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. 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.. Other Patterns of Inheritance. Not all genes show a simple pattern of inheritance…. Many genes have more than two alleles. Many traits are controlled by more than one gene. Complete Dominance. Definition: . What you need to know. Ahmed . Rebai. Ahmed.rebai@cbs.rnrt.tn. DNA.. The code of life. DNA . is. a . molecule. made of four bricks . Living . cells. /. organisms. have DNA . within. . it. DNA . contains. 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. a . gene inheritance pattern in which . at least . three unique alleles are present for one trait. the . three alleles may interact with each . other . using any other pattern (Dominant/Recessive, Incomplete Dominance, Codominance, etc.). 7/22/2009 t housands of different g enes and g typically have two copies of every The two copies (or alleles) of the gene may or may not be identical, and one may be dominant in determining the phen A verage No. of alleles per locus G enetic diversit y G1 6217204.60.440.41G2 6625436.90.60.56G3 6621515.80.490.46Total 194641417.31.541.43 Li et al./Breeding Science doi:10.1270/jsbbs.66.15124 Suppl 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 Exceptions. Mendel got lucky – all 7 traits he studied showed . complete . (simple). dominance. .. Mendelian. Exceptions. Mendel got lucky – all 7 traits he studied showed . complete . (simple). 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..