Which evolutionary force is initially responsible for the genetic change in the human gene pool for sickle cell anemia?

What makes a dominant allele different from a recessive allele

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

The effect of a hormone on a target cell may be decreased by the presence of