What would most likely cause two parents without any symptoms of a genetic disorder to have children who express the condition? pick one

1 Epigenetic modification causes the children to express dominant alleles for the condition

2 Both parents pass on a recessive allele on to the children

3 Codominant alleles cause the children to express the disease and healthy alleles

4 The parents must have had some symptoms but were not recognized due to being significantly less severe than in the children

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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.