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Biology

BILAL MEO

What is law of Dominance

Reply 1

Shivi8

Original post by BILAL MEO

What is law of Dominance

The law of dominance is the statement that when you have a pair of alleles, the dominant allele will always be expressed. So in a pair of alleles, you have two alleles. There are two types of alleles: dominant and recessive. Dominant alleles only need one allele to be expressed, whereas recessive alleles need two alleles to be expressed. For example, in the pair of alleles coding for eye colour, the dominant allele might be brown eye colour (E) and the recessive might be blue eye colour (e). For you to have a brown eye colour, you need to have either EE, Ee or eE. Because the allele for brown eye colour is dominant, you only need one allele for the trait to be expressed. For you to have a blue eye colour, you must have the pair ee. Because the allele for blue eye colour is recessive, you need both alleles for the train to be expressed. If you do not have both alleles, the dominant allele will appear instead (so you will have blue eyes). Hope this helps!