12/12/14 Discussion Questions

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Presentation transcript:

12/12/14 Discussion Questions Using textbook pages 270-271 to help you (read over them carefully), please complete this dihybrid punnett square: BbSs x BbSs B=blue b = green S= shiny s = dull

Discussion Questions BbSs x BbSs B=blue b = green S= shiny s = dull 12/12/14 Discussion Questions BbSs x BbSs B=blue b = green S= shiny s = dull Phenotypic ratios 9:3:3:1 9 blue shiny 3 green shiny 3 blue dull 1 green dull

Reminders Root quiz 12-17-14 Exam 12-18-14 (chapters 10 & 11) Pick up your science fair project today please Go to room 1135 Tues or Thurs for Science Peer Tutoring during PLC

Today’s Objective: Objective: Identify and describe the stages and purpose of Meiosis as related to Genetics and Heredity. Review Mendel’s discoveries and simple Mendelian Genetics with monohybrid punnett squares and dihybrid punnett squares. Understand and explain NonMendelian inheritance patterns such as codominance and incomplete dominance and how to complete and use pedigrees in genetic studies

Pedigrees ppt 6

Pedigrees

Pedigrees are used to: Determine whether a trait is inherited Show how a trait is passed from one generation to the next To determine if an allele is dominant or recessive

Symbols: Female Male

Connecting Symbols: Married Couple Siblings

Generations I II III

Symbols: Affected Carrier Deceased

Sex-linked: Sex-linked issues… Are caused by genes located on X or Y chromosome More common in males since they have only 1 X chromosome; females more often carriers Female must have 2 recessive genes for trait to occur

Karyotypes To look for nondisjunction (chromosomes fail to separate) or other genetic disorders

Karyotypes To look for nondisjunction (chromosomes fail to separate) or other genetic disorders

Accessing Genetic Disorders Analyzing pedigrees Genetic counseling Prenatal testing

Pedigree Practice Problems If time remains

Exit Ticket 1. Please describe the purpose of meiosis. 2. What are homologous chromosomes? 3. Please describe Mendel’s research 4. Please compare monohybrid and dihybrid crosses