While working with the fruit fly Drosophila, a researcher discovers a single fly that is eyeless. He decides to mate this fly with a normal fly, and surprisingly, he found that all of the 65 offspring have eyes. What did he do wrong? What could explain these results? Is there another experiment/cross he could make to produce flies expressing the eyeless allele?

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.