State a hypothesis and prediction that you think this experiment may have been designed to test. Which was the control group and which the experimental group? Why was a control group needed? List some variables that must have been controlled so as not to affect the results. Do the data support the hypothesis you chose? A mutation in a single gene may cause a major change in the body of a fruit fly, such as an extra pair of legs or wings.
Yet it takes many genes to produce a wing or leg. How can a change in just one gene cause such a big change in the body? What are such genes called? A mule is the offspring of a horse and a donkey. A donkey sperm contains 31 chromosomes and a horse egg 32 chromosomes, so the zygote contains a total of 63 chromosomes.
The zygote develops normally. The combined set of chromosomes is not a problem in mitosis, and the mule combines some of the best characteristics of horses and donkeys. However, a mule is sterile; meiosis cannot occur normally in its testes or ovaries. Explain why mitosis is normal in cells containing both horse and donkey chromosomes but the mixed set of chromosomes interferes with meiosis. Reece , Martha R.
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