You are researching techniques that use karyotypes to predict the possibility of a child being born with Down syndrome. Which would be
the most useful-a complete karyotype of a non-reproductive cell
taken from the father, the mother, or a cell from the unborn child
through the testing of amniotic fluid? Use your knowledge of the
causes of Down syndrome to explain your reasoning.

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.