As an Amazon Associate I earn from qualifying purchases.

Directional selection Definition and Explanation PDF | Download eBooks

Learn Directional selection definition in biology with explanation to study “What is Directional selection”. Study directional selection explanation with biology terms to review biology course for online degree programs.

Directional selection Definition:

  • Directional selection occurs when conditions favor individuals exhibiting one extreme of a phenotypic range, thereby shifting a population's frequency curve for the phenotypic character in one direction or the other.

    Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson

Directional selection Explanation:

Directional selection is common when a population's environment changes or when members of a population migrate to a new (and different) habitat. For instance, an increase in the relative abundance of large seeds over small seeds can lead to an increase in beak depth in a population of Galapagos finches. SO in this way external environmental factors may contribute towards the selection of a phenotype.

Keep Learning Biology Explanations

What is piRNA?

Piwi-interacting RNA (piRNA) is the largest class of small non-coding RNA molecules that are expressed in animal cells. Just like ...

What is Bioremediation?

Bioremediation is a process used to treat contaminated media, including water, soil and subsurface material, by altering environmental conditions to ...

What are C4 plants?

A C4 plant is a plant that cycles carbon dioxide into four-carbon sugar compounds to enter into the Calvin cycle, ...

What is Zygote?

A zygote is a cell, eukaryotic, that is formed by a fertilization event between two gametes. The zygote's genome is ...

What is Starch?

Starch is a complex carbon found in several plants and is made of multiple glucose monomers joined together with α ...

What is Chromatin?

Chromatin is a complex of DNA and histone proteins. Chromatin is actually what formed the chromosomes within the nucleus of ...