Invesitagtion 9.3

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Invesitagtion 9.3

  1. 1. The inherited information is located in the nucleus of every cell in the organism. The information is coded in the huge DNA molecule. The huge molecules are coiled into compact hot dog-shaped structures called chromosomes . Chromosomes are always present in almost identical pairs. Locations on chromosomes that affect features of organisms are called alleles . A gene is composed of 2 alleles . An organism's unique combination of genes is its genotype . The traits produced by an organism’s genes is its phenotype . Alleles that have more influence in determining traits are dominant alleles. Alleles that have less influence in determining traits are recessive alleles.
  2. 2. CHROMOSOME GENE NUCLEUS ALLELE
  3. 3. HOMOZYGOUS <ul><li>2 identical alleles </li></ul><ul><ul><li>Homozygous dominant – AA </li></ul></ul><ul><ul><li>Homozygous recessive - aa </li></ul></ul>
  4. 4. HETEROZYGOUS <ul><li>2 different alleles </li></ul><ul><ul><li>Aa </li></ul></ul><ul><ul><li>Phenotype is like dominant allele </li></ul></ul>
  5. 5. Stubby (l) Long (L) Nose Style Oval (r) Round (R) Eye Shape Blue (y) Yellow (Y) Body Color Roundpants (s) Squarepants (S) Body Shape Recessive Allele Dominant Allele Trait Yy RR ss Ss ll yy Rr LL Phenotype Genotype Phenotype Genotype
  6. 6. Stubby (l) Long (L) Nose Style Oval (r) Round (R) Eye Shape Blue (y) Yellow (Y) Body Color Roundpants (s) Squarepants (S) Body Shape Recessive Allele Dominant Allele Trait Blue Body Long nose Squarepants Oval Eyes Round eyes Roundpants Stubby Nose Yellow Body Phenotype Genotype Phenotype Genotype
  7. 7. <ul><li>Heterozygous round eyes </li></ul><ul><li>Homozygous long nose </li></ul><ul><li>Purebred squarepants </li></ul><ul><li>Hybrid yellow body </li></ul>Stubby (l) Long (L) Nose Style Oval (r) Round (R) Eye Shape Blue (y) Yellow (Y) Body Color Roundpants (s) Squarepants (S) Body Shape Recessive Allele Dominant Allele Trait
  8. 8. Sponge Bob gets married! <ul><li>SpongeBob’s Genotype </li></ul><ul><ul><li>SS </li></ul></ul><ul><ul><li>YY </li></ul></ul><ul><ul><li>RR </li></ul></ul><ul><ul><li>LL </li></ul></ul><ul><li>SpongeSusie’s Genotype </li></ul><ul><ul><li>ss </li></ul></ul><ul><ul><li>yy </li></ul></ul><ul><ul><li>rr </li></ul></ul><ul><ul><li>ll </li></ul></ul>
  9. 9. What will Junior look like? <ul><li>Junior gets ½ of his genes from mom and ½ from Dad </li></ul><ul><li>Dad is Homozygous Dominant for all traits </li></ul><ul><li>Mom is Homozygous Recessive for all traits </li></ul>
  10. 10. Dad Mom S Y R L s y r l
  11. 11. Reflection page 64 Record Junior’s phenotype and genotype

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