Examine the Punnett square below, which represents a dihybrid cross of two rose bushes.
RT Rt rT rt
RT RRTT RRTt RrTT RrTt
Rt RRTt RRtt RrTt Rrtt
rT RrTT RrTt rrTT rrTt
rt RrTt Rrtt rrTt rrtt
How many different genotype variations are possible in the offspring of these crossed rose bushes?