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Genetics Review
Sections 11.1-11.4, pages 335-337, 339-340
To prepare for the test, go back and review:
All assigned sections
Practice problems
Handouts and class activities
1. Define trait, loci, gene, allele.
2. Explain why the blending hypothesis was eventually rejected as the method of
3. Describe Mendel’s particulate hypothesis of inheritance.
4. What characteristics make pea plants ideal organisms for genetic studies?
5. What does it mean to be true-breeding?
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
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 disorders have to be recessive?
12. Be able to conduct dihybrid crosses and determine genotypic and phenotypic
13. Explain the Law of Segregation.
14. Explain Mendel’s principle of independent assortment.
15. Be familiar with the “Exceptions” to Mendel’s Rules (5-6). (Why are they
16. Be able to conduct Punnett Square crosses involving exceptions to Mendel’s
17. Why are some alleles written as a letter/symbol as an exponent on a base letter?
18. What is unique about a heterozygous individual exhibiting Incomplete
Dominance (intermediate inheritance)?
19. What does it mean for alleles to be Codominant?
20. What is a good example of a trait that is controlled by both Codominance and
Multiple alleles?
21. How does polygenetic inheritance differ from having multiple alleles?
22. Explain the role of the environment in determining an organism’s phenotype.
23. Which chromosomes are important for sex-linked inheritance?
24. Which sex is more often affected by sex-linked disorders? Why?