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Home Q & A Board Biology-Related Homework Help General Biology
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sweetangel sweetangel
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12 years ago
Describe two evolutionary consequences if the process of crossing over in meiosis ceased to occur.
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#1
12 years ago
Linked alleles would remain linked forever. One really deleterious allele would spoil the whole chromosome -- it wouldn't matter if the other alleles endowed the organism with megaman abilities.
Biology!
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l2kh2000l2kh2000
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12 years ago
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#3
12 years ago
1. All linked alleles would remain linked indefinitely - no chance of them assorting independently.

Sorry, that's all I've got. Anything else would be a consequence of #1. Want to try this on for size?

2. This would limit the phenotypic diversity in a population.

Or this one?

3. A beneficial allele on the same chromosome as a deleterious allele would have essentially no chance of ever being inherited separately; natural selection would always occur on all the alleles that had to be inherited together together.
Abs
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#4
12 years ago
Once crossing over doesn't happen, genetic variation is being limited to only independent segregation, random assortment, and random fertilization. Also, without crossing over, the composition of chromosomes will never change. Therefore, I think these would be the consequences:

1. Genetic variation among individuals of future generations will be largely restricted. For say these 2 genes are linked. One bad, one good. If the bad trait results in selective disadvantage, the same risk of removal of the gene from the population is also on the good gene.

2. Being genetically similar, any bottleneck effect, for example, could potentially wipe out a lot more numbers in the population. This could pose a higher risk to extinction of the population.
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