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Belyaev, D. K., A. O. Ruvinsky and P. M. Borodin. 1981.

Inheritance of alternative states of the fusion gene in mice. Journal of Heredity 72:107.

An allele, Fu, in mice causes fusion in the tail in heterozygotes, Fufu, and extremely fused and abnormal tails in the homozygotes, FuFu. From the testcross matings of

The following distribution of progeny phenotypes were observed (adapted from Belyaev et. al., 1981):

Progeny testing the nonfused mice from above revealed that 22 were genotypically Fufu.