complex inheritance patterns
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Complex Inheritance Patterns
Polygenic InheritanceIncomplete Dominance
CodominanceEnvironmental Factors
HeredityGenetics
Study of GENES
HeredityStudy of INHERITANCE PATTERNSPassing of traits from parents to offspring
Types of Complex InheritancePolygenic
Polygon: Multiple sidesPolygamy: Multiple marriagesPolytheism: Multiple godsPolygenic: Multiple GENES
Incomplete Dominance
Codominance
Environmental Factors
Polygenic InheritanceMultiple alleles (more than two options)Genes spread over different locations or
chromosomesMANY different combinations and mixesExamples:
Hair colorEye colorSkin color
Degrees of extremes (Dark to light, etc) http://discovermagazine.com/2007/m
ar/eye-color-explained
Incomplete DominanceMIXINGSnapdragons:
Red (R1)
White(R2)
Pink(R1R2)http://www.massasoit-bio.net/courses/136/136_courseassets/cummings_animations/snapdragon_crosses.html
Hair TypeStraight Hair: Homozygous: Incomplete
DominantCurly Hair: Homozygous: Incomplete
DominantWavy Hair: Heterozygous: A mix (Straight
and Curly)
Environmental FactorsSome genes are only expressed under certain
ENVIRONMENTAL CONDITIONSHydrangea Arctic Fox
http://www.interiorofficeplants.com/http:/www.interiorofficeplants.com/why-hydrangeas-are-different-colors/
Gender DeterminationAlligators, Tortoises and Turtles
Temperature changes the gender of offspring!
EXAMPLE:Female if HotMale if Cold
CodominanceMultiple alleles are DOMINANT over othersBlood Type:
Dominant Types: A and BRecessive Types: O
AA or AO=Type ABB or BO=Type BAB=Type ABOO=Type O
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 PhenotypeRR (++) PositiveRr (+-) PositiveRr (--) 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)