QUESTION: Select the correct answer.
Sickle cell disease is a hereditary mutation that causes the red blood cells to deform, decreasing their ability to carry oxygen. Based on the image, what kind of mutation occurs to cause sickle cell disease?

ANSWER OPTIONS
deletion
duplication
substitution
translocation

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos