What type of traits are considered polygenic traits?

1) traits affected by interactions among many genes
2) traits with multiple effects caused by a single gene
3) traits with more than two alleles in a population
4) traits showing a blending of two phenotypes

Traits affected by interactions among many genes

Explanation:

Characteristics that are polygenic are controlled by two or more major genes. The physical expression of these genes is not influenced significantly by environmental conditions. Polygenic traits are a type of discontinuous variation.

≅200-130 milions years ago pangea splited in 2 continents

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.