Why is permanent immunity to the flu impossible to acquire?

1 answer:

4 0

First we must describe how immunity works. Immunity works by recognition of the antigen by macrophages or dendritic cells (antigen presenting cells) then presenting it to T cells and T cells will work to destroy the organisms with the specific antigen. B cells can also recognize antigens then secrete antibodies to combat organisms with the specific antigen. In the case of flu, or influenza, the genetic material of the virus mutates so often that the antibodies produced by the body against a certain strain of influenza will not work after some time because of the mutation of the virus.

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If a branch is cut from a tree ,after some hours the stem remains firm explain<br> ?

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resource partitioning

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Based on the scenario being described within the question it can be said that this is an example of resource partitioning. This term refers to when a species divides the limited resources in order to avoid competition within it's environment. Such as the two species of mice are doing by feeding in on the same resources at different times in order to avoid competition and conflict between each other. Thus allowing them to co-exist within the same environment.

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How many combinations of genotypes are possible for the coat coloration of rabbits which is governed by three alleles?

Dmitriy789 [7]

Answer:

b) 6

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Thus, six combinations can be formed as AA, AB, AC, BB, BC, CC.

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