Ans.
Sickle-cell disorder shows defected red blood cells, due to mutation in gene that code for hemoglobin. The mutated genes for sickle-cell disease are found in higher percentage of sub-Saharan African population as it provides protection against malaria as compared to population of United States.
Malaria is common in sub-Saharan Africa region and there, natural selection favored gene for sickle cells, because it might be beneficial to people having sickle cell disease that makes them able to survive in such condition and transmit their genes to offspring.
On the other hand, in those Africans, who moved to United States, where malaria is uncommon or absent, natural selection favored normal, wild type genes, resulting in fewer people with defected sickle cell.
Thus, the evolutionary process behind this is 'natural selection.'
The recessive trait in the F1 plants appears in a ratio of 3:1.
The lack of detail and scaling makes the Appalachian trail map useless. An evidence coming from the story is it has a scale of 1:100,000 which compresses the places, the routes, trails of the real world into a mere centimeter in the map.
Oxygen and glucose are two outputs in the process of cellular respiration<span>.</span>
Animal bones contains minerals and so simmering them is generally believed to produce a broth that also contains minerals. Studies have demonstrated that calcium and magnesium levels in broth are generally related to cooking. but little is believed about the extraction of other elements, including toxic metals in broth.
