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EVOLUTION CONNECTIONCrossing over is thought to be evolutionarily advantageousbecause it
Chapter 15, Problem 11(choose chapter or problem)
EVOLUTION CONNECTIONCrossing over is thought to be evolutionarily advantageousbecause it continually shuffles genetic alleles into novelcombinations. Until recently, it was thought that the geneson the Y chromosome might degenerate because they lackhomologous genes on the X chromosome with which to pairup prior to crossing over. However, when the Y chromosomewas sequenced, eight large regions were found to be internallyhomologous to each other, and quite a few of the 78 genes representduplicates. (Y chromosome researcher David Page hascalled it a hall of mirrors.) What might be a benefit of theseregions?
Questions & Answers
QUESTION:
EVOLUTION CONNECTIONCrossing over is thought to be evolutionarily advantageousbecause it continually shuffles genetic alleles into novelcombinations. Until recently, it was thought that the geneson the Y chromosome might degenerate because they lackhomologous genes on the X chromosome with which to pairup prior to crossing over. However, when the Y chromosomewas sequenced, eight large regions were found to be internallyhomologous to each other, and quite a few of the 78 genes representduplicates. (Y chromosome researcher David Page hascalled it a hall of mirrors.) What might be a benefit of theseregions?
ANSWER:The benefit of these homologous regions on the Y chromosome is that they to can “cross over” with each other. This exchange results in increased diversity of genetic material, which can then potentially be benef