When I first encountered homologous genes I thought those genes are identical because the text book said so, and "homologous" meant the same knowledge.
But as I studied along, it comes out that diploid is a two sets of haploid, each from mom and dad.
This means they are not identical, doesn't it? How could they be "identical" since they are from mom and dad seperately?
If they were identical, crossing over during meiosis loses a point(mixing chromatids is meaningless if they are "same").
Then, when the text book says homologous genes are identical, what identical trait is the text book referring to?