If one individual in 1,000,000 has a genetic disease caused by a recessive Mendelian allele, roughly what fraction of individuals in a randomly mating population are heterozygous carriers of this disease allele.

2,000,000

Explanation:

Normal Mendellian genetics uses the law of independent assortment and law of segregation. The law of independent assortment: This means that there is a fair chance of either or allele to be passed on with the same frequency. Then law of independent assortment:  Different alleles of different traits will segregate independently of each other and are not linked to the other.

Assuming that the disease is not fatal in anyway. If the gene is recessive this means that there must be two alleles present this means the one or both parents must have this allele. In this case a random sampling of the population should be twice the number of those that have the trait assuming the segregation is 1:2:1 for normal, heterozygous, mutation therefore the answer is 2 million

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.