Genetics Review
Vocabulary Review <ul><li>trait </li></ul><ul><li>-A physical characteristic. </li></ul><ul><li>heredity </li></ul><ul><li...
Question  <ul><li>Which of the following is an example of a trait? </li></ul><ul><li>Bb </li></ul><ul><li>Talking loud </l...
Alleles <ul><li>Genes  are the factors that control  Traits. </li></ul><ul><li>Alleles  are the different forms of  Genes ...
Question  <ul><li>What is the term for factors that control traits? </li></ul><ul><li>Genes </li></ul><ul><li>Purebreds </...
Question  <ul><li>Which term refers to physical characteristics that are studied in genetics? </li></ul><ul><li>Traits </l...
DOMINANT and recessive Alleles <ul><li>A  dominant allele  is one whose  trait  always shows up in an organism when the  a...
Practice  <ul><li>R is the  dominant allele  for a one eyed monster. </li></ul><ul><li>r is the  recessive allele  for a m...
Monster Genetics <ul><li>Rr </li></ul><ul><li>How many eyes will our monster have????? </li></ul>01/21/12 Free template fr...
Monster Genetics <ul><li>RR  </li></ul><ul><li>How many eyes will our monster have?? </li></ul>01/21/12 Free template from...
Monster Genetics <ul><li>rr </li></ul><ul><li>How many eyes will our monster have?? </li></ul>01/21/12 Free template from ...
Question <ul><li>What does the notation TT mean to geneticists? </li></ul><ul><li>Two dominant alleles </li></ul><ul><li>T...
Codominance <ul><li>Some alleles are neither dominant or recessive. </li></ul><ul><li>Codominance  is when alleles are  ne...
What will Happen? <ul><li>You have two flowers, a white and a red, that are crossed. </li></ul><ul><li>The flowers are cod...
Phenotype <ul><li>Phenotype  is an organisms physical appearance or its visible traits. </li></ul><ul><li>Example: a pea p...
Genotype <ul><li>Genotype  is an organisms genetic makeup, or allele combination. </li></ul><ul><li>Example:  TT, Tt, tt <...
Describing genotypes <ul><li>Homozygous   (or Purebred)  is used to describe an organism that has two identical alleles fo...
Question <ul><li>Pick the answer that best describes “Aa”. </li></ul><ul><li>Homozygous </li></ul><ul><li>heterozygous </l...
Punnett Squares <ul><li>A punnett square is a chart that shows all possible combinations of alleles that  can  result from...
Punnett Example <ul><li>Yellow is dominant over Green. </li></ul><ul><li>What is the probability that the offspring will b...
Punnett Problems <ul><li>In purple people eaters, one-horn is dominant and no horns is recessive.  </li></ul><ul><li>Draw ...
Answer <ul><li>Hybrids have two different alleles for one trait.  </li></ul><ul><li>Hh is the hybrid in the example. </li>...
Punnett Problems <ul><li>In Bears the dominant allele for brown fur is R, black fur is recessive. </li></ul><ul><li>The fe...
Question <ul><li>What are the four possible phenotypes for the cubs? </li></ul><ul><li>A. RR, Rr </li></ul><ul><li>B. Rr, ...
Question <ul><li>What is the probability that the cub will have black fur? </li></ul><ul><li>A. 50% </li></ul><ul><li>B. 2...
Question <ul><li>What do you call one set of instructions for an inherited trait? </li></ul><ul><li>a. alleles </li></ul><...
Question <ul><li>Two forms of a gene, one from each parent, are called </li></ul><ul><li>a. alleles. </li></ul><ul><li>b. ...
Question <ul><li>What is a plant that has two dominant genes or two recessive genes called? </li></ul><ul><li>a. organism ...
Question <ul><li>The allele for freckles, F ,  is dominant among humans. If a woman with freckles (FF) and a man without f...
Question <ul><li>Part of a mouse’s tail is cut off as the mouse escapes from a cat. The mouse later reproduces. Which expl...
Question 01/21/12 Free template from www.brainybetty.com What is the genotype of the offspring represented in the upper le...
Question 01/21/12 Free template from www.brainybetty.com What is the genotype of the offspring represented in the upper le...
Question 01/21/12 Free template from www.brainybetty.com What is the ratio of  Rr  (purple-flowered plants) to  rr  (white...
Question <ul><li>Green seed color (G) is dominant to yellow seed color (g). If two heterozygous parents are crossed, what ...
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Genetics review and problems

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Genetics review and problems

  1. 1. Genetics Review
  2. 2. Vocabulary Review <ul><li>trait </li></ul><ul><li>-A physical characteristic. </li></ul><ul><li>heredity </li></ul><ul><li>-The passing of traits from </li></ul><ul><li>parents to offspring. </li></ul><ul><li>genetics </li></ul><ul><li>- The scientific study of </li></ul><ul><li>heredity. </li></ul>01/21/12 Free template from www.brainybetty.com
  3. 3. Question <ul><li>Which of the following is an example of a trait? </li></ul><ul><li>Bb </li></ul><ul><li>Talking loud </li></ul><ul><li>Brown eyes </li></ul><ul><li>Bleach blonde hair </li></ul>01/21/12 Free template from www.brainybetty.com
  4. 4. Alleles <ul><li>Genes are the factors that control Traits. </li></ul><ul><li>Alleles are the different forms of Genes . </li></ul><ul><li>Individual Alleles control the inheritance of Traits. </li></ul><ul><li>An offspring receives one allele from each parent. </li></ul>01/21/12 Free template from www.brainybetty.com
  5. 5. Question <ul><li>What is the term for factors that control traits? </li></ul><ul><li>Genes </li></ul><ul><li>Purebreds </li></ul><ul><li>Recessives </li></ul><ul><li>Parents </li></ul>01/21/12 Free template from www.brainybetty.com
  6. 6. Question <ul><li>Which term refers to physical characteristics that are studied in genetics? </li></ul><ul><li>Traits </li></ul><ul><li>Offspring </li></ul><ul><li>Generations </li></ul><ul><li>Hybrids </li></ul>01/21/12 Free template from www.brainybetty.com
  7. 7. DOMINANT and recessive Alleles <ul><li>A dominant allele is one whose trait always shows up in an organism when the allele is present. </li></ul><ul><li>- capital letter (AA, Aa) </li></ul><ul><li>A recessive allele is covered up when the dominant allele is present. </li></ul><ul><li>- lower case letter (aa) </li></ul>01/21/12 Free template from www.brainybetty.com
  8. 8. Practice <ul><li>R is the dominant allele for a one eyed monster. </li></ul><ul><li>r is the recessive allele for a monster with two eyes. </li></ul>01/21/12 Free template from www.brainybetty.com
  9. 9. Monster Genetics <ul><li>Rr </li></ul><ul><li>How many eyes will our monster have????? </li></ul>01/21/12 Free template from www.brainybetty.com
  10. 10. Monster Genetics <ul><li>RR </li></ul><ul><li>How many eyes will our monster have?? </li></ul>01/21/12 Free template from www.brainybetty.com
  11. 11. Monster Genetics <ul><li>rr </li></ul><ul><li>How many eyes will our monster have?? </li></ul>01/21/12 Free template from www.brainybetty.com
  12. 12. Question <ul><li>What does the notation TT mean to geneticists? </li></ul><ul><li>Two dominant alleles </li></ul><ul><li>Two recessive alleles </li></ul><ul><li>No dominant alleles </li></ul><ul><li>One dominant and on recessive allele </li></ul>01/21/12 Free template from www.brainybetty.com
  13. 13. Codominance <ul><li>Some alleles are neither dominant or recessive. </li></ul><ul><li>Codominance is when alleles are neither dominant or recessive , both alleles are expressed in the offspring. </li></ul>01/21/12 Free template from www.brainybetty.com
  14. 14. What will Happen? <ul><li>You have two flowers, a white and a red, that are crossed. </li></ul><ul><li>The flowers are codominant. </li></ul><ul><li>What color will their offspring be. </li></ul>01/21/12 Free template from www.brainybetty.com
  15. 15. Phenotype <ul><li>Phenotype is an organisms physical appearance or its visible traits. </li></ul><ul><li>Example: a pea plant stem height can be short or tall . </li></ul>01/21/12 Free template from www.brainybetty.com
  16. 16. Genotype <ul><li>Genotype is an organisms genetic makeup, or allele combination. </li></ul><ul><li>Example: TT, Tt, tt </li></ul>01/21/12 Free template from www.brainybetty.com
  17. 17. Describing genotypes <ul><li>Homozygous (or Purebred) is used to describe an organism that has two identical alleles for a trait. </li></ul><ul><li>Example: TT and tt </li></ul><ul><li>Heterozygous (or Hybrid) is used to describe an organism with two different alleles. </li></ul><ul><li>-Example: Tt </li></ul>01/21/12 Free template from www.brainybetty.com
  18. 18. Question <ul><li>Pick the answer that best describes “Aa”. </li></ul><ul><li>Homozygous </li></ul><ul><li>heterozygous </li></ul>01/21/12 Free template from www.brainybetty.com
  19. 19. Punnett Squares <ul><li>A punnett square is a chart that shows all possible combinations of alleles that can result from a genetic cross. </li></ul>01/21/12 Free template from www.brainybetty.com
  20. 20. Punnett Example <ul><li>Yellow is dominant over Green. </li></ul><ul><li>What is the probability that the offspring will be yellow? </li></ul><ul><li>100% </li></ul>01/21/12 Free template from www.brainybetty.com
  21. 21. Punnett Problems <ul><li>In purple people eaters, one-horn is dominant and no horns is recessive. </li></ul><ul><li>Draw a Punnet Square showing the cross of a purple people eater that is hybrid for horns, with a purple people eater that does not have horns. </li></ul>01/21/12 Free template from www.brainybetty.com
  22. 22. Answer <ul><li>Hybrids have two different alleles for one trait. </li></ul><ul><li>Hh is the hybrid in the example. </li></ul><ul><li>No horns would have to be hh because it is a recessive allele. </li></ul>01/21/12 Free template from www.brainybetty.com
  23. 23. Punnett Problems <ul><li>In Bears the dominant allele for brown fur is R, black fur is recessive. </li></ul><ul><li>The female bear is Rr and the male bear is rr. </li></ul>01/21/12 Free template from www.brainybetty.com
  24. 24. Question <ul><li>What are the four possible phenotypes for the cubs? </li></ul><ul><li>A. RR, Rr </li></ul><ul><li>B. Rr, rr </li></ul><ul><li>C. 2 brown, 2 black </li></ul><ul><li>D. 3 brown, 1 black </li></ul>01/21/12 Free template from www.brainybetty.com
  25. 25. Question <ul><li>What is the probability that the cub will have black fur? </li></ul><ul><li>A. 50% </li></ul><ul><li>B. 25% </li></ul><ul><li>C. 75% </li></ul><ul><li>D. 100% </li></ul>01/21/12 Free template from www.brainybetty.com
  26. 26. Question <ul><li>What do you call one set of instructions for an inherited trait? </li></ul><ul><li>a. alleles </li></ul><ul><li>b. phenotype </li></ul><ul><li>c. albinism </li></ul><ul><li>d. genes </li></ul>01/21/12 Free template from www.brainybetty.com
  27. 27. Question <ul><li>Two forms of a gene, one from each parent, are called </li></ul><ul><li>a. alleles. </li></ul><ul><li>b. phenotypes. </li></ul><ul><li>c. albinism. </li></ul><ul><li>d. genes. </li></ul>01/21/12 Free template from www.brainybetty.com
  28. 28. Question <ul><li>What is a plant that has two dominant genes or two recessive genes called? </li></ul><ul><li>a. organism </li></ul><ul><li>b. genotype </li></ul><ul><li>c. homozygous </li></ul><ul><li>d. heterozygous </li></ul>01/21/12 Free template from www.brainybetty.com
  29. 29. Question <ul><li>The allele for freckles, F , is dominant among humans. If a woman with freckles (FF) and a man without freckles (ff) have children, what are the possible genotypes of the children? </li></ul><ul><li>A. Ff </li></ul><ul><li>B. FF, Ff, ff </li></ul><ul><li>C. Ff, ff </li></ul><ul><li>D. ff </li></ul>01/21/12 Free template from www.brainybetty.com
  30. 30. Question <ul><li>Part of a mouse’s tail is cut off as the mouse escapes from a cat. The mouse later reproduces. Which explanation best describes why the mouse’s offspring have long tails? </li></ul><ul><li>A. Long tails are a dominant trait. </li></ul><ul><li>B. Short tails do not appear in the first generation or the second generation. </li></ul><ul><li>C. Cutting the tail of the mouse changed its genes. </li></ul><ul><li>D. Cutting the tail of the mouse did not change its genes. </li></ul>01/21/12 Free template from www.brainybetty.com
  31. 31. Question 01/21/12 Free template from www.brainybetty.com What is the genotype of the offspring represented in the upper left-hand box of the Punnett square? A RR B Rr C rr D rrr
  32. 32. Question 01/21/12 Free template from www.brainybetty.com What is the genotype of the offspring represented in the upper left-hand box of the Punnett square? A RR B Rr C rr D rrr
  33. 33. Question 01/21/12 Free template from www.brainybetty.com What is the ratio of Rr (purple-flowered plants) to rr (white-flowered plants) in the offspring? A 1:3 B 2:2 C 3:1 D 4:0
  34. 34. Question <ul><li>Green seed color (G) is dominant to yellow seed color (g). If two heterozygous parents are crossed, what will be the resulting genotypes of the offspring? </li></ul><ul><li>GG, Gg, gg </li></ul><ul><li>Gg, gg </li></ul><ul><li>GG, Gg </li></ul><ul><li>gg, GG </li></ul>01/21/12 Free template from www.brainybetty.com

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