Answer: i think its B or C
By examining the tree bark and recording it’s properties. I would note if the cells move and duplicate, I would also note any living organisms which lay on the surface
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Assuming the white phenotype is recessive. white: gg
I think the gray mouse is Gg because the offspring were pretty equally distributed in terms of color. See the punnet square below.
g g
G| Gg Gg
g| gg gg
If the Gray phenotype is recessive, then gray: ww but only if white is Ww because its about 50% chance for both.