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What are the differences between directional and stabilising selection? Give an example of each.

In directional (a.k.a. adaptive) selection, one extreme of a population has a selective advantage i.e. is fitter than other individuals of the population. This causes a directional shift towards this extr...

Answered by Ben S. • Biology tutor

4004 Views

What’s the difference between mitosis and meiosis?

Mitosis is a type of cell division in which a cell divides to form two cells that are genetically identical to the original cell and each other. During the cell cycle, the cell’s amount of genetic materia...

Answered by Rebecca D. • Biology tutor

2803 Views

A student wants to study red blood cells beneath a microscope. She is not sure which solution she should use to observe such cells. In solution A, she sees figure A (plasmolysis) and in solution B she sees nothing. Can you explain her observations?

Solution A - plasmolysis. The red blood cells were in an hypertonic solution (solution had a lower water potential than the red blood cells due to increased concentration of solute) thus water molecules m...

Answered by Roxy F. • Biology tutor

2598 Views

Describe how selective breeding could be used to improve the volume of milk produced by cows.

Calculating the milk yield of mother cows and their offspring can indicate which animals have good breeding genetics. Bulls also play an important role in generating a good milk yield, and their offspring...

Answered by Saffron M. • Biology tutor

10248 Views

Describe, with the use of an example, the process of natural selection in evolution.

An example could be the peppered moth which changed its colour in order to blend into the environment as it changed with the industrial revolution.Should explain that natural selection is where advantageo...

Answered by Rose B. • Biology tutor

2639 Views