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Hrincevich+CH+12+student+outline - Patterns of Inheritance...

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Patterns of Inheritance Chapter 12
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How are Traits Controlled? Many traits in humans are NOT controlled by one gene, but by MANY genes Eye color, Height, Hair color, etc. Several traits in humans that are controlled by ONE gene, makes it easy to determine your phenotype and possibly your genotype The presence or absence of these traits does not express anything meaningful. You are not a freak if you have/lack these traits!
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X Examples of single gene control we looked at before
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0 10 20 30 40 50 60 70 80 90 widows peak ear lobes tongue roller digit hair hand crossing DOM rec yes no free attached left on top right on top Do any of these not follow what you would have expected? 0
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Single Gene Variation Dominant allele vs. recessive allele Earlobes EE or Ee was free/unattached phenotype (homozygous dominant or heterozygous) ee was attached phenotype (homozygous recessive) Easy way to examine particular traits Many diseases (> 10000) are due to single genes 0
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Early Ideas about Heredity People knew that sperm and eggs transmitted information about traits Blending theory Problem: Would expect variation to disappear Variation in traits persists 0
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Gregor Mendel (1822-1884) 0 Monk in a monastery in late 1800s Strong background in plant breeding and mathematics Experimentation with pea plant inheritance took place in the monastery garden Found indirect but observable evidence of how parents transmit genes to offspring
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The Secrets of Mendel’s Success Important aspects of pea plants Pea flowers have male structures that produce pollen (male gametes) by meiosis Pea flowers have female structures that produce eggs (female gametes) by meiosis Pea flower petals enclose both male and female flower parts and prevent entry of pollen from another pea plant
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intact pea flower flower dissected to show reproductive structures
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Cross Fertilization of Parents 0 cross-fertilize pollen pollen Parental generation (P) True-breeding, purple-flowered plant True-breeding, white-flowered plant First-generation offspring (F 1 )
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This note was uploaded on 11/18/2010 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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Hrincevich+CH+12+student+outline - Patterns of Inheritance...

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