Which of the following statements best defines epistasis? O 1. We have epistasis when interacting genes do not show independent assortment
2. We have epistasis when identical genes produce different expression patterns in the same genotype and environment
3. We have epistasis when an allele at one locus masks the effects of one or more other alleles at the same locus
4. We have epistasis when an allele at one locus modifies the effects of alleles at one or more other loci

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary