Date post: | 31-Mar-2015 |
Category: |
Documents |
Upload: | destiny-lighter |
View: | 237 times |
Download: | 5 times |
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/mar/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 Phenotype
RR (++) Positive
Rr (+-) Positive
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)