The hypothesis to explain the formation of two different mutant phenotypes produced by the transposition of a yeast TE element into the gene for the enzyme X. One mutant lacked complete enzyme activity whereas second mutant have five times more enzyme activity than normal cells. Introduction: Transposable elements in yeast belongs to a family of dispersed and repeated retrotransposons in the genome of Saccharomyces cerevisiae . Saccharomyces cerevisiae is an important model organism to study the LTR (long terminal repeats)-retrotransposons biology. Five retrotransposon families are present in S. cerevisiae, designated as Ty1-Ty5. These Ty elements have a tendency to influence the genome organization. These Ty elements are the causal agents of mutation and genome rearrangment through recombination.

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6. The mammalian phylogenies (labeled a and b) were produced by two different research groups. a. In which tree do phylogenetic relationships most closely align with biogeography and why? (consult the Teeling and Hedges paper) b. What are the most closely related species to Chiroptera in each tree? Might the use of convergent traits for building phylogenies explain this difference? If so, which tree is most likely to have relied on convergent traits and why? c. What are some possible reasons that the two research groups came up with different phylogenies (in general terms)? describe at least three possible reasons.

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Chapter 15, Problem 15TYK

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The hypothesis to explain the formation of two different mutant phenotypes produced by the transposition of a yeast TE element into the gene for the enzyme X. One mutant lacked complete enzyme activity whereas second mutant have five times more enzyme activity than normal cells.

Introduction:

Transposable elements in yeast belongs to a family of dispersed and repeated retrotransposons in the genome of Saccharomyces cerevisiae. Saccharomyces cerevisiae is an important model organism to study the LTR (long terminal repeats)-retrotransposons biology. Five retrotransposon families are present in S. cerevisiae, designated as Ty1-Ty5. These Ty elements have a tendency to influence the genome organization. These Ty elements are the causal agents of mutation and genome rearrangment through recombination.

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