PPT-19.2 Multiple Alleles

In a population there may be more than two alleles for a given trait If a gene exists in more than two alleles it is said to have multiple alleles Coat colour in rabbits Eg Coat colour in rabbit controlled by 3 alleles. In fact we already did this when we were discussing the ABO blood group polymorphism Just to get some notation out of the way though lets de64257ne ij as the frequency of genotype and as the frequency of allele Then ij if if Unfortunately the simpl be 10/13(midterm-yes . includes all up to now). I have the genetics review up on my page already, it would be wise for you to go ahead and start it. 2. nd. set of journals due 10/7. Incomplete Dominance. What you should know:. The ‘etiquette’ used to represent genetic crosses.. Know what is, and how to represent a monohybrid cross.. Know what is, and how to represent a cross showing sex-linkage.. Exceptions. 1.31.13. Mendelian. Exceptions. Mendel got lucky – all 7 traits he studied showed . complete . (simple). dominance. .. Mendelian. Exceptions. Mendel got lucky – all 7 traits he studied showed . Punnett. Squares and to discuss independent assortment and different types of dominances. . 11.3. Independent assortment. Do alleles get passed together to the next generation?. 2 Factor Cross. (RRYY x . What you should know:. The ‘etiquette’ used to represent genetic crosses.. Know what is, and how to represent a monohybrid cross.. Know what is, and how to represent a cross showing sex-linkage.. Patterns of inheritance. Learning outcomes. (. i. ) . genetic diagrams to show patterns of . inheritance. To . include monogenic inheritance, dihybrid inheritance. , multiple alleles, sex linkage. and codominance.. Exceptions. Mendelian. Exceptions. Mendel got lucky – all 7 traits he studied showed . complete . (simple). dominance. .. Mendelian. Exceptions. Mendel got lucky – all 7 traits he studied showed . http://faculty.pnc.edu/pwilkin/incompdominance.jpg. . http://www.dobermann-review.com/info/genetics/mendels_genetic_laws/Gregor%20Mendel.jpg. . HUH?. Incomplete Dominance. Neither allele is completely dominant over the other allele.. Multiple Alleles. More than 2 alleles for a gene. Dominance hierarchy (one allele dominates over the other). Ex. Fruit Fly eye colour . 4 alleles: Red, Apricot, Honey, White. To show dominance hierarchy use first letter of the gene name (E=Eye colour) and a superscript to reflect how dominant it is (1 is most dominant). LinkageLinkage can be physical or statistical wefocus on physical - easier to understandBecause of recombination Mendel developslaw of independent assortmentBut loci do not always assort independently Genes which have more than two 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).. Review 8. Important Vocabulary. Gene – piece of a chromosome that codes for a trait. Trait – a specific characteristic that varies from one individual to another. You are your parents!. Dad’s chromosomes. Homothallism.  refers to the possession, within a single organism, of the resources to reproduce sexually i.e., having male and female reproductive structures on the same . thallus. .. . The opposite sexual functions are performed by different cells of a single mycelium..