Chromosome And Non Mammalian ( Use Drosophila As Example ) Essay examples
The paper will mainly focus on three point: how Y chromosome originated; the function of Y chromosome and the position of Y chromosome in the study of evolution.
The origin of Y chromosome
Researchers who study the mammalian Y chromosome believe that the Y chromosome arose from the X chromosome. The researchers found that there is a male-specific region on human Y chromosome which consists of several special sequence: X—transposed and X-degenerate (Skalesky et al. 2003): The X-transposed sequence is very similar to the X chromosome and the X-degenerate sequence showed that the X and Y chromosome shared a pair of autosome ancestors (Skalesky et al. 2003). The arise of Y chromosome was likely due to a mutation event that made the recombination between 2 sex chromosomes lethal, which allowed the accumulation of mutations…