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Complex Inheritance Patterns

Complex Inheritance Patterns. Polygenic Inheritance Incomplete Dominance Codominance Environmental Factors. Heredity. Genetics Study of GENES Heredity Study of INHERITANCE PATTERNS Passing of traits from parents to offspring. Types of Complex Inheritance. Polygenic

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Complex Inheritance Patterns

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  1. Complex Inheritance Patterns Polygenic Inheritance Incomplete Dominance Codominance Environmental Factors

  2. Heredity • Genetics • Study of GENES • Heredity • Study of INHERITANCE PATTERNS • Passing of traits from parents to offspring

  3. Types of Complex Inheritance • Polygenic • Polygon: Multiple sides • Polygamy: Multiple marriages • Polytheism: Multiple gods • Polygenic: Multiple GENES • Incomplete Dominance • Codominance • Environmental Factors

  4. Polygenic Inheritance • Multiple alleles (more than two options) • Genes spread over different locations or chromosomes • MANY different combinations and mixes • Examples: • Hair color • Eye color • Skin color • Degrees of extremes (Dark to light, etc) http://discovermagazine.com/2007/mar/eye-color-explained

  5. Incomplete Dominance • MIXING • Snapdragons: • Red (R1) • White(R2) • Pink(R1R2) http://www.massasoit-bio.net/courses/136/136_courseassets/cummings_animations/snapdragon_crosses.html

  6. Hair Type • Straight Hair: Homozygous: Incomplete Dominant • Curly Hair: Homozygous: Incomplete Dominant • Wavy Hair: Heterozygous: A mix (Straight and Curly)

  7. Environmental Factors • Some genes are only expressed under certain ENVIRONMENTAL CONDITIONS Hydrangea Arctic Fox http://www.interiorofficeplants.com/http:/www.interiorofficeplants.com/why-hydrangeas-are-different-colors/

  8. Gender Determination • Alligators, Tortoises and Turtles • Temperature changes the gender of offspring! EXAMPLE: • Female if Hot • Male if Cold

  9. Codominance • Multiple alleles are DOMINANT over others • Blood Type: • Dominant Types: A and B • Recessive Types: O • AA or AO=Type A • BB or BO=Type B • AB=Type AB • OO=Type O

  10. http://www.google.com/imgres?um=1&hl=en&sa=N&rlz=1C1SNNT_enUS408US408&authuser=0&biw=1366&bih=667&tbm=isch&tbnid=8PsfdtfL6lbTEM:&imgrefurl=http://learn.genetics.utah.edu/content/begin/traits/blood/types.html&docid=MBMmwYaFY_nyrM&imgurl=http://learn.genetics.utah.edu/content/begin/traits/blood/images/ABObloodsystem.gif&w=489&h=285&ei=4cdWT46aLOnE2wX08cnlCQ&zoom=1&iact=hc&vpx=735&vpy=198&dur=2272&hovh=171&hovw=294&tx=158&ty=70&sig=115824390853095710786&page=1&tbnh=115&tbnw=197&start=0&ndsp=18&ved=1t:429,r:3,s:0http://www.google.com/imgres?um=1&hl=en&sa=N&rlz=1C1SNNT_enUS408US408&authuser=0&biw=1366&bih=667&tbm=isch&tbnid=8PsfdtfL6lbTEM:&imgrefurl=http://learn.genetics.utah.edu/content/begin/traits/blood/types.html&docid=MBMmwYaFY_nyrM&imgurl=http://learn.genetics.utah.edu/content/begin/traits/blood/images/ABObloodsystem.gif&w=489&h=285&ei=4cdWT46aLOnE2wX08cnlCQ&zoom=1&iact=hc&vpx=735&vpy=198&dur=2272&hovh=171&hovw=294&tx=158&ty=70&sig=115824390853095710786&page=1&tbnh=115&tbnw=197&start=0&ndsp=18&ved=1t:429,r:3,s:0

  11. Rh+ and Rh- • Simple dominance and recessiveness • Rh+ is the DOMINANT trait (R) • Rh- is the RECESSIVE trait (r) • + (Positive) simply means you carry Rh factor

  12. Want to know your blood type? • Legally, we can’t do the lab anymore  • BUT…you can find out by Donating Blood  • Here’s an example though… • My blood type is O (I’m a universal donor) • My brother is AB (He’s a universal acceptor) • What are my parents? • (Let’s do this on the board…it’ll be easier)

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