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

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.