Chapter 9 Notes - I Chapter 9 Patterns of Inheritance Heritable Variation and Patterns of Inheritance a Heredity the transmission of traits from one

Chapter 9 Notes - I Chapter 9 Patterns of Inheritance...

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Chapter 9 – Patterns of Inheritance I. Heritable Variation and Patterns of Inheritance a. Heredity : the transmission of traits from one generation to the next. b. Genetics : the scientific study of heredity (inheritance). c. In an Abbey Garden i. Character : a heritable feature that varies among individuals within a population, such as flower color in pea plants. ii. Trait : a variant of a character found within a population, such as purple flowers in pea plants. iii. Hybrid : the offspring of parents of two different species or of two different varieties of one species; the offspring of two parents that differ in one or more inherited traits; an individual that is heterozygous for one or more pairs of genes. iv. Cross : the cross-fertilization of two different varieties of an organism or two different species; also called hybridization. v. P generation : the parent individuals from which offspring are derived in studies of inheritance. P stands for parental. vi. F 1 generation : the offspring of two parental (P generation) individuals. F 1 stands for the first filial. vii. F 2 generation : the offspring of the F 1 generation. F 2 stands for second filial. d. Mendel’s Law of Segregation i. Monohybrid Crosses 1. Monohybrid cross : a mating of individuals different at one genetic locus. 2. Hypotheses a. There are alternative versions of genes that account for variations in inherited characters. i. Allele : an alternative version of a gene. b. For each inherited character, an organism inherits two alleles, one from each parent. i. Homozygous : having two identical alleles for a given gene. ii. Heterozygous : having two different alleles for a given gene.

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