People with one copy of the allele that causes sickle cell anemia are called , while people with two copies of the allele have the disease.

Asap i will reward you brainliest for best which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Which is one example of a phenotypic change that is not genetic