Heterozygotes are therefore more resistant to the debilitating effects of malaria than the normal homozygotes. This heterozygote advantage in many sickle-cell carriers outweighs the severe reproductive disadvantage of the rarer sickle-cell homozygotes.
Sickle cell anemia is caused by a point mutation in the hemoglobin-beta gene (GAG --> GTG). The mutation causes the missense mutation in the hemoglobin-beta protein associated with the substitution...
Food preservation is achieved by three main methods as inactivation of microorganisms and/or enzymes, inhibition of microbial growth or deterioration of quality and avoidance of recontamination of food at all...
People with one sickle cell allele are not likely to get malaria. What is this an example of?This is an example of an overdominancy and natural selection. One sickle cell...
When they lose their oxygen, they form into the shape of a sickle or crescent, like the letter C. These cells stick together and can't easily move through the blood...
Natural selection can maintain balanced polymorphisms. A balanced polymorphism is one in which two or more phenotypes are maintained in fairly stable proportions over many generations. Natural selection preserves balanced...
The dominant allele A encodes for the enzyme required for the production of red anthocyanin, which is stored in the vacuole of the plant petal cells. The recessive allele a...
Mutation,Gene flow, Genetic drift, and Natural selection.Mutationit creates a new DNA sequence for a particular gene, creating a new allele. Recombination also can create a new DNA sequence (a new...
