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7th Grade Life Science

7th Grade Life Science
Chapter 5: Heredity
Section 1 Genetics

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Chapter 5 section 1 notes Chapter 5 section 1 notes Presentation Transcript

  • Chapter 5: HereditySection 1: Genetics
    Minersville Area School District
    Mr. Motuk
    Room 124
  • Genetics
    Heredity: The passing of traits from parent to offspring.
    Genes on chromosomes control the traits that show up in an organism.
    The different forms of a trait that a gene may have are alleles.
    During meiosis a pair of chromosomes separates and the alleles move into separate sex cells.
    Each sex cell now contains one allele for each trait.
    The study of how traits are inherited is genetics.
  • Gregor Mendel-The father of Genetics
    Mendel was the first to use mathematics of probability to explain heredity and to trace one trait for several generations.
    Hybrid: receives different genetic information for a trait from each parent.
    Dominant allele: covers up or dominates the other trait.
    Recessive allele: The trait seems to disappear, is covered up by the dominant allele.
    Probabilityhelps you predict the chance something will happen.
  • A Punnett Square can help predict what an offspring will look like.
    Upper case letters stand for dominant alleles.
    Lower case letters stand for recessive alleles.
    Y= Yellow
    y= Green
    Yy= Heterozygous
    yy= Homozygous
  • Genotype: The genetic makeup of an organism.
    Homozygous: An organism with two alleles for one trait that are the same. (YY or yy)
    Heterozygous: An organism with two alleles for one trait that are different. (Yy)
    Y= Yellow
    y= Green
    Yy= Heterozygous
    yy= Homozygous
  • Phenotype: The way an organism looks and behaves as a result of its genotype.
    YY and Yy would physically appear to be yellow, even though their genotype is different, they share the same phenotype.
    yy would physically appear to be green.
    Y= Yellow
    y= Green
    Yy= Heterozygous
    yy= Homozygous