When we are talking of dominance in genes, we have that a gene can present with certain variations, this variations are called alleles. Now acording to mendelian genetics in alleles we can have dominant alleles or recessive alleles.
When an allele is dominant it means thet every time this allele be present the trait thet code will show, it doesn't matter if the organism is homozygous (SS for example) or heterozygous (Ss for example) in both cases the person wil have smile dimples, now a recessive trait will only show itself when is in its homozygous form (ss) and in that case and only the person won't show smile dimples.
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Answer:
Citrus greening disease
Explanation:
The symptoms sound like citrus greening disease. This disease is characterised by yellowing of the veins in the leaves, splotchy mottling of the entire leaf, leaves that fall off too early, and fruit that can turn green and tastes bitter.
Citrus greening disease is caused by a bacteria, and transferred by insects such as the Diaphorina citri.
Answer:
When blood glucose level rises beyond the threshold levels, the pancreas secrets hormones insulin. The latter ensures entry of glucose into the cells through Glut transporters for cellular utilization, therefore reducing the blood levels., and promotes storage as glycogen in the liver and muscles.
How ever if the glucose levels drops below the set point, an hormone glucagon is also produce by the pancreas to cause the liver o withdrawal and breakdown glucose storage as glycogen back to glucose thus raising the blood glucose level back to the normal levels.
This is an example of negative feedback mechanism, because the increase in the input levels (blood glucose levels) brings about a counter mechanisms (insulin secretions)as output , to reduce the elevated levels by promoting entry into the cells,, thus bringing the levels to threshold levels.
Thus insulin is acting in a negative feedback mechanism to control blood glucose levels
Explanation:
If a chromatographic column is not placed in a vertical position, the flow and the separation rate of the materials which are been separated may be negatively affected, that is, it may be slowed down, this is because the column is not inclined in the same direction as the flow of the separating substances. Also, collecting the products of the separation will be a bit difficult. If the column is placed in a vertical position, then a test tube can be placed at the end of the column for collecting the separated product