The sentence is describing specific "cellular bodies" that contain "particles" which are genes, and are involved in the process of genetic transmission.
In biology, these cellular structures are called chromosomes, which are thread-like structures found in the nucleus of cells containing DNA and thus genes.
The second blank should describe the nature of these particles in terms of heredity — the correct term is hereditary, meaning related to genetic inheritance.
Option (A) "protoplasm, microscopic" is incorrect because protoplasm is the living content of the cell but it is not specifically associated with storing genes; also, "microscopic" is too generic.
Option (B) "globules, fat" is unrelated to genetics and refers instead to fat particles.
Option (C) "cytoplasm, minute" is incorrect because cytoplasm is the jelly-like material within a cell, not the gene-containing bodies.
Therefore, option (D) is correct as it provides scientifically precise and contextually meaningful terms.