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.'
Your body can use it in a better way then just having it just sit there
The best and most correct answer among the choices provided by the question is the fourth choice. The main difference between mitosis and meiosis is that m<span>itosis produces genetically identical daughter cells. </span>I hope my answer has come to your help. God bless and have a nice day ahead!
The Sun is the ultimate source of energy for most communities of living things in a food web.
