20. Sickle cell anemia is a genetic disease caused by an autosomal recessive gene. If each parent carries one sickle cell
allele, what are the chances that their child will have sickle cell anemia?
one in four
two in four
three in four
no chance

List charasteristics of athenosphere

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.

Look at the inheritance patterns. what do you notice? can a single offspring inherit both chromosomes from one parent?