The process of diffusion and active transport are both used to move molecules from high to low concentration
The answer is protect the body from infection by pathogens
The physical barrier is made of epithelial cells, mostly will be keratinized to increase their sturdiness further. They will impede the pathogen physically by barricading the cells, makes the pathogen could not invade deeper part of the body. Histamine and antibodies should be the role of immune cells, not epithelial.
Variations in a genotype could be major or minor. It really depends on the degree of change. A genotype changes due to errors mutations. Some are endogenous, occuring with the organismm often during meiosis that causes changes in a genotype.
Learn more about here: https://www.quora.com/What-causes-variation-in-genotypes-How-does-this-occur
Answer:
There are two types of endoplasmic reticulum: rough endoplasmic reticulum (rough ER) and smooth endoplasmic reticulum (smooth ER). Both types are present in plant and animal cells. The two types of ER often appear as if separate, but they are sub-compartments of the same organelle.
Explanation:
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Answer and Explanation:
Sickle cell anemia is a disease of humans which is inherited in an incomplete dominance way. The disease is transmitted through a recessive gene that leads to the synthesis of abnormal haemoglobin. The disease treatment can be administered through gene therapy which is the replacement of faulty genes with normal ones aimed at correcting genetic disorders. Bone marrow transplant can also be done to replace the defect cells that produce sickle celled red blood cells.
