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BIO-0013 (103)
Mc Vey (25)
Lecture

10-25-12.docx

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Department
Biology
Course
BIO-0013
Professor
Mc Vey
Semester
Fall

Description
10­25­12 • Genetics: the mechanisms of hereditary transmission and the variation of inherited  characteristics among related organisms • Genes: pieces of DNA that encode for proteins or functional RNAs o Determine phenotypic traits o Mutations alter RNA sequences and can create novel phenotypes • Gregor Mendel: o What made his experiments so successful?  Chose a good model system—the garden pea (Pisum sativum)   He could control mating between the plants  Chose easy to study traits  Kept careful records of his experiments  He was lucky • Traits segregated independently • Year 1: monohybrid crosses o Experiment 1: 60 cross pollinations with 15 plants  Conclusion: round trait is dominant over wrinkled, which is  recessive Seed shape gene: o Seed shape gene codes for an enzyme called SBE1  Starch­branching enzyme important for starch biosynthesis  Limitation in starch biosynthesis found in pea plants that inherit 2  copies of r allele • Increase in the accumulation of sugars and a change in the  osmotic pressure in the deve
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