, define “weathering”

Weathering is the breaking down of rocks,soil,and minerals as well as wood and artificial materials through contact with the earth atmosphere,water and biological organisms.

Explanation:

Weathering causes the disintegration of rock near the surface of the earth. ... Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice. There are two types of weathering: mechanical and chemical.

It is expected to observe individuals exhibiting green, yellow, blue, and white colors in a phenotypic ratio of 9:3:3:1, respectively.

Explanation:

This example is a classic case of a dihybrid cross involving two unlinked genes that differ in the same observed trait. In this case, the genotype double homozygous recessive is white, while the presence of one dominant allele in one of these genes results in individuals with either blue or yellow color. Finally, the presence of two dominant alleles results in individuals with blue color.

Phenotypic and genotypic ratios:

gene 1 two alleles U u

gene 2 two alleles N n

Cross:  

UuNn x UuNn

uunn: white color (1/16)

U_nn: yellow color (3/16)

uuN_: blue color (3/16)

U_N_: green color (9/16)