Predict the results from the following crosses: rr x rr.
a) 50% rr: 50% rr
b) 75% rr: 25% rr
c) 100% rr

A) 50% Rr: 50% rr

The cross Rr x rr, represent a cross between a heterozygous genotype and a recessive genotype.

The offspring of the cross will be; Rr, Rr, rr, rr, which means there 50 percent Rr or heterozygous and 50 percent rr, or recessive.

The formula  for a heterozygous x homozygous recessive cross is;

Formula: Rr x rr

Offspring;

Geneotypes: 50% Rr, 50% rr, and

Phenotypes: 50% dominant trait, 50% recessive trait

it has one origin of replication, but it proceeds in two directions - d)

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

explanation: