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Multiple Alleles

Multiple Alleles. Genetics Unit Biology 30 Mrs. S. Pipke-Painchaud. Multiple Alleles. have 3 or more alleles for the same gene (or at a single locus)  In Other Words – there are 3 or more alleles that create the different traits. 

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Multiple Alleles

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  1. Multiple Alleles Genetics Unit Biology 30 Mrs. S. Pipke-Painchaud

  2. Multiple Alleles • have 3 or more alleles for the same gene (or at a single locus)  • In Other Words – there are 3 or more alleles that create the different traits.  • at most one individual will have 2 alleles or 1 pair  (unit factors exist in pairs.)  • in a species, however, many alternative forms exist 

  3. Example – ABO Blood Group • this deals with the presence of antigens • These are like labels/ name tags on the blood cells. • Each individual has 1 of 4 phenotypes • Type A • Type B • Type AB • Type O • What are you? http://www.rrsd.mb.ca/ResourcesandProjects/grade8/images/red%20blood%20cells.jpg

  4. The Info You Need To Know • Gene designated is I (isoagglutinogen) • I  = A antigen • I  = B antigen • i  = no antigen  • IA and IB are bothcodominant • IA and IB are both dominant to I (type O)

  5. http://learn.genetics.utah.edu/units/basics/blood/types.cfm

  6. Website Resoures • Nobel Prize – Blood Typing Website: • http://nobelprize.org/educational_games/medicine/landsteiner/readmore.html • View for animations and background info on blood types. • Wikipedia – Blood Types • http://en.wikipedia.org/wiki/Blood_type • Contains a chart of blood types by nation. • Maps of the Distribution of Human Blood Types all over the World. • http://anthro.palomar.edu/vary/vary_3.htm • Sickle Cell Anemia Example: • http://www.astrographics.com/GalleryPrintsIndex/GP2146.html

  7. Did You Know? • B is the rarest allele. • 16% of the population have it. • Distribution of Blood Types • http://anthro.palomar.edu/vary/vary_3.htm http://www.uwosh.edu/med_tech/teaching/ElementaryHemeWeb/LEARN%20ABOUT%20RBCS%20AND%20PLTS.htm http://www.faqs.org/health/images/uchr_01_img0015.jpg

  8. Wikipedia: http://en.wikipedia.org/wiki/Image:ABO_blood_type.svg

  9. Practice • If a person with Type A (Heterozygous) blood married and had children with a person who has Type B (Heterozygous) blood, what would the genotypic and phenotypic ratios be? • IAi X IBi Genotypic Ratio: 1 IAIB : 1 IAi: 1 IBi: 1 ii Phenotypic Ratio: 1 AB: 1 A: 1 B: 1 O

  10. Practice • If you crossed a person with type 0 with heterozygous type B, what would the phenotypic ratio be? • ii X IBi • Phenotypic Ratio: • 1 B : 1 O

  11. Website Resoures • Nobel Prize – Blood Typing Website: • http://nobelprize.org/educational_games/medicine/landsteiner/readmore.html • View for animations and background info on blood types.

  12. The End of this concept Try the assigned questions in the duotang:-)

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