I am writing to tell you about the exciting opportunity we have been given to take a group of students to the Oxford University Museum of Natural History for a DNA workshop. This event takes place on Friday 1st March 2013, 9.30-3.00 pm.
Students will use PCR to investigate human evolution. It will involve them analysing and comparing their version of a bitter taste receptor gene to their ability to taste. Students will learn about molecular biology techniques by using research-quality equipment. The workshop will be relevant for all Year 12 Biologists as it complements several areas of the course.
We will meet outside Oxford University Museum of Natural History at 9.15am on the Friday; students will have to make their own way to and from the Museum for this visit and will be registered on site. Students will need to bring a packed lunch and a drink as there are no lunch facilities at the museum.
1.Fish have developed specialised gas-exchange organs called gills, which are composed of thousands of filaments.
2.The filaments in turn are covered in feathery lamellae which are only a few cells thick and contain blood capillaries.
3.This structure gives a large surface area and a short distance for gas exchange.
4.Water flows over the filaments and lamellae, and oxygen can diffuse down a concentration gradient the short distance between water and blood, whilst CO2 diffuses in the opposite direction, also down its concentration gradient.
5.Each gill is covered by a muscular flap (the operculum) on the side of a fish's head.
6.The gills are so thin that they cannot support themselves without water, so if a fish is taken out of water after a while the gills will collapse, the SA/Vol ratio falls, and the fish suffocates.