How to distinguish linkage and crossover?

  • #1
I really dunno how to distinguish beween 2 things, it's based on the ratio right?
Thanks
 

Answers and Replies

  • #2
iansmith
Staff Emeritus
Science Advisor
Gold Member
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2
A cross-over is the exchange of segments between two homologous chromosomes of linked genes/genetic loci.

Linkage is the association of gene or genetic loci and that will likely be transmitted together during recombination/cross over.

for example you have following genetic loci:

Code:
A B C D E F G H I
a b c d e f  g h i
gene C D E and F are linked

so during recombination gene/repeats are exchange as follow

Code:
a B  c d e f G h I
[B]A[/B] b [B]C D E F[/B] g [B]H[/B] i
So when you look at the phenotype/genotype you will always see that C D E and F are always together and have the same frequency, and that the frequency of A, B, G, H, and I is indepent of each other
 

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