Genetic mapping

[pensive]

Hello everyone

 

 

I was wondering something. During our lectures I have learned about the concept of genetic mapping but now really how it is achieved.

 

In outline, how is such a thing done in diploid and haploid organism.

 

I'm assuming that in haploids, maybe someone sort of test cross is done where a known homozygote and heterozygote (if that is possible to have in haploid) are crossed and the progeny are observed.

 

But, I'm not 100% sure how a diploid would be crossed. I did try looking around but didn't get a straight answers. Obviously, there would be a known homo and hetrozygote again. But the procedure I don't know.

 

 

Cheers guys for the useful information!

[CharonY]

I would need a bit more context to your question. Where examples given? The reason is that there are a lot of approaches (many now kind of obsolete), ranging from molecular biological techniques to crossing (or conjugation,in bacteria) and looking for phenotypes. The latter is hardly done anymore, though.

[pensive]

I would need a bit more context to your question. Where examples given? The reason is that there are a lot of approaches (many now kind of obsolete), ranging from molecular biological techniques to crossing (or conjugation,in bacteria) and looking for phenotypes. The latter is hardly done anymore, though.

 

The context we were given for haploid was a fungus called Aspergillus nidulans but I think that it has a diploid phase as well.

 

Crossing technique would be helped if explained!

Edited March 25, 2012 by pensive