Short sections at either end of the Y chromosome are homologous with corresponding parts of the Y chromosome. Outline why these sections are important and also need to be considered when looking at sex linkage.
Sex linkage refers to genes found on the sex chromosomes. When looking at problems associated with sex linkage, e.g. genetic diseases such as haemophilia, which occur more frequently in males as they have only one X chromosome, it is important to note the genes found on one of the sex chromosomes but not on the other. However, it is also important to look at the genes that are found on both sex chromosomes. The short sections at either end of the Y chromosome that are homologous with the corresponding parts of the X chromosome are very important as they allow the two sex chromosomes to act as an homologous pair, e.g. in meiosis in the testes.