Answer:
Sarcoplasmic Reticulum
Explanation:
Sarcoplasmic Reticulum (in muscle cells) is a modified form of Endoplasmic Reticulum located in other cells. Its primary function is to store and regulate the movement of intracellular Calcium ions during muscle contraction.
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Alleles are different forms of the same gene that are always found on the same position of two homologous chromosomes. This means your answer is going to be option A.
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Magnetic Field.
Magnetism is a force that can act at a distance. However magnets cannot exert a force on an object that is too far away.