The group in an experiment that all the conditions stay the same is the control group.
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.
<span>It happens through allopatric speciation. Hope this helps :)</span>
The mandible of a crayfish is used to grind food. The maxillae holds,tears, and passes the solid food to the mouth. What structures are used for capturing prey or securing and. eating food. The mandible of a crayfish is used to grind food