In snails that live in the fictional town of Bikini Bottom, the coloring of their shells is determined by different alleles at two loci, (C, c and D, d). There are four possible shell patterns-polka dotted, striped, solid, and swirly. The polka dotted shape results from C_D_genotype. Striped shells are produced from C_dd. Solid coloured shells are produced from ccD_. Swirly shells are produced from ccdd. For each of the following crosses, determine the phenotypic ratios that are expected from each cross. ( 2 marks each)

A. ×cc
B. c×c
C. CcDd x ccdd
D. CCdd x CcDD