PDF-Group No of varietiesNo of alleles

A verage No of alleles per locus G enetic diversit y G1 62172046044041G2 6625436906056G3 66215158049046Total 1946414173154143 Li et alBreeding Science doi101270jsbbs6615124 Suppl. Kalinowski Department of Ecology Montana State University Bozeman MT 59717 USA fax 14069943232 email skalinowskimontanaedu Received 5 January 2004 accepted 16 February 2004 Key words allelic richness estimation genetic diversity rarefaction sample s 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.. 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. E.g. Coat colour in rabbit controlled by 3 alleles. Sex linkage . and multiple alleles. Starter – sickle cell anaemia. Genotype. Hb. A. Hb. A. Hb. A. Hb. S. Hb. S. Hb. S. Phenotype. Normal. Sickle cell trait. Sickle cell anemia. Type of heamogolbin. 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.. Making melanin pigment. The . TYR. gene is just one of many genes on the human number-11 chromosome. . The . TYR. gene encodes a protein that functions as the enzyme, . tyrosinase. . This enzyme catalyses a step in the pathway that produces the pigment, . 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.. Natural Selection. Definition. : A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals . because. of those traits. Stresses from the environment creates situations where the organisms with a beneficial trait will survive and reproduce, those without will die off. 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). The change in allele frequencies in populations due to . chance. (not selection). . Can include the loss of alleles from the gene pool.. Genetic drift. The change in allele frequencies in populations due to . 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 and Their Carriers . Using Compressed Se(. que. ). nsing. Or . Zuk. Broad . Institute of MIT and . Harvard. orzuk@broadinstitute.org. In collaboration with: . Amnon. Amir. Dept. . of Physics of Complex Systems, Weizmann . 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.