Sir John Bertrand Gurdon further developed nuclear transplantation, the technique used to clone organisms and to create stem cells, while working in Britain in the second half of the twentieth century. Gurdon's research built on the work of Thomas King and Robert Briggs in the United States, who in 1952 published findings that indicated that scientists could take a nucleus from an early embryonic cell and successfully transfer it into an unfertilized and enucleated egg cell. Briggs and King also concluded that a nucleus taken from an adult cell and similarly inserted into an unfertilized enucleated egg cell could not produce normal development. In 1962, however, Gurdon published results that indicated otherwise. While Briggs and King worked with Rana pipiens frogs, Gurdon used the faster-growing species Xenopus laevis to show that nuclei from specialized cells still held the potential to be any cell despite its specialization. In 2012, the Nobel Prize Committee awarded Gurdon and Shinya Yamanaka its prize in physiology and medicine for for their work on cloning and pluripotent stem cells.

Theodor Boveri investigated the mechanisms of heredity. He developed the chromosomal theory of inheritance and the idea of chromosomal individuality. Boveri sought to provide a comprehensive explanation for the hereditary role and behavior of chromosomes. He hoped that his experiments would also help to distinguish the roles of the nucleus and the cytoplasm in embryogenesis. Boveri was particularly interested in how offspring are shaped by the attributes of their parents. His exhaustive studies of chromosomal and cellular behavior during early development paved the way for much of the emerging field of embryology.

British embryologist Sir Ian Wilmut, best known for his work in the field of animal genetic engineering and the successful cloning of sheep, was born 7 July 1944 in Hampton Lucy, England. The family later moved to Scarborough, in the north of the country, to allow his father to accept a teaching position. There Wilmut met Gordon Whalley, head of the biology department at Scarborough High School for Boys, which Wilmut attended. Under Whalley's influence, young Wilmut first expressed interest in the life sciences and after graduating high school, he enrolled in the University of Nottingham to study agriculture. It was during his freshman year at Nottingham that Wilmut first came into contact with scientific research. He was mentored by Professor Eric Lamming, an expert in reproductive science and animal physiology, who sparked Wilmut's curiosity with animal genetics. Wilmut 's father, Leonard Wilmut, had diabetes, which eventually brought about blindness and may have been another, more personal factor that stimulated Wilmut's interest in the field. The summer before his graduation from Nottingham, Wilmut completed an eight-week internship at Cambridge in the laboratory of Christopher Polge, a prominent cryobiologist. There, he was introduced to techniques of preserving and manipulating animal cells.