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Gentetics 4. polygenic traits and multiple alleles.notebook January 10, 2017 Aim : other factors affecting the expression of traits. Genetics homework : Read section 11.3 and answer questions 1 and 2. Finish problems worksheet Sex linked and influence of environment. Unit test 1/17 E day. 1. Quiz 2. Explanation of multipe alleles and polygenic traits. 3. Sex linked inheritance. 4. Work on problems • Polygenic traits (most common in nature) Aim Polygenic traits: • Some traits are controlled by the interaction of several genes . This traits often show a great range of phenotypes in the population. For example the human population skin color, and human height. Dihybrid cross 1 Gentetics 4. polygenic traits and multiple alleles.notebook January 10, 2017 • Gene Linkage: When genes for 2 different traits are located very close in the same chromosome they usually are inherited together. They seem to violate the law of independent assortment. examples include: Jan 111:04 PM • Genes and environment (epigenetics): The environment plays a role in the way a gene is expressed in an organism. Exampl Fur color in hares Jan 79:53 AM 2 Gentetics 4. polygenic traits and multiple alleles.notebook January 10, 2017 Sex linked inheritance: Are mutations that occur on the genes in the X chromosome, therefore they affect more males than females. Disorders include: Hemophilia (inability of blood to clot) Red green colorblindness XX= Female Xy = male Fix the mistakes in the pedigree diagram so that it fits inheritance of a sex linked disease. Jan 46:56 PM Summary of our current understanding of Mendel laws Traits are determined by genes (factors) that are passed from parents to offspring in their sex cells. Some traits are dominant other are recessive ( F1) Mono hybrid cross • Most traits are controlled by 2 genes one from each parent. They segregate as gametes form (egg and sperm) form, and recombine during fertilization (F2) Law of independent assortment. What was the evidence? • The genes for different traits usually segregate independently of one another. (demonstrated with dihybrid crosses) What are the other patterns of inheritance? • incomplete dominance • codominance • Polygenic traits • Linked genes Summary of Mendel Laws. 3 Gentetics 4. polygenic traits and multiple alleles.notebook January 10, 2017 Jan 1012:28 PM 4