The allele for the sickle cell mutation is most common in Blank______.Multiple choice question.AmericaSouthern AfricaCentral AfricaNorthern Africa

The frequency of the sickle cell mutation among populations in Central Africa is Blank______ that found among African Americans.Multiple choice question.equal tolower thanhigher than

The sickle-cell anemia allele is maintained at relatively high frequencies in some human populations because Blank______.Multiple choice question.the beta-globin gene mutates very frequently in those populationsheterozygotes for the disease allele are resistant to malariathe beta-globin gene is not subject to natural selection

Different alleles of genes are found within different individuals of a population. This is known as Blank______,Multiple choice question.genetic driftgenetic variationnatural selection

In Sickle-Cell disease is caused by a mutation in a gene that codes for one of the protein's subunits. Which one of the following statements about this disease is correct?Group of answer choicesThe mutation is due to a silent mutation within the alpha subunit that changes an electrically charged amino acid to another electrically charged amino acid.acid.The mutation is due to a missense mutation within the beta subunit that changes an electrically charged amino acid to a nonpolar amino acid.The mutation is due to a missense mutation within the alpha subunit that changes an electrically charged amino acid to a nonpolar amino acid.The mutation is due to a silent mutation within the beta subunit that changes an electrically charged amino acid to another electrically charged amino.

In humans, the sickle-cell trait is caused by a single defective allele, but sickle-cell disease only occurs in individuals that are homozygous for the sickle-cell allele. A man and woman each carry the trait, but do not have sickle-cell disease. What is the probability that their first two children will both have sickle-cell disease?Multiple Choice1/23/81/41/81/16