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Genetics Basics


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Genetics Basics

  1. 1. Genetics <ul><li>Open another window and go to </li></ul><ul><ul><li>Find biology </li></ul></ul><ul><ul><ul><li>Click “quizlet genetics vocabulary.” </li></ul></ul></ul><ul><ul><ul><li>Do - familiarize – learn 100% – space race (10,000pts) - test 100% </li></ul></ul></ul>
  2. 2. Genetics Write black
  3. 3. Gregor Mendel <ul><li>Father of Genetics </li></ul><ul><li>Worked with peas </li></ul><ul><li>Studied heredity – offspring inherit traits from parents </li></ul>Write black
  4. 4. Genes and terminology <ul><li>Gene – sequence of DNA that codes for a protein and thus determines a trait </li></ul><ul><ul><li>A – adenine </li></ul></ul><ul><ul><li>G – guanine </li></ul></ul><ul><ul><li>T – thymine </li></ul></ul><ul><ul><li>C – cytosine </li></ul></ul><ul><li>ACACGCGCGCGCGAACTACAGATAA </li></ul><ul><ul><li>This animal is hairy </li></ul></ul>Write black
  5. 5. Con. <ul><li>Alleles – one of a number of different forms of a gene </li></ul><ul><ul><li>Dominant (T) and recessive (t) </li></ul></ul><ul><ul><li>T and t represent two different alleles </li></ul></ul><ul><ul><li>If a trait is expressed and the alleles are the same it is homozygous </li></ul></ul><ul><ul><ul><li>TT = homozygous dominant </li></ul></ul></ul><ul><ul><ul><li>tt = homozygous recessive </li></ul></ul></ul><ul><ul><ul><li>Tt = heterozygous dominant </li></ul></ul></ul>Write black
  6. 6. Con. <ul><li>Phenotype is the outward expression of the genes. Physical characteristics </li></ul><ul><li>Genotype is the genes themselves </li></ul><ul><li>T = tall over 5’2” t = short under 5’2” </li></ul><ul><li>Example – Cross Tt and Tt in a Punnett square </li></ul>Write black
  7. 7. Review <ul><li>Mendel </li></ul><ul><li>Gene </li></ul><ul><li>Allele </li></ul><ul><li>Phenotype </li></ul>