One general effect of overuse of an environmental resource is the destruction of the ecosystem. Overuse of natural resources usually throw the ecosystem out of balance and disrupts the life of the living organisms which are living in that particular location.<span />
Its so simple. Two alleles means three genotypes.
consider a gene has two alleles A(blue eyes) and a(brown eyes)
possible combinations:
1. AA - Homozygous dominant -Blue eyes.
2. Aa - Heterozygous - Blue eyes.
3. aa - Homozygous recessive - Brown eyes.
