FINGERPRINTS AND FYLOGENY

FELIX BREDEN BIOSBRED at UMCVMB.MISSOURI.EDU
Thu Jun 27 21:59:48 EST 1991


  - - The original note follows - -

Somebody please tell me if this gets posted.

I cut total genomic dna from guppies with HINF1 and ALU, and probed with
the repeated sequences (GACA)4, one of the repeated sequences associated
with sex chromosome of the heterogametic sex in higher vertebrates.
Obtained RFLP patterns that are highly polymorphic, up to 30 bands for
these populations, 16-20 per individual.
I want to use this info for phylogenetic reconstruction. Using band
sharing as a distance measure, build a phenogram, or maybe use presence
of a band as a character and do a cladistic analysis.
Aware of Lynch's 85 criticism of (1) nonlinearity of relatedness
measures based on fingerprints and (2) high variance around estimate of
relatedness.
Regarding (2), given large number of bands, and ability to survey large
number of offspring from lab matings within each population to eliminate
comigrating bands, should be able to reduce variance.  regarding (1),
many phenotypes used to produce distance measures are probably not
linear, so that shouldnt totally invalidate band-sharing data, and Lynch
agrees that bandsharing should give rankorder relatedness, so why
shouldnt it work in a cladistic analysis?
Grant has to go in Monday, so any thoughts greatly appreciated.
Felix Breden



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