Examples of Natural Selection

Questions

This is a key part of natural selection.

A. Phenotype

B. Genotype

C. Human

D. Antibiotics

Answer: A

What tend to increase fitness for humans living in forest that is composed of all green plants.

A. Proper sound

B. Proper skin color

C. Less Food.

D. None of this above

Answer: B

Phenotype

It looks at that humans had made some selection on themselves. If humans want to make other changes, for example in phenotype, what can they do?

Create mutation, or just reproduce with variations, or adapt to changed environments gradually.

Environment

Natural selection must work on organisms with different appearances.

All novel changes come from changes in DNA.

Climate change

DNA

Antibiotic

Different environment and climate changes may cause animal and plants to adapt.

Deoxyribonucleic acid: an extremely long macromolecule that is the main component of chromosomes and is the material that transfers genetic characteristics in all life forms, constructed of two nucleotide strands coiled around each other in a ladderlike arrangement with the sidepieces composed of alternating phosphate and deoxyribose units and the rungs composed of the purine and pyrimidine bases adenine, guanine, cytosine, and thymine: the genetic information of DNA is encoded in the sequence of the bases and is transcribed as the strands unwind and replicate.

A medicine (such as penicillin or its derivatives) that inhibits the growth of or destroys microorganisms.

Sickle Cell Anemia

Directional Selection

A genetic blood disease due to the presence of an abnormal form of hemoglobin, namely hemoglobin S. Hemoglobin is the molecule in red blood cells that transports oxygen from the lungs to the farthest areas of the body.

Fitness

Malaria

In population genetics, directional selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.

An intermittent and remittent fever caused by a protozoan parasite that invades the red blood cells. The parasite is transmitted by mosquitoes in many tropical and subtropical regions.

The genetic contribution of an individual to the next generation's gene pool relative to the average for the population, usually measured by the number of offspring or close kin that survive to reproductive age.

Donax variabilis

Pollen

Donax variabilis, common name the "coquina", is a species of small edible saltwater clam, a marine bivalve mollusc in the family Donacidae, the bean clams

Phenotype

Protein

Powdery grains that contain the male reproductive cells of most plants. In gymnosperms, pollen is produced by male cones or conelike structures. In angiosperms, pollen is produced by the anthers at the end of stamens in flowers.

The physical appearance of an organism as distinguished from its genetic makeup.

A molecule composed of polymers of amino acids joined together by peptide bonds. It can be distinguished from fats and carbohydrates by containing nitrogen. Other components include carbon, hydrogen, oxygen, sulphur, and sometimes phosphorus.

Natural Selection

Examples of Natural Selection

Evolution

Organisms better adapt to the environment

Human Impact

Environment

Human can really have huge impacts on the organisms on Earth.

Humans

Fitness

Human can make changes and do the selecting themselves.

Fitness

Can be a result of mutation

Phenotype

Mutations sometimes happen as a result of natural selection because of the change in gene will higher the fitness. Thus this will increase the population of the people with the mutation and create variation.