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anonymous

  • one year ago

In pea plants, purple flowers (P) are dominant over white flowers (p) and tall stems (T) are dominant over short stems (t). Complete a dihybrid cross for parents with the genotypes: PpTT × ppTt and answer the following in complete sentences. Describe how you would set up a Punnett square for this cross. List the likelihood of each possible offspring genotype. List the likelihood of each possible offspring phenotype. @niels5x9

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  1. Rushwr
    • one year ago
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    what do u think the answer is ?

  2. anonymous
    • one year ago
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    @Rushwr I honestly don't know

  3. anonymous
    • one year ago
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    do you know what a punnet square is?

  4. anonymous
    • one year ago
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    @niels5x9 yes I do know what a punnet square is

  5. anonymous
    • one year ago
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    do you know how to make a punnet square of a dihybrid cross?

  6. anonymous
    • one year ago
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    I very vaguely know how to make it :(

  7. anonymous
    • one year ago
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    okey here is an example:

  8. shreehari499
    • one year ago
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    Cool @niels you are there... ,I'll leave

  9. anonymous
    • one year ago
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  10. anonymous
    • one year ago
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    Yeah I know what it looks like and stuff

  11. Rushwr
    • one year ago
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    @Devingee23 1st u would have to write down the gametes for each parent.

  12. anonymous
    • one year ago
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    It's pretty much just finding the probabilities that trips me up

  13. anonymous
    • one year ago
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    okey

  14. anonymous
    • one year ago
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    So it would be PT pT pT and pt?

  15. anonymous
    • one year ago
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    the number of times a genotype shows up in the square devided by the total number of squares is the probability of a certain genotype

  16. anonymous
    • one year ago
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    So I had it right? for that part @niels5x9

  17. anonymous
    • one year ago
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    o sorry no it is PT, PT, pT and pT. No pt

  18. Rushwr
    • one year ago
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    for PpTT parent it would be PT and pT for ppTt ------> pT and pt Now it's just the matter of punnet square

  19. anonymous
    • one year ago
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    because there is no little t in the starting genotype

  20. anonymous
    • one year ago
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    Okay so it is PT, PT, pT, and pT?

  21. anonymous
    • one year ago
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    oh hehe i think I understood you wrong I thought you meant on one side... you are right no problem

  22. anonymous
    • one year ago
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    so now what do I do?

  23. anonymous
    • one year ago
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    one side has PT and pT and the other has pT and pt

  24. anonymous
    • one year ago
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    |dw:1439997452539:dw|

  25. anonymous
    • one year ago
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    you draw a square like that and you fill up the square combining the 2 genotypes (so the top left one is PpTT)

  26. anonymous
    • one year ago
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    THe next one would be PpTt? @ niels5x9

  27. anonymous
    • one year ago
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    exactly!! great

  28. anonymous
    • one year ago
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    So now what we just fill in the rest of the square?

  29. anonymous
    • one year ago
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    exactly

  30. anonymous
    • one year ago
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    okay so all of them together are PpTT, PpTt, ppTt and ppTT?

  31. anonymous
    • one year ago
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    and then we can go on to determine the likelyhood of every genotype: the genotypes we have are: PpTT PpTt ppTT pptT the total number of genotypes is four and every genotype comes up one time. what do you think is the probability of every genotype showing up?

  32. anonymous
    • one year ago
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    yes is is

  33. anonymous
    • one year ago
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    25%?

  34. anonymous
    • one year ago
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    magnificent. now for the last question do you know what dominent and resisive means?

  35. anonymous
    • one year ago
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    I know for resecisve you have to have two of that one gene right? @niels5x9

  36. anonymous
    • one year ago
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    *dominant and ressesive exuse my english

  37. anonymous
    • one year ago
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    when you have two genes in a pair one can be dominant over another, like P is dominant over p. that means that if you have the genotype Pp your fenotype will be P and not p. p is the ressesive gene here. do you understand?

  38. anonymous
    • one year ago
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    KInd a

  39. anonymous
    • one year ago
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    @ niels5x9

  40. anonymous
    • one year ago
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    okey you have two genes P and p. some people have PP, they will have a fenotype P. some people have pp, they will have a fenotype p. But an organism can have only one fenotype so one should be dominant over another meaning that in case of Pp one should come out as the phenotype.

  41. Rushwr
    • one year ago
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    @Devingee23

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  42. anonymous
    • one year ago
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    So if it is Pp it will be purple but if it is pp it will be white?

  43. anonymous
    • one year ago
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    exactly

  44. Rushwr
    • one year ago
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    yeah PP also means that its purple.

  45. anonymous
    • one year ago
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    a lot of genetic disorders are also recessive and that means that somebody can have one of the genes for the disease but not notice it, but when they have children with another person with one gene of the disease their child might get the dissease.

  46. anonymous
    • one year ago
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    now what?

  47. anonymous
    • one year ago
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    so getting back to the exersize, you now work out what the fenotype of those 4 genotypes is

  48. anonymous
    • one year ago
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    How do I do that?

  49. anonymous
    • one year ago
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    okey so in the first one: PpTT in Pp P is dominant so phenotype: P in TT: T so the phenotype is: TP

  50. anonymous
    • one year ago
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    Well I know no matter what it will be a tall plant right?

  51. anonymous
    • one year ago
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    exactly!!

  52. anonymous
    • one year ago
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    So in the second one it will be purple and tall

  53. anonymous
    • one year ago
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    yes it will

  54. anonymous
    • one year ago
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    the third white and tall and in the last white and tall?

  55. anonymous
    • one year ago
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    yess certainly!!

  56. anonymous
    • one year ago
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    so really there is a 50% chance that it will be purple or white right?

  57. anonymous
    • one year ago
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    now what do you think is the next step in getting the chance in phenotype

  58. anonymous
    • one year ago
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    ?

  59. anonymous
    • one year ago
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    WOuld it be 50% @niels5x9

  60. anonymous
    • one year ago
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    @niels5x9 r u still there?

  61. anonymous
    • one year ago
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    sorry i was distracted yes it is!!

  62. anonymous
    • one year ago
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    SO are we done then?

  63. anonymous
    • one year ago
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    so now you have all the questions answered

  64. anonymous
    • one year ago
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    btw sorry @shreehari499 I just realised that this might have been more of your area of expertise.

  65. shreehari499
    • one year ago
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    Yeah it might be but you've done a good job..! Bravo!

  66. anonymous
    • one year ago
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    thanks!!

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