If there are 80 individuals in the f2 generation of a dihybrid cross involving duplicate genes, what would be the expected number of the dominant phenotype?

The correct answer is 45.

A dihybrid cross is a mating experiment between two organisms that are identically hybrid for two traits.

In F1 generation all of the offspring will be heterozygous. In F2 generation the phenotype ratio will be 9:3:3:1. 9 represents the ratio for dominant phenotype.

If there is 80 individuals than:

80/(9+3+3+1)=5

5*9=45

solvent

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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.