Lecture10.BioSci97

Lecture10.BioSci97 - Announcements Lecture 10 Midterm exam...

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1 Announcements Lecture 10 Midterm exam is next Wednesday (Oct. 28) Send special seating requests to me by this Wednesday Focus on lecture material from Lectures 7 to 13 Use readings to supplement and clarify lectures In Lectures 7 to 13 I refer back to some material and concepts in Lectures 1 to 6 Make sure you can solve problems in a timely fashion
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2 Genes are on Chromosomes
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3 Sample Problem Lecture 9 13. An attached-X chromosome is one in which two X chromosomes are physically joined together, united by a single centromere. Thus, an attached-X segregates in meiosis like a single chromosome, but it contains the genetic information of two X chromosomes. We denote an attached-X by X-X . An attached-X female with white eyes ( X w - X w Y ; remember in flies the number of X chromosomes determines gender, not the Y) mates with a red-eyed male (remember that red-eyes is the dominant trait and that the complete absence of the red-eye allele X + results in white eyes, and the presence of at least one copy of the red-eye allele results in red-eyes). (1) List the genotypes of the F 1 progeny of this mating [1 point]. (2) Assuming that all progeny survive, what is the F 1 phenotypic ratio of red- eyed flies : white-eyed flies (do not worry about gender) [1 point]? Show the Punnett square for this cross for full credit. Sex in flies is determined by the number of X chromosomes (not by the presence or absence of a Y chromosome)
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4 Introduction to Human Genetics Lecture 10 Bio Sci 97 (B & C) Fall 2009
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5 Outline Lecture 10 More on pedigrees Multifactorial traits Quantitative traits Variance Phenotypic Genotypic Environmental Heritability
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6 Hemophilia A is an example of recessive
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