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MarieSoLoved

i dont understand this?

  • one year ago
  • one year ago

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  1. MarieSoLoved
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    13. Complete the monohybrid cross below the example using the directions for completing the Punnett Square in the reading and the example below. Then, list the genotypic ratio and describe the offspring. Be sure to remember that the capital letter is dominant. Example: A green pea plant (GG) is being crossed with a green pea plant (Gg) yellow is the recessive color. G G GG GG Gg Gg G genotype = 2 GG : 2 Gg : 0 gg g phenotype = 4 green pea plants : 0 yellow pea plants A green pea plant (Gg) is crossed with a yellow pea plant (gg). Complete the Punnett Square using THESE genotypes. Genotype: ___ GG : ____ Gg : ____ gg Phenotype: ____ green plants : ____ yellow plants

    • one year ago
  2. MarieSoLoved
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    they have bin boxes were the gs r .

    • one year ago
  3. MarieSoLoved
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    this is very comfussing

    • one year ago
  4. tafkas77
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    Oh, I can definitely help you with this. Let me just finish up with another student real quick, okay?

    • one year ago
  5. MarieSoLoved
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    ok thx :)

    • one year ago
  6. tafkas77
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    Okay, I am here. :) Please give me just a moment to type this stuff up. :)

    • one year ago
  7. tafkas77
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    So your box looks like this, right? Just a little neater... :) |dw:1363383193534:dw|

    • one year ago
  8. MarieSoLoved
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    yes

    • one year ago
  9. tafkas77
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    Okay. This is called a Punnett square. This will help you find out what genes an organism will have and what it will look like, based on the genes the parent gives it. Punnett squares usually test for one gene (a monohybrid cross), (in this case color) but they can test for more than one at the same time. Does this make sense? If so, I can move on.

    • one year ago
  10. MarieSoLoved
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    yes

    • one year ago
  11. tafkas77
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    Okay, great. :) To figure out a Punnett square, you have to realize that everything is based on probability (yes, math). To get a punnett square filled out, we have to multiply the alleles together to figure out gene probability. But don't worry - it's not too hard once you get the knack of it. :) Here's the first one: |dw:1363383633186:dw| Do you get this?

    • one year ago
  12. tafkas77
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    In that first box, I multiplied G * G to get GG

    • one year ago
  13. MarieSoLoved
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    |dw:1363383742031:dw|

    • one year ago
  14. tafkas77
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    Perfect! :D You got it! Now do you feel comfortable moving on to the next part?

    • one year ago
  15. MarieSoLoved
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    yes :)

    • one year ago
  16. tafkas77
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    great! Now we do the probability part. Looking at the cross, we can see that ALL of then contain the dominant allele, "G" That means that there is a 100? chance that the flowers will have the dominant color, and a zero percent chance that they will have the recessive (g) color. We can write the ratio like this: 2:2, since there IS a 50% chance that they could *have* the (g) in their genes, even though they won't use it. Does that make sense? |dw:1363384226703:dw|

    • one year ago
  17. MarieSoLoved
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    oh yes

    • one year ago
  18. MarieSoLoved
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    phenotype = 4 green pea plants : 0 yellow pea plants

    • one year ago
  19. tafkas77
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    Beautiful! :D

    • one year ago
  20. MarieSoLoved
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    :)

    • one year ago
  21. tafkas77
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    So, do you think you could do part 2 on your own, or would you still like me to help you?

    • one year ago
  22. MarieSoLoved
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    imma try on my own frist then c how i do .

    • one year ago
  23. tafkas77
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    Okay, great. :) Let me know if you get stuck or would like me to double-check anything. :)

    • one year ago
  24. MarieSoLoved
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    |dw:1363384842981:dw|

    • one year ago
  25. tafkas77
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    Wait a minute... A green pea plant (Gg) is crossed with a yellow pea plant (gg). Complete the Punnett Square using THESE genotypes. your square should look like this: |dw:1363385208090:dw|

    • one year ago
  26. MarieSoLoved
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    oh its crossed lol oh ok

    • one year ago
  27. MarieSoLoved
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    Gg.....gG gG.....gG

    • one year ago
  28. tafkas77
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    You're going to want to make sure the multiplication is right. Also, you may give your science teacher a heart attack if you put the dominant allele last! The dominant (capital letter) allele ALWAYS goes first. :) |dw:1363385814570:dw| Do you think you could get those now?

    • one year ago
  29. tafkas77
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    Also, if it helps, this is how you do the genes. So, let's the mommy flower is gg, and the daddy flower is Gg. Mommy goes on the side, and Daddy goes on top: |dw:1363386017181:dw| lol it sounds kind of sill to put it that way, but do you get it?

    • one year ago
  30. tafkas77
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    *silly

    • one year ago
  31. MarieSoLoved
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    so..it Gg..gg at the bottom

    • one year ago
  32. tafkas77
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    Perfect. :) And now... Genotype: ___ GG : ____ Gg : ____ gg Phenotype: ____ green plants : ____ yellow plants

    • one year ago
  33. MarieSoLoved
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    gg=0 Gg=2 gg=2 phenotyp:=2 yelow plant =2

    • one year ago
  34. MarieSoLoved
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    GG=0

    • one year ago
  35. MarieSoLoved
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    GG=0 Gg=2 gg=2

    • one year ago
  36. tafkas77
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    For the genotype....Not quite... Oh, never mind, I see you changed it. :) Great job! :D

    • one year ago
  37. MarieSoLoved
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    i did it right?

    • one year ago
  38. tafkas77
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    Yes! :D

    • one year ago
  39. MarieSoLoved
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    YAY thx so much:)

    • one year ago
  40. tafkas77
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    Oh, you're welcome! You did an awesome job. :) *gives extra medal*

    • one year ago
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