Abstract
The breeding data on Zucker rats and on Koletsky rats confirm that the obesity in these two strains of rats is inherited recessively and results from single gene mutations. Mating a Zucker heterozygote to a Koletsky heterozygote produced obese F1 progeny. Inter-stock breeding results indicate that the obesity in the Zucker-Koletsky hybrid stock is also inherited in a recessive manner. The gene that controls obesity in the Zucker rats, fatty (fa), and the gene that controls obesity in the Koletsky rats, f, are thus alleles at the same locus. We propose that f be renamed fak until it can be proven that fa and fak are identical.
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