It is given that the three genes are present on the same chromosome.
Out of them genes a and b are 10 cM apart so they are the farthest from each other.
Gene c can lie between them according to the conditions given in the question. It will be 8cM apart from gene a and 2cM apart from gene b making the total distance as 10cm.
A divergent plate boundary often forms a mountain chain known as a ridge. This feature forms as magma escapes into the space between the spreading tectonic plates.
