What is the common difference in the following arithmetic sequence?

In an arithmetic sequence, any two consecutive terms have a common difference (d) while, in geometric sequence, any two consecutive terms have a constant quotient (r). In an arithmetic sequence, the variation of the terms is linear, i.e. a straight line can be drawn passing through all the points.

a reflection across the x-axis , followed by the by a reflection across the y-axis , and then a scale dilation of 0.5 .

homozygous. one is homozygous, while two is heterozygous.