Y-DNA fitness marker , what is it?

zanipolo

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Ethnic group
Down Under
Y-DNA haplogroup
T1a2 - Z19945
mtDNA haplogroup
K1a4o
I have a no knowledge on what a fitness marker is for Y-dna

When I was given my y-dna it stated T1b 100%, it then said I had yda Q (L245) and then J2a1b (m67).

I understand that I am 100% T y-dna but these other "fitness" indicators , are they a migrational path or do some of my DYS have similar traits to the other Y-dna's?

note- I am doing some SNP currently on my T marker

EDIT - I found info which i need to read to decide what it is for
http://www.jogg.info/11/athey.pdf
 

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