heritability of Z-linked trait

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Tweedy
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heritability of Z-linked trait

Post by Tweedy » Thu Jul 09, 2009 7:50 am

In birds, with WZ (males) / ZZ (females) sex chromosomes, I want calculate the following heritabilities by means of both these regressions:

1. Paternal grandfather- male grandoffspring regression
2. Maternal grandfather- male grandoffspring regression

For traits codified by genes located in the autosomes, I know that I would have to multiply the regression coefficients by 4 in each one of both regressions.

But, were the traits I am interested be located in the Z chromosome, What would be the coefficients to apply to the regression coefficients (b) obtained in each case?...Males always have one of the maternal grandfather Z chromosomes but the likelihood of having a Z chromosome derived from the paternal grandfather is 0.5.

Thanks!

Darby
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Post by Darby » Thu Jul 09, 2009 6:55 pm

Aren't the unmatched chromosomes female in birds?

Tweedy
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Re:

Post by Tweedy » Fri Jul 10, 2009 12:36 pm

Darby wrote:Aren't the unmatched chromosomes female in birds?


In birds, and lepidoptera, among others, females are the heterogametic sex (assuming "unmatched" means XY or ZW)

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