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Non- Mendelian Genetics Part 1

Non- Mendelian Genetics Part 1. Happy 2014!! BELL WORK :. Write out the steps for solving a monohybrid (ONE TRAIT) Punnett square. I’ll help you begin… Draw a four-box Punnett square. Using the information given to you, figure out the alleles (LETTERS) for each parent.

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Non- Mendelian Genetics Part 1

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  1. Non-Mendelian GeneticsPart 1

  2. Happy 2014!!BELL WORK: • Write out the steps for solving a monohybrid (ONE TRAIT) Punnett square. I’ll help you begin… • Draw a four-box Punnett square. • Using the information given to you, figure out the alleles (LETTERS) for each parent. • Write the alleles… (finish writing the steps from here)

  3. CO: I will predict possible genetic outcomes using non-Mendelian inheritance and pedigrees.LO: I will draw a pedigree for a sex-linked trait in a family with a partner.

  4. REMEMBER:Mendel’s principles form the basis of the modern science of genetics.The inheritance of biological characteristics is determined by specific segments of DNA called genes.Genes are passed from parents to their offspring.

  5. Today we’re going to talk about a special case: sex-linked traits • Remember: Each person inherits an X chromosome from mom and either an X or a Y from dad • We use the letters X and Y to represent chromosomes (not alleles)

  6. Sex-linked traits • Are traits that are determined by either the Y or X chromosome • If they are determined by the Y chromosome they are referred to as “Y-linked” • Y-linked disorders are very rare and often cause infertility in men • If they are determined by the X-chromosome they are referred to as “X-linked”

  7. X-linked dominant • These conditions (such as vitamin D resistant rickets) are rare and can affect both men and women • Men are more affected than women • Both men and women can pass on the affected chromosome to their children

  8. In 18 words summarize these two diagrams.

  9. X-linked recessive • These disorders (such as hemophilia and color blindness) more frequently affect men than women • Both men and women can pass these traits on to their children (at different rates) • An affected man/unaffected woman will have sons who are unaffected and daughters who are carriers • An affected woman/unaffected man will have a 50% chance of passing the trait. If she passes on her affected X chromosome, then her daughters will be carriers and her sons will be affected • This is why men are more likely to be color blind than women

  10. Pedigree chart: a chart that shows relationships within a family.

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