This refers to gene variants that are inherited together because they sit next to each other on a chromosome. Suppose a mutation that greatly increases the mutation rate somehow ends up next to a new mutation that greatly increases fitness 各位兄弟姐妹，红色部分该如何翻译，以使意思明确，上下文通顺？
In theory, a mutation catastrophe can also occur as a result of linkage. This refers to gene variants that are inherited together because they sit next to each other on a chromosome. Suppose a mutation that greatly increases the mutation rate somehow ends up next to a new mutation that greatly increases fitness. The immediate fitness benefits of the beneficial mutation will initially mask the deleterious effects of the "mutator" mutation, meaning both mutations will rapidly sweep through a population, ultimately with disastrous consequences.
一篇讨论进化论的文章，fitness 出自“survival of fittest”优胜劣汰，适者生存。 该文章大意讲述的是，基因突变可以向好的方向，也自然会向坏的方向。而这段的前后就是讨论基因突变引发的物种灭绝的情况。
douyue (05/17/2008)
This refers to gene variants that are inherited together because they sit next to each other on a chromosome. Suppose a mutation that greatly increases the mutation rate somehow ends up next to a new mutation that greatly increases fitness
各位兄弟姐妹，红色部分该如何翻译，以使意思明确，上下文通顺？
陈奕丰 (05/17/2008)
这是指由于在染色体上处于相邻座位而被共同遗传的不同基因. 假设一个极大增加了基因突变率的基因突变在某种情况下, 结果同一个极大增加了适合度的新基因突变处于了相邻的座位.
jozy (05/19/2008)
In theory, a mutation catastrophe can also occur as a result of linkage. This refers to gene variants that are inherited together because they sit next to each other on a chromosome. Suppose a mutation that greatly increases the mutation rate somehow ends up next to a new mutation that greatly increases fitness. The immediate fitness benefits of the beneficial mutation will initially mask the deleterious effects of the "mutator" mutation, meaning both mutations will rapidly sweep through a population, ultimately with disastrous consequences.
一篇讨论进化论的文章，fitness 出自“survival of fittest”优胜劣汰，适者生存。
该文章大意讲述的是，基因突变可以向好的方向，也自然会向坏的方向。而这段的前后就是讨论基因突变引发的物种灭绝的情况。
“在理论上，基因间联系也可以导致灾难性的后果。这是指由于在染色体上，基因是一个挨一个排列的。假如一个会极大增加基因突变机率的基因突变由于某种原因正好位于一个有很强适应性（易被传播）的基因旁边。那么这种显性的“适应性”将在一定程度上掩盖了这个“突变”的基因突变的有害的影响。这就意味着，两个基因突变将一起在该物种中快速传播，并最终导致灾难性的后果。”
douyue (05/19/2008)
谢谢二位的解释和帮助！---douyue