Rocks are identified primarily by the minerals they contain and by their texture. Each type of rock has a distinctive set of minerals. A rock may be made of grains of all one mineral type, such as quartzite. Much more commonly, rocks are made of a mixture of different minerals. Texture is a description of the size, shape, and arrangement of mineral grains. Are the two samples in figure 2 the same rock type? Do they have the same minerals? The same texture?
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Balanced polymorphism implies that not the entire population of African Americans are heterozygous for the sickle cell trait.
It is worthy to note that immunity from malaria isn't derived or given to an individual by genes. African Americans do have an higher tendency to show thalassemia, which can't offer immunity to an individual totally from the symptoms malaria.
This case study is an example of Natural selection in humans and unusual hemoglobins and immunity to malaria. The heterozygous persons for the sickle cell gene stands at an higher probability of overpowering or not showing the symptoms of malaria than both classes of homozygous persons.
This implies that for either alleles-the sickling allele and the normal allele-are kept at a relatively constant frequency, implying to the heterozygote possessing a kind of balanced polymorphism. As the homozygous individuals do not show immunity against malaria, it is not justifiable and inadequate to establish a blanket statement that all African Americans are protected from malaria.
The overall function of the digestive system as digestion and absorption of food stuffs, and the general activities of each digestive system organ is; Ingest, digest, absorb, defecate.
Ingestion involves placing food into the mouth, propulsion involves propelling food from one organ to the next using peristalsis. Mechanical digestion involves the physical fragmenting food into smaller particles. Chemical digestion refers to breaking down food molecules to building blocks by enzymes. Absorption is the transport of digested end products to blood or lymph; and finally Defecation which involves the elimination of indigestable material from GI tract by anus.
