A Probable New Mutation to White-Belly in the House Mouse, Mus Musculus

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Abstract
Solid gray mice were crossed to white-belly blacks. The white-belly gray offspring were crossed to solid blacks. One white-belly gray F1 [male], crossed to solid black [female][female], produced only solid blacks and white-belly grays, the crossover classes. This showed that upon one chromosome he carried the gene for solid black and upon its allelomorph that for white-belly gray. The solid gray mother was probably the source of the gray. The yellow belly mutation probably occurred in a germ cell of the gray mother. It consisted either of a mutation from gray to its allelomorph white-belly gray, or if the interpretation of linked genes is correct, there was a mutation to yellow belly at a locus closely linked with gray.

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