Question 1
Thalassemias are primarily caused by:
◦ base substitutions that alter α or β globin genes.
◦ deletions that eliminate α or β globin genes.
◦ base substitutions that alter γ or δ globin genes.
◦ deletions that eliminate γ or δ globin genes.
◦ insertions that alter α or β globin genes.
Question 2
The crossover fixation model predicts that:
◦ any sequence of DNA that is not under selective pressure will be taken over by a series of identical tandem repeats.
◦ any sequence of DNA that is under selective pressure will be taken over by a series of identical tandem repeats.
◦ any sequence of DNA that is not under selective pressure will be taken over by a series of nonidentical tandem repeats.
◦ any sequence of DNA that is under selective pressure will be taken over by a series of nonidentical tandem repeats.
◦ any sequence of DNA that is not under selective pressure will gradually reduce its frequency of crossing over.
Fluid mosaic model
computer model of the AIDS virus
Model of transporter passage through an NPC
Marcel Breuer, Armchair, Model B3.
A model for RecA-mediated strand exchange
James Watson and Francis Crick’s metal-and wire model of DNA