2 24 Intro To Punnet Squares
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2 24 Intro To Punnet Squares

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    2 24 Intro To Punnet Squares 2 24 Intro To Punnet Squares Presentation Transcript

    • Launch
      • Correct the following false statements to make them true statements:
      • “ We write the haploid number as 4N”
      • “ Somatic cells and sex cells both undergo meiosis”
      • “ An example of a somatic cell is eggs”
      • “ An example of a germline cell is a brain cell”
    • Mendelian Genetics
    • Mendelian Genetics
      • Mendelian Genetics is the study of how traits are passed down from parents to offspring
    • Father of Genetics
      • Gregor Mendel is considered to be the
      • father of genetics
      • Gregor Mendel was an Austrian priest who made a lot of scientific discoveries about inheritance by studying peas and flowers.
    • Inheritance
      • Inheritance is the passing of traits from parents to offspring
    • Gene
      • A certain portion of DNA that codes for a specific protein
        • Ex: Genes for hair color, eye color, hormones, etc.
      • The rest of DNA is known as junk DNA.
    • Gene
      • Some traits are complex and require multiple genes
        • Skin color
    • Allele
      • Alleles are different forms of one gene.
        • Example:
          • The gene is hair color
          • The alleles might be brown hair, blonde hair, red hair, black hair, etc.
    • Genotype
      • The genotype is the way we describe the genetic make-up of an individual.
      • The genotype always consists of two letters: one for the allele from the mother, one for the allele from the father
        • Rr, SS, dd
    • Phenotype
      • The phenotype is the physical appearance that is made as the result of an individual’s genotype.
        • The things we see!
    • Genotype
      • Alleles are either dominant or recessive .
      • When a dominant allele is present, you only see the dominant phenotype even if the recessive allele is also present.
      • Hh
    • Dominant
      • Dominant genes only require one allele to express the dominant phenotype.
      • Dominant alleles are represented in genotypes with a capital letter.
      • Examples: HH, Dd, SS, Tt,
    • Recessive
      • Recessive genes require both alleles to express the recessive phenotype.
      • Recessive alleles are represented in genotypes with a lower case letter.
      • Examples: hh, dd, ss, tt,
    • Heterozygous
      • Individuals are heterozygous for a gene when they receive a dominant allele from one parent and a recessive allele from another parent.
        • Rr, Ss, Tt, Uu
    • Think-Pair-Share
      • Why do individuals heterozygous for a gene always produce a dominant phenotype?
    • Homozygous
      • Individuals are homozygous when they receive the same allele from both parents
        • Individuals are either homozygous dominant or homozygous recessive
          • RR, rr, SS, ss
    • Exit Slip
      • __________ do mitosis, __________ do meiosis
        • A. brains cells, heart cells
        • B. eggs, sperm
        • C. sperm, brain cells
        • D. brain cells, eggs
      • If an individual is “Hh” for a trait
        • Is this individual homozygous or heterzygous?
        • Have a dominant or recessive trait?