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Chapter 9

Section 1: Mendal's Legacy

TermDefinition
Genetics The field of biology devoted to understanding how characteristics are transmitted from parents to offspring
Heredity The transmission of characteristics from parent to offspring
Trait A genetically determined variant of a characteristic
Pollination When a pollen grain produced in the male reproductive parts of a flower are transferred to the female parts
Self-Pollination When pollen is transferred from the anthers of a flower to the stigma of either that flower or another flower on the same plant
Cross-Pollination Occurs between the flowers of two plants
True-Breeding Always produce offspring with that trait when self-pollination occurs
P Generation The true-breeding parents
F1 Generation The offspring of the P generation
F2 Generation The offspring of the F1 generation
Dominant Describes the allele that is fully expressed when carried by only one of a pair of homologous chromosomes
Recessive Describes a trait or an allele that is expressed only when two recessive alleles for the same characteristic are inherited
Law of Segregation States that a pair of factors is segregated, or separated, during the formation of gametes
Law of Independent Assortment States that factors separate independently of one another during the formation of gametes
Molecular Genetics The study of the structure and function of chromosomes and genes
Allele Each of two or more alternative forms of a gene
Created by: McLeanE18