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In 1910, Morgan did a series of experiments with the fruit fly Drosophila, an organism where females are XX and males are XY. When a mutant male fly with white eyes was crossed with a wild type female with red eyes, none of the F1 progeny had white eyes but 18% of the F2 progeny had white eyes. Unexpectedly, all of these white-eyed F2 flies were males. Based on these results, Morgan concluded that white eyes is caused by a recessive X-linked allele. Suppose Morgan had found that half of the F1 progeny had white eyes but all of these white-eyed F1 flies were females. In this case, a valid hypothesis would be

32. Carrier-mediated transport is also called  

38. What initiates the sodium-potassium pump?  

Based on their experiment with T2 bacteriophages, Hershey and Chase concluded that

An allele for a particular trait that is only expressed in the presence of a second copy of the same allele is called

Which statement about the genetic code is false?

44. THINK:  Matt is studying how the protein transferrin enters cells. He examines cells that have taken up transferrin, and finds clathrin-coated vesicles. What mechanism was used to take transferrin into the cell?  

49. The waste material from the Golgi Apparatus will leave the cell via a process known as _____________________. 

50. If a strand of mRNA attaches to a ribosome outside of the nucleus, this is known as  __________________ .

24. Osmosis occurs as water can cross the lipid bilayer through specialized channels for water movement called ________________.