The Liberal Party in England, which has the current British governmental majority, is seeing some Catholic MPs rebelling over the Human Fertilisation and Embryology bill. The measure would promote the kind of cloning practices Catholics oppose and some top government officials could vote no even if the Party doesn't allow a free vote.
Three British cabinet ministers could defy an instruction from their party to support the measure, including Ruth Kelly, Des Browne and Paul Murphy.
Andy Burnham, the Culture Secretary, is also said to have raised objections.
The bill allows the creation of clones that are 99 percent human but also have animal DNA infused. Scientists want to clone and kill these chimeras to search for cures for diseases.