The medical term that means berry-shaped bacteria in twisted chains is:

berry-shaped bacteria in twisted chains are called streptococcus. streptococcus is a genus of gram-positive coccus or spherical bacteria. streptococci bacteria divide along a single axis, so as they grow they tend to form pairs or chains that may appear bent or twisted. whereas staphylococci, which divide along multiple axes, thereby forming irregular grape-like clusters of cells.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.