Some elements exist naturally as molecules. For example, hydrogen and oxygen exist as two-atom molecules.

TLS Online TPP Program

#Id: 9195

#Section 3: Genetics, Cellular and Molecular Biology

Type of natural selection

1. Stabilized natural selection

2. Directional Natural selection

3. Disruptive Natural selection

4. Balance natural selection

TLS Online TPP Program

#Id: 9196

#Section 3: Genetics, Cellular and Molecular Biology

TLS Online TPP Program

#Id: 9197

#Section 3: Genetics, Cellular and Molecular Biology

Stabilized natural selection

Favor intermediate phenotype but eliminate lower and higher-grade phenotype

It introduced homogeneity in the population

Exp - clutch size of birds that lay too many or too few eggs per nest have lower fitness values than do those that lay an intermediate number of eggs

TLS Online TPP Program

#Id: 9198

#Section 3: Genetics, Cellular and Molecular Biology

TLS Online TPP Program

#Id: 9199

#Section 3: Genetics, Cellular and Molecular Biology

Directional Natural selection

Directional selection favors individuals at one extreme of a phenotypic distribution that have greater reproductive success in a particular environment.

TLS Online TPP Program

#Id: 9200

#Section 3: Genetics, Cellular and Molecular Biology

1. Resistant to pesticide in insect

2. Antibiotic resistant in pathogen

3. Industrial melanism