1. Mendel’s Work Chapter 3 Section 1 Pg 80-85 Gregor Mendel — the father of genetics

5. HOW CAN PEA PLANTS REPRODUCE? Self-pollination example

7. Self-pollination Pollen located on the stamen moves to pistil of the same plant

9. Cross Pollination example

10. Cross Pollination diagram

13. Mendel’s Experiments Mendel cross-pollinated purebred tall plants with purebred short plants and got…. Tall plant (breed) short plants P generation (think “parents”) F 1 generation ?

14. Mendel’s Experiments All TALL pea plants in the F 1 generation…. P generation (think “parents”) F 1 generation

15. So we could look at it like this too… P generation (cross pollinated) F1 generation (self-pollinated)

17. P generation (cross pollinated) F1 generation (self-pollinated) All tall F2 generation ¾ tall and ¼ short

22. EXAMPLES recessive dominant Recessive is the green box and dominant is the black box. Each of your parents has a pair of alleles that they can share. If they only give one… answer the following questions. ? ? ? dominant dominant recessive recessive recessive dominant

23. EXAMPLES recessive dominant Recessive is the green box and dominant is the black box. Each of your parents has a pair of alleles that they can share. If they only give one… answer the following questions. dominant dominant recessive recessive recessive dominant ? ? ? dominant

24. EXAMPLES recessive dominant Recessive is the green box and dominant is the black box. Each of your parents has a pair of alleles that they can share. If they only give one… answer the following questions. dominant dominant recessive recessive recessive dominant ? ? ? dominant dominant

25. EXAMPLES recessive dominant Recessive is the green box and dominant is the black box. Each of your parents has a pair of alleles that they can share. If they only give one… answer the following questions. dominant dominant recessive recessive recessive dominant ? ? ? dominant dominant recessive

29. Punnett Square .

30. 1 st take letters across…. . . . .

31. Then take letters down…

33. But what does it all mean? Represents 4 possible offspring ; the probability of children’s height.

34. Probability and Genetics

40. Punnett Square for 2 Hybrid plants to determine height of offspring. What letters should go on the top and to the side? You have to know what hybrid/ heterozygous means.

41. Punnett Square for 2 Hybrid plants to determine height of offspring. Right! But… What do we do now?

42. Punnett Square for 2 Hybrid plants to determine height of offspring. We put each allele in a spot on the top and left. It doesn’t matter if the t is above or below the T as long as they are both there.

43. Punnett Square for 2 Hybrid plants to determine height of offspring. Right! Now you move the alleles over…

44. Punnett Square for 2 Hybrid plants to determine height of offspring. Right! Now you move the alleles over…and DOWN!!!

46. But what does this square mean? First we have to learn about phenotype and genotypes.

48. What are the genotypes present?

49. Heterozygous/ Hybrid

50. Homozygous/ Purebred

52. What are the phenotypes present?

53. Which ones are tall plants?

54. Which ones are tall plants?

55. Which ones are short plants?

56. Which ones are short plants?

59. Yellow (yy) is recessive, Green (YY) is dominant

60. Yellow (yy) is recessive, Green (YY) is dominant

61. Y is green, y is yellow

62. Y is green, y is yellow

63. F=feathers; W-white B-black F F F F W W W B

64. F=feathers; W-white B-black F F F F F F F F F F F F W W W B W W W W W W W B B

65. What color are they? F F F F F F F F F F F F W W W B W W W W W W B B

66. R=round, r=wrinkled Y=yellow, y=green