gene loci

Genetics as it applies to evolution, molecular biology, and medical aspects.

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gene loci

Post by isabell » Sat May 06, 2006 4:02 pm

can someone explain me how to answer this question please??? :?
which two gene loci are the most distant on a chromosome?
1 crossover frequency of 2%
2 crossover frequency of 4%
3 crossover frequency of 8%
4 crossover frequency of 10%
5 no crossover


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Gene loci

Post by virlomi_stone » Sat May 06, 2006 8:35 pm

the % of crossover frequency is equal to map units. So, if a crossover frequency is 2% then the loci are 2 map units apart. The farther apart two loci are on a chromosome the more likely they are to exhibit crossover. No crossover could mean that the genes are on different chromosomes. So, the one with the crossover frequency of 10% are the ones that are most distant.

Hope this helps!

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Post by sdekivit » Sat May 06, 2006 8:42 pm

remember that when 2 loci on 1 chromosome are far away from each other, much recombination can occur in the region between these two loci --> a higher percentage of recombination will occur.

When the space between two loci is very small, it's hard to separate these two loci from each other so less recombination will occur.

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