B cell is type of lymphocyte.

B cell synthesized and maturation in bone marrow.

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Lysosomal storage diseases:

• Hurler’s disease

• Inclusion-cell disease

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In the absence of ATP, the myosin head is firmly attached to the actin filament. 

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Mutation

Mutation has changed the allelic frequency.

it increases genetic variation within populations and between population.

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Genetic drift 

Genetic drift is an evolutionary force, in which allelic frequency change over generation Just by chance (sampling error). 

The deviations from the expected ratios are random, the direction of change is unpredictable.