chiasmata
When chromosomes crossover the x shaped region created is called a chiasmata. These chiasmatas allow chromosomes to exchange of genetic materials.
The pair of chromosomes that doesn't typically undergo crossover or recombination is the sex chromosomes in many organisms, particularly in humans, where the X and Y chromosomes are involved. During male meiosis, the X and Y chromosomes can pair but often do not exchange genetic material, especially in regions called the pseudoautosomal regions (PARs). This lack of recombination helps maintain the distinct characteristics of the sex chromosomes across generations.
Genes are located on chromosomes. Genes are simply regions on chromosomes that code for polypeptides.
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