An Interactive Annotated World Bibliography of Printed and Digital Works in the History of Medicine and the Life Sciences from Circa 2000 BCE to 2022 by Fielding H. Garrison (1870-1935), Leslie T. Morton (1907-2004), and Jeremy M. Norman (1945- ) Traditionally Known as “Garrison-Morton”

16011 entries, 14068 authors and 1941 subjects. Updated: June 22, 2024

GRANT, Barbara Rosemary

2 entries
  • 14066

Evolution of character displacement in Darwin’s finches.

Science, 313, 224-226, 2006.

Through their more than 40 year study of Darwin's finches on the Island of Daphne Major in the Galapagos, the Grants demonstrated how natural selection can drive rapid changes in body and beak size in response to changes in the food supply. In the process the Grants elucidated the mechanisms by which new species arise and how genetic diversity is maintained in natural populations. Their results, which show that the effects of natural selection can be seen within a single lifetime, or sometimes within a couple of years, are in distinct contrast to the theories of Charles Darwin who thought that natural selection required extensive periods of time for its operation.

(Thanks to Juan Weiss for this reference and its interpretation.)

Subjects: EVOLUTION, ZOOLOGY › Ornithology
  • 14067

Evolution of Darwin’s finches and their beaks revealed by genome sequencing.

Science, 518, 371-375, 2015.

The authors sequenced the genome of 120 individuals representing all of Darwin’s finches. They found that a 240 kilobase haplotype encompassing the ALX1 gene, which encodes a transcription factor affecting craniofacial development, is strongly associated with beak shape diversity across Darwin’s finch species, as well as the medium ground finch (Geospiza fortis), a species that the Grants observed undergoing rapid evolution of beak morphology in response to the environmental changes described in their 2006 paper.
The authors saw variants of this gene in the finches, each of which encoded for a different type of beak morphology. These variants had arisen during natural selection processes.

Order of authorship in the original publication: Lamichhaney, Berglund, .... Grant, Grant.

(Thanks to Juan Weiss for this reference and its interpretation.)