Biology II

Ch.13 Objectives

1. Describe the favored model of heredity in the 19^th century prior to Mendel, and explain how this model was inconsistent with observations.

2. Explain how Mendel’s hypothesis of inheritance differed from the blending theory of inheritance.

3. List several features of Mendel’s metods that contribute to his success.

4. List four components of Mendel’s hypothesis that led him to deduce the law of segregation.

5. State, in your their words, Mendel’s law of segregation.

6. Use a Punnett square to predict the results of a monophybrid cross and state the phenotypic and genotypic ratios of the F₂ generation.

7. Distinguish between genotype and phenotype; heterozygous and homozygous; dominate and recessive.

8. Explain how a testcross can be used to determine if a dominate phenotype is homozygous or heterozygous.

9. Define random event, and explain why it is significant that allele segregation during meiosis and fusion of gametes at fertilization are random events.

10. Use the rule of multiplication to calculate the probability that a particular F₂ individual will be homozygous recessive of dominate.

11. Given a Mendelian cross, use the rule of addition to calculate the probability that a particular F2 individual will be heterozygous.

12. Describe to alternate hypothesis that Mendel considered for how to characters might segregate during gamete formation.

13. State, in their own words, Mendel’s law of independent assortment.

14. Use a Punnett square to predict the results of a dihybrid cross and state the phenotopic and genotopic ratios of the F₂ generation.

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