BioStudy2 - winged males and long-winged females and wide-winged females Why is this what happened The results in the second trial would not come

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Preston Bio 22 Feb 1 , 2008 Weekly Study Question # 2 You are an evolutionary biologist, currently, experimenting with genetics. You are able to work with a rare but beautiful species of butterfly. These butterfly have two different wing shapes: narrow and wide. You observe the majority of the males to have narrow wings. Furthermore, you proceed to breed a pair of butterflies; a wide-winged female with a long-winged male. Their offspring include males and females that all have wide wings. You breed two more for further examination and find that in their offspring, the F2 generation, 100% of the females have wide wings, 50% of the males wide wings, and the other 50% have narrow wings. After leaving the jar of female butterflies in the sun for several days, you decide you would like to try this experiment again. This time you get long-winged males and wide-
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Unformatted text preview: winged males and long-winged females and wide-winged females. Why is this, what happened? The results in the second trial would not come as a surprise if the genotypes of the original parents were X W X w and X w Y. However, it is more logical to assume the parental genotypes are X W X W and X w Y. In considering this, all of the offspring in the first trial are expected and this phenomenon can be explained. When the jar of females was left out in the sun for several days they received a great deal of exposure to UV rays. Excess UV rays are harmful to many of the creatures that inhabit earth, aside from this; they are also known to cause mutations from time to time. This is definitely a silent point mutation, in that there is a change in genotype but no change in phenotype....
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This note was uploaded on 05/23/2008 for the course BIOL 22 taught by Professor Preston during the Winter '08 term at Santa Clara.

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