BSC 2011C Lecture 7: Chapter 52- Introduction to Ecology and the Biosphere

The mutants w, s and t are recessive, autosomal and linked, withw lying at position 10, s at 20 and t at 40 of the linkage map. Thecoefficient of coincidence is 0.6. A testcross w + t / + s + X w st / w s t results in a total of 500 progeny. Predict the number ofindividuals expected to be + + t, + s t, and + s + inphenotype.

An amphipathic protein helix is lying flat one the surface of a lipid bilayer membrane. Which of the following sets of amino acids would most likely face away from the lipid bilayer and towards water?

A. S-W-I-L-T

B. F-G-I-L-P

C. A-C-D-E-H

D. I-L-M-F-V

E. Y-W-W-L-R