Edmands - Chapter 14 Mendel and the Gene Idea 17:00:00...

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Chapter 14: Mendel and the Gene Idea 28/08/2007 18:00:00 Mendel used the scientific approach to identify two laws of inheritance Mendel’s main studies were focused on peas and their different  characteristics such as flower color (purple or white), actual color (green or  yellow) and texture (smooth or wrinkled) o character is a heritable feature e.g. flower color o trait is a variation of the characters e.g. purple or white o True-breeding plants have offspring with the same characteristics as  themselves when they self-pollinate o Hybridization is crossing two true-breeding plants Mendel had an  experimental quantitative approach o Christian Doppler was very influential in development of Mendel’s such  approach o Recessive vs.  dominant traits were compared and the effects tested Purple dominant over white Round dominant over wrinkled Yellow dominant over green Advantages in Mendel’s use of peas o Controllable mating phenomenon amongst the plants Usually peas self-fertilize but to enable cross pollination Mendel  dusted pollens from another plant into an immature plant o Short generation time o Many distinct traits THE LAW OF SEGREGATION o Two  alleles for a  heritable character separate ( segregate) during  gamete formation and end up in different gametes Mendel’s Model
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1. Alternative versions of genes account for  variations in inherited  characters Can be connected to chromosomes and the placement of DNA  at the locus 2. For a character, an organism inherits 
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This note was uploaded on 01/22/2009 for the course BISC 120Lg taught by Professor 11:00-01:50pm during the Fall '06 term at USC.

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Edmands - Chapter 14 Mendel and the Gene Idea 17:00:00...

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