The combination processes that can transform a metamorphic rock into sediment are the following;
• Exposure – this is the process where the material is being exposed in weathering conditions and it changes its appearance as time passes by.
• Weathering – this is the process in which the minerals, rocks or soil are being break down with the association of it with the earth’s atmosphere.
• Erosion – this is the action in which is where the rocks, soil or material are being removed and are being relocated into another location.
I hope you meant, a cross between BbPp and BbPp, else for bbpp x bbpp, all the progeny will be bbpp.
We need to work out a Punnett square to determine the genotypes resulting from the cross between BbPp and BbPp. The dyhybrid cross results in 16 different genotypes, of which a few have the same phenotypes.
It can be seen that there are 4 different kinds of phenotypes present, in the ratio 9:3:3:1.