<span>Without variation, there is no difference between members of a population to be "selected for" in the first place. This is a basic tenet of natural selection. A new trait must arise in order to advance or decrease the fitness of the individual, and hence, its ability to pass on its genes.</span>
Answer:
These pertain to characteristics of an Eukaryotic cell
Explanation:
- Nucleic acids
- Nucleolus
- Rough endoplasmic reticulum
- Smooth endoplasmid reticulum
- Golgi apparatus
- Vesicle
- Mitochondria
- Lysosomes
- Peroxisomes
- Nucleoporin
- Cytoskeleton
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A patient with sickle cell crisis will most likely complain of severe pain.
A patient with sickle cell disease have an abnormal amino acid composition of hemoglobin, leading to a comformational change to insoluble proteins whenever the red blood cell is deoxygenated; this leads to a change in shape from biconcave to sickle shaped. In sickle cell crisis, the abnormal RBC clump together (easily, because of their shape) then obstruct small blood vessels in the extremities and other organs, causing severe pain.