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    Traits Traits Presentation Transcript

    • Traits :Inherited or Learned
    • Genetics Background:Gregor Mendel
      First man to understand genetics
      He studied inheritance in Pea Plants
      Experimented with cross pollination
      Discovered difference between dominant and recessive traits.
      http://en.wikipedia.org/wiki/Gregor_mendel
    • Dominant vs. Recessive
      Dominant trait always appears when present
      Recessive traits can recede in background
      Need two recessive alleles for trait to show
    • Gregor Mendel's Punnett Square
      Dominant Allele
      Recessive Allele
    • Homozygous vs. Heterozygous
      Homozygous = Two same alleles to make up a trait
      Ex. BB, bb
      Heterozygous = Two different alleles
      Ex. Bb
      www.en.wikipedia.org/wiki/genotypes
    • Genes
      Hold info to build / maintain cells
      Pass genetic info to offspring
      Make up a sequence of DNA
      www.en.wikipedia.org/wiki/Gene
    • Allele
      Make up part of a gene
      Make up trait of a organism
      Need two alleles to make up a trait
    • Genotype
      Full heredity information
      Determined fully by DNA
      Usually refers to specific character
      http://en.wikipedia.org/wiki/Genotype-phenotype_distinction
    • Phenotype
      Trait of organism
      Molecular, physical, behavioral
      Determined by genes as well as environment
      Also effected by evolution / natural selection
      Genotype + Environment = Phenotype
      www.wiki.org/wiki/phenotype
    • Natural Selection
      Evolution of an organism
      Change occurs to help organism survive / reproduce
      Changes phenotype not genotype
    • Inherited Traits
      Traits of a person determined by genes
      Not something that can be changed
      Ex. Eye color, skin color
    • Environmental or Acquired Traits
      Things that effect organism that are learned
      Not effected by genes of organism
      Ex. Language a person speaks or accent
    • Build your own Punnett Square
      Fill in the blanks
    • Review
      Which of the following is a example of a Inherited trait?
      Hair color
      Favorite food
      Accent
    • Review
      Fill in the blank
      Genotype + __________ = Phenotype
      Is the allele combination BB or bb an example of homozygous or heterozygous trait?
    • Review
      • Gregor Mendel studied cross-pollination in which type of plant?
      Rose
      Pea plant
      Corn
      • Are traits inherited, learned or a combination of both?