Rate of Recombination
Bradley K. Sherman
bks at s27w007.pswfs.gov
Thu Jun 13 14:28:23 EST 1996
>If we could count all the crossovers in 1000
>wild-type A.t. gametes the total would be?
> a) 0-10
> b) 10-100
> c) 100-1,000
> d) 1,000-10,000
> e) 10,000-100,000
> f) more than 100,000
The question is badly formed for two reasons:
1) the boundary between (d) & (e) is too close
to a reasonable answer.
2) I should have specified that each gamete came from
a unique individual to avoid a semantic trap of double
counting crossovers in tetrads.
But here are the answers I received in the order I received them:
(d)2500 based on 500cM/genome and 1 crossover/chromosome
per meiosis and subject to (2).
(d)2500-7500 per 1000 pollen grains based on 5-15
crossovers per PMC.
(e) based on 3 crossovers per chromosome/meiosis.
(d) based on the geographic distance in kilometers
from Berkeley to Harvard!
(d) [no explanation].
(d)1250 subject to (2).
(e)12,000 based on 600cM map and 1 crossover/50cM
Thanks for all the help,
Bradley K. Sherman | Institute of Forest Genetics
bks at s27w007.pswfs.gov | P.O. Box 245
510-559-6437 FAX:510-559-6440 | Berkeley, CA 94701 USA
<a href="http://s27w007.pswfs.gov/~bks/">Dendrome Project</a>
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