilet accidents, even after having been potty trained c. A younger sibling attempting to imitate an older sibling d. Refusing to spend any time with the new child.

Your sister-in-law frequently comments on how many traits you seem to have in common with your eight-year-old niece. You share your extensive knowledge on genetics and explain that the chance you share an allele with your niece is ____

a. one sixteenth b. one eighth c. one fourth d. one half