Dr Holmes explains how the frequency in a population of a mutant gene with selective advantage is likely to increase in successive populations. Excerpts from a film made by Dr Kettlewell and Professor Tinbergen about two varieties of peppered moth is used to demonstrate this effect.
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Duration: 00:06:27
Keyword(s): Genetics, mutation, Peppered moth, Evolution, natural selection, Dr Bernard Kettlewell.
Contributor(s): Dr Richard Holmes, Dr Peggy Varley
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Footage description: B/W. Holmes speaking in the studio to camera. He walks over to a board displaying a frquency line graph. He points at the graph while speaking. He continues to look at the graph and to camera while speaking. Varley speaking in the studio to camera. Camera pans back to reveal a moth trap on a table. Varkley speaking. She removes the top of the trap and picks up the egg cartons inside. Moths inside fly out. Varley moves to another table. She opens a container and shakes out a black peppered moth. It lands next to a pale coloured moth on a sloping board. Close up of moths and tweezers held by Varley. It flies away. Varley speaking and pointing at pale moth. Varley moves to map of UK on a board showing distribution of the peppered moth populations by Dr Kettlewell. Varley points to various circles on the map while speaking. She walks over to a tree trunk covered in lichen. Varley points to the two varieties of Peppered moth on the trunk. Varley points to a second tree trunk blackened with soot. She points to the two varieties of Peppered moth on the trunk. Varley speaking to camera. Film of Kettlewell marking moth's with paint. Kettlewell gluing moths to a tree trunk. Close up of moths on the bark. Birds flying in and picking off moths from the tree trunk. Hand pointing to remaining pale moths. Bird with moth in its beak. Hand pointing to moths on another tree trunk. Two birds on a branch. They fly to tree trunk and eat moths. Hand points to remaining dark moths. Varley in the studio speaking to camera.
Master programe code and title: S100/19 Natural selection
Master programme recording date: 30/05/1971
Master programme first presentation: 1971
Master programe filename: S100_1971X_BX_V019.avi
Master programme production number: JOUZ373H
Available to public: yes