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Lecture 35

BIOL 1000 Lecture 35: Lecture 35

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Biological Sciences
BIOL 1000
Kevin G.Scott

Oc78 Chapter 9: Patterns of Inheritance Experimental Genetics Began in an Abbey Garden Heredity = transmission of traits from one generation to the next  Genetics = scientific study of heredity  Gregor Mendel was the father of genetics – bred garden peas Parents pass on to their offspring discrete “heritable factors”  Heritable factors (genes) retain their individuality generation after generation o  Genes may be rearranged but each gene permanently retains its identity Garden peas have short generation times, produce large numbers of offspring from each mating and  came in readily distinguishable varieties Character = a heritable feature that varies among individuals (e.g. flower colour)  Trait = each variant for a character (e.g. purple vs. white flowers)  Mendel was able to control mating Self-fertilize = sperm-carrying pollen grains released from the stamens land on the egg-containing carpel of the same flower  Cross-fertilization = fertilization of one plant by pollen from a different plant Prevent self-fertilization by cutting off immature stamens of a plant before they produce pollen Cross-fertilize stamen-less flowers by dusting its carpel with pollen from another plant Carpel develops into a pod, containing seeds/peas Seeds grow into offspring plants Always sure of parentage of new plants using this process  Mendel chose 7 characters to study, each occurred as 2 distinct traits True-breeding varie
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