In breeding pure-breeding large and small strains of mice, you cross individuals of each strain and note that their offspring are intermediate in size. two models (explanations) to account for this result are (1) that body size in these strains is due to one gene with alleles that show incomplete dominance and (2) that body size is a polygenic trait. how could you distinguish between these models? '

backcrossing

Explanation:

when you cross the offspring (inttermediate size) to one of the parental strains, (the small strain for example)  you should get 1/2 intermediate size and 1/2 parental size (small) if body size is due to  single gene. On the other hand if the trait "size" is polygenic you should get mice around half way between small and intermediate sizes.  

answer'(basidium)the spore--bearing structure of a basidiomycete is called a basidiocarp; ///

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.