Genetical and embryological comparison of two mutations which cause foetal blebs in mice

SUMMARY Mutants with abnormalities which were the consequence of the formation of haematomas during gestation were designated as ‘foetal haematomata’ ( fh ). The fh homozygotes were found to be morphologically and embryologically very similar to myelencephalic bleb ( my ) mice. It was also found, however, that the fh and my mutants were separate genetic entities due to two independently segregating recessive genes.