biology

[xDent09]

Probability of a cross over occuring between two homologous chromosomes is increased if they are Further or Closer together, WHY?

---

Members don't see this ad.

 

[Orgodox]

If two loci of one chromosome are in vicinity, then the probability that they are separated by a crossing over is low. It increases with growing distance.

 

[letsgfuad]

if there is more space between the two genes, then there is a greater chance for their to be a recombination event. If they are very close, its less likely that there will be such an event.

 

[klutzy1987]

If two loci of one chromosome are in vicinity, then the probability that they are separated by a crossing over is low. It increases with growing distance.

Why is that. What is the logic behind the probability of crossing over should increase with distance???

 

[TheWiredNerv]

Why is that. What is the logic behind the probability of crossing over should increase with distance???

The closer two genes are, the more likely they are linked and won't be involved in crossing over.

 

[therealsquat]

.

 

[Orgodox]

Hey guys sorry wanted to post earlier but was studying for genetics midterm. It was funny kept reading bout this again but wanted to finish the chapters first.
So like weirdnrv and realsquat said and I mentioned earlier if the genes are close together then they are more likely travel together.

Clutzy heres the logic: When crossing over takes place, if genes are far apart one may experience crossing over but another thats far away on the chromosome might not experience this. If however two genes are very close (the extreme example they are linked and ONLY travel together) then even when one experiences crossing over the other will go with it. Crossing over results in recombination ie it breaks up the association of genes that are on the same chromosome. So if 2 traits are completely linked they can only be inherited together and the crosses will only produce nonrecombinant progeny.
Would you like a specific example?