gene combo. gene combo – 2-5-15 key question: how do genes determine a trait? what happens to the...
TRANSCRIPT
- Slide 1
- Gene Combo
- Slide 2
- Gene Combo 2-5-15 Key Question: How do genes determine a trait? What happens to the parents gene that doesnt show? Initial thoughts:
- Slide 3
- Evidence: Poppy & Skye Generation 1: Skye (blue tail) Poppy (orange tail) TTtt Homozygous = 2 copies of the same gene Blue, or T, is dominant over Orange, or little t. Little t is recessive. What is Skyes phenotype? What is Skyes genotype?
- Slide 4
- Generation 2 (Skye & Poppys Offspring) OceanLucyTt Heterozygous = 2 different genes What is their genotype? What is the phenotype?
- Slide 5
- Evidence 2: Coin Toss Model Paste the chart into your notebook Use the coin to represent whether Ocean & Lucys offspring get T or t. Heads = T Tails = t Remember: TT = blue tT or Tt = blue tt = orange
- Slide 6
- Graph your results
- Slide 7
- Analysis Questions 1.What is the ratio of blue-tailed to orange-tailed critter pups? a)Ration = Number of blue tailed offspring Number of orange-tailed offspring b)Round this to the nearest whole number. Then express as a ration by writing it like this: _______ : 1 c)Express this ration as a pair of fractions, so that you can use them to complete the following sentence: About _____ of the offspring have blue tails, and about _____ of the offspring have orange tails. d)Why isnt the ration 1:1 or half blue half orange?
- Slide 8
- Analysis Questions contd 2.You and your partner are about to toss 2 coins 100 times. Predict how many times the outcome would be: a)Heads-heads b)Heads-tails c)Tails-heads d)Tails-tails 3.Look back at the Creature Features lesson. Do the results of the coin tossing model match the Generation Three critter data? Explain.
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- Summary What did you think about how genes determine a trait before? What did you learn from your evidence about how genes determine a trait? What are some further thoughts or questions you have about how genes determine a trait?
- Slide 10
- Reflection Write a letter to the Zoo explaining your findings about tail color traits and their chances.
- Slide 11
- Big Idea