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Genetics QUIZ. GENETIC CORN LAB Carolina Biologica: 3 Preparing the seeds - FILE Carolina Biological: 2 Harvesting Carolina Biological 1: Pollination.

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Presentation on theme: "Genetics QUIZ. GENETIC CORN LAB Carolina Biologica: 3 Preparing the seeds - FILE Carolina Biological: 2 Harvesting Carolina Biological 1: Pollination."— Presentation transcript:

1 Genetics QUIZ

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3 GENETIC CORN LAB

4 Carolina Biologica: 3 Preparing the seeds - FILE Carolina Biological: 2 Harvesting Carolina Biological 1: Pollination Carolina Biological 1: Pollination FILE Carolina Biological: 2 Harvesting FILE Carolina Biologica: 3 Preparing the seeds

5 Silk (flower with eggs) Where do seeds come from? Tassel (flower with pollen)

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9 1.Describe the corn plants – at least three facts. 2.Ask at least one question. 3.Write two characteristics – one inherited, one that is not. 4.Two traits? Phenotypes? 6.Letters? 5.Which phenotypes are recessive and which – dominant? Explain. 7. COUNT each phenotype. Ratio. 8. Compare to Mendel’s predictions.

10 Trait 1: Trait 2: Phenoty pe 1: Phenot ype 2: Phenoty pe 1: Phenoty pe 2: Num ber of plant s: Rati o:

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12 Chlorophyll A Chlorophyll-binding protein

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15 No GA effect GA effect Gibberrelinic acid (GA) DwarfNormal

16 LAB: Answer questions 1-8, including your counts.

17 1.Describe the corn plants – at least three facts. 2.Ask at least one question. 3.Write two characteristics – one inherited, one that is not. 4.Two traits? Phenotypes? 6.Letters? 5.Which phenotypes are recessive and which – dominant? Explain. 7. COUNT each phenotype. Ratio. 8. Compare to Mendel’s predictions.

18 Two Tall Green corn plants were crossed, giving rise to the seeds we had planted. 1.Looking at the seedlings, what must be the genotypes of the parents? (Choose the letters) 2.What would be the expected phenotypic ratio in the children? Explain. Journal:

19 G - Green g - White T – Tall, t – Dwarf Tt T t TTTt tt G g G g GG Gg gg For each trait, the phenotypic ratio is ¾ : ¼ Green: White ¾ : ¼ Tall: Dwarf ¾ : ¼ Is this what your counts show?

20 NOTES

21 “Allele pairs separate independently of each other during gamete formation by meiosis.” When does this law work? Only when the genes are situated on different chromosomes (not linked) Notes: Mendel’s Law of Independent Assortment Looking at two traits at a time

22 Assort Independently: A and C; B and C Do NOT assort Independently: A and B - they are on the same chromosome. This will affect the ratios between the phenotypes in F2 generation…

23 Are the two genes, for color and for height sitting on the same chromosome? If they are NOT, and they assort independently, then we can allow ourselves to: A.List ALL the possible gamete combinations in the punnet sq. B.Multiply individual probabilities.

24 GgTt x GgTt Possible phenotype Combinations: Green, Tall Green, Dwarf White, Tall White, Dwarf If the two traits are inherited independently, what are their expected ratios? G - Green g - White T – Tall, t – Dwarf

25 A. PUNNET SQUARE

26 For the following crosses, List the possible gametes of each parent. Then draw the punnet square for the two traits. 1.YySs x YySs 2.YYss x YySS G = Green, g = White plant T = Tall, t = Dwarf GgTt x GgTt All the possible gametes: GTGtgTgt GT Gt gT gt Step 2: Placing gametes in the punnet square For Corn….

27 For the following crosses, List the possible gametes of each parent. Then draw the punnet square for the two traits. 1.YySs x YySs 2.YYss x YySS YySs x YySs GTGtgTgt GT Gt gT gt GGTT GGTs GgTT GgTt GGTt GGtt GgTt Ggtt GgTT GgTt ggTT ggTt GgTt Ggtt ggTt ggtt What is the expected phenotypic outcome?

28 Expected phenotypic outcome: Green Tall Green Dwarf White Tall White Dwarf 9/163/16 1/16::: Now, compare these predictions to your actual counts!

29 B. MULTIPLYING PROBABILITIES

30 G - Green g - White T – Tall, t – Dwarf Tt T t TTTt tt G g G g GG Gg gg For each trait, the phenotypic ratio is ¾ : ¼ Green: White ¾ : ¼ Tall: Dwarf ¾ : ¼ Is this what your counts show?

31 Are the probabilities of the combined phenotypes, the products of the individual chances? Green, Tall Green, Dwarf White, Tall White, Dwarf ¾ x ¾ = 9/16 ¾ x ¼ = 3/16 ¼ x ¾ = 3/16 ¼ x ¼ = 1/ Is this what we got in our counts?

32 Expected phenotypic outcome: Green Tall Green Dwarf White Tall White Dwarf 9/163/16 1/16::: Now, compare these predictions to your actual counts!

33 1.Write the possible gametes in the following parent: AaBbCc (notice: one allele per gamete for each genes: ABC, Abc, …) 2. Repeat your answer considering the position of the genes on the chromosomes:

34 Assort Independently: A and C; B and C Do NOT assort Independently: A and B - they are on the same chromosome. This will affect the ratios between the phenotypes in F2 generation…

35 Assignment: Answer ALL question in the packet up to 15. For extra 40 points – continue to question 19! (For number 12 – draw the chart, calculate the ratios, by turning the largest count into 9, and dividing the rest by the same factor).

36 ACTUAL COUNTS?

37 Draw the following chart for the F2 generation, count the plants and fill in the numbers you got: Green Tall Green Dwarf White Tall White Dwarf

38 Draw the following chart for the F2 generation, count the plants and fill in the numbers you got (2 classes): Green Tall Green Dwarf White Tall White Dwarf / 9.11= 9

39 Complete Lab – Part TWO Part THREE, looking at the REAL gene mapping on the corn chromosomes, can be done at home, for extra credit!

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