Complex Inheritance Patterns

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Presentation transcript:

Complex Inheritance Patterns Polygenic Inheritance Incomplete Dominance Codominance Environmental Factors

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

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

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

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

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

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/

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

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

http://www. google. com/imgres 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:0

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 Genotype Phenotype RR (++) Positive Rr (+-) Rr (--) negative

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)