John Tyler
John Tyler
John Tylerwas the tenth President of the United States. He was also, briefly, the tenth vice president, elected to that office on the 1840 Whig ticket with William Henry Harrison. Tyler became president after Harrison's death in April 1841, only a month after the start of the new administration. Known to that point as a supporter of states' rights, which endeared him to his fellow Virginians, his actions as president showed that he was willing to back nationalist policies as...
NationalityAmerican
ProfessionPresident
Date of Birth29 March 1790
CountryUnited States of America
John Tyler quotes about
There are good reasons why natural selection has become widely accepted as an explanation of evolutionary development. When applied to mammals and other large animals, it fits perfectly. But we cannot assume that all evolutionary steps arise from selection, particularly when looking at smaller animals.
When, as an undergraduate, I began experiments on these slime molds in 1940, only one other person, Kenneth Raper, was working on them at that time. In fact, he discovered the model species Dictyostelium discoideum, which is the species used in the majority of the experimental work today.
It is hard to explain the huge variety of diatoms - a microorganism that has 100,000 species - in terms of natural selection.
My prime interests are in evolution and development. I use the cellular slime molds as a tool to seek an understanding of those twin disciplines.