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Bezzdna [24]
3 years ago
14

Which is the best definition for directional selection

Biology
2 answers:
kotegsom [21]3 years ago
6 0
It is a mode of natural selection where an extreme phenotype is favored by the other phenotypes  causing the allele frequency to  shift over time in the direction of that phenotype
postnew [5]3 years ago
3 0

Answer:B- a process by which one of the extreme variations of a trait is favored.

Explanation:

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Using the idea of concentration gradient explain why the purple colour of potassium permaganate gradually spreads throughout the
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The purple color of potassium permanganate gradually spreads throughout the water in the jar by the process of diffusion.

  • Diffusion is the process of movement of a substance from the region of higher concentration to the regions of lower concentration. Diffusion occurs in liquids as well as gases.
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  • The concentration of potassium permanganate is higher at one point and the other regions in the jar have its nil or low concentrations initially, this leads to the set up of a concentration gradient.
  • As time passes diffusion occurs and the particles of potassium permanganate keep on migrating to the regions of low concentration until the concentration is uniform throughout the jar. Ultimately, it spread throughout the jar making the water purple.

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Study the diagram shown.
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