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Honors Biology Chapter 9 Review 1. Explain why the blending hypothesis was eventually rejected as the method of inheritance? 2. Define trait, loci, gene, allele. 3. Describe Mendel’s particulate hypothesis of inheritance. 4. What does it mean to be true-breeding? 5. What characteristics make pea plants ideal organisms for genetic studies? 6. Differentiate between homozygous and heterozygous genotypes. 7. How many alleles does it take to show a dominant trait? 8. Be able to conduct monohybrid crosses and determine genotypic and phenotypic ratios. 9. How are testcrosses used to determine unknown genotypes? 10. Be able to analyze a pedigree and explain how traits are passed. 11. Do harmful disorder have to be recessive? 12. Why might a person want to know if they, or their child, have a genetic disease? 13. Be able to conduct dihybrid crosses and determine genotypic and phenotypic ratios. 14. Explain the Law of Segregation. 15. Explain Mendel’s principle of independent assortment. 16. Be able to use the rule of addition and the product rule to solve for probabilities. 17. Be familiar with the “Exceptions” to Mendel’s Rules. (Why are they exception?) 18. Be able to conduct Punnett Square crosses involving exceptions to Mendel’s Rules. 19. Why are some alleles written as a letter/symbol as an exponent on a base letter? 20. What is unique about a heterozygous individual exhibiting Incomplete Dominance (intermediate inheritance)? 21. What does it mean for alleles to be Codominant? 22. What is Pleiotropy? 23. How does polygenetic inheritance differ from having multiple alleles? 24. Explain the role of the environment in determining an organism’s phenotype. 25. What does it mean if genes are linked? 26. Which chromosomes are important for sex-linked inheritance? 27. Which sex is more often affected by sex-linked disorders? Why?