chapter 14 genetics

chapter 14 genetics - Chapter 14: Introduction to Genetics...

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Chapter 14: Introduction to Genetics (page 251-260) I. Introduction II. Mendel’s contribution to the study of inheritance A. Background B. Mendel’s experiments and explanation 1. Example: true-breeding tall x true-breeding dwarf peas 2. Explanation of results: Law of Segregation a. There are different forms of a single gene (called alleles) that account for variations in characters such as plant height, flower color, etc. b. Organisms inherit 2 copies of a gene for the same character (1 from each parent). c. If 2 alleles are different for a character, 1 allele masks the expression of the other allele (concepts of dominance and recessiveness). d. The 2 alleles for each character segregate (separate) when gametes are formed (Law of segregation). 3. Example: true-breeding tall, purple plants x true-breeding dwarf, white plants 4. Explanation of results: Law of independent assortment of genes—during the formation of gametes, alleles of 1 gene segregate independently of the alleles of a second gene. C. Terms with which you should be familiar: true-breeding, allele, homozygous, heterozygous, dominant, recessive, P, F1, F2, genotype, phenotype, genotypic ratio, phenotypic ratio. III. Solving genetics problems using rules of probability
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chapter 14 genetics - Chapter 14: Introduction to Genetics...

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