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Thread: D. filiformis (all red) babies

  1. #9

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    Yes, and aren't ma babies purty little thangs!

    I'm thinking we might want to ask Brooks about this F2 deal.

    Here's what I cut and pasted from Jim's link-
    GEN Set A Using the Correct Symbols for Genotype and Phenotype
    GEN Set B Using Punnet Squares
    GEN Set C Predicting the Sex of Human Offspring Using Punnet Squares
    GEN Set D Autosomal Recessive Mode of Inheritance: Sickle Cell Anemia and Cystic Fibrosis
    GEN Set E Autosomal Dominant Mode of Inheritance: Huntington's Chorea and Tay-Sach's Syndrome
    GEN Set F Sex-linked Recessive Mode of Inheritance: Hemophilia and X-linked Color Blindness
    GEN Set G Predicting the Outcome of a Monohybrid Cross
    GEN Set H Predicting the Outcome of a Dihybrid Cross
    GEN Set I Making Your Own Dihybrid Cross

  2. #10
    Nepenthes Specialist nepenthes gracilis's Avatar
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    F1 generation punnett square:

    C C
    c Cc Cc

    c Cc Cc

    F2 generation:

    C c
    C CC cc

    c Cc cc

    So, only differences are that F1 offspring have dominant and recessive traits but will show dominance and F2 generation offspring will have 1 purebred for domant characteristic "C" 2 purebreds for recessive "C" and 1 dominant hybrid.

    The other difference is the F1 offspring were from purebred dominant and purebred recessive parents. F2 offspring were from both dominant hybrids.




  3. #11
    Moderator Joseph Clemens's Avatar
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    It looks very much like your seedlings could be Drosera filiformis (all red).
    ---------
    Concerning using an F2 designation for these plants:

    There are generally considered to be two sources of "hybrids":

    Intraspecific - involving plants of only one species, i.e. different clones or cultivars of plants considered to be the same species.

    Interspecific - involving plants of different species or genera (Intergeneric)
    --------
    Most often filial generation is used to refer to subsequent generations of plants sexually reproduced from the offspring of an initial hybrid designated F1 (First filial generation = progeny of Hybrid parent A x Hybrid parent B), interspecific hybrids.

    It is also possible that intraspecific crosses can be considered "hybrids", however, this is usually not done in horticulture. F2 and other filial generations are crosses between or selfings of F1 or following filial generations (i.e. F2, F3, F4, etc.), only F1 are the progeny of the initial hybrid cross, whether intraspecific or interspecific in origin. The genetic effects are similar for these two groups of “hybrids” of disparate origins, but the results can be dramatically dissimilar, intraspecific hybrids usually show very minor or certain easily predictable variation between progeny, especially in F2 and subsequent segregating populations. Hybrids of interspecific origins generally exhibit much greater variation in subsequent generations, F2 and later are especially divergent showing wide variations between offspring.



    Joseph Clemens
    Tucson, Arizona, U S A

  4. #12
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Is that what my punnett square deal thing shows Joe?

  5. #13

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    Mystery solved. The seeds I received were from open pollinated plants grown from genetically different seeds and should all come true as 'all reds'.

    They are not an F2.

  6. #14
    Moderator Joseph Clemens's Avatar
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    Dustin,
    Yes, the punnett square does indicate the basics of the concept, though the nuances of the realities of the relative uniformity of the F1 generation plants and the segregation of F2 and later generations can more easily be understood by actually experiencing the process.
    Joseph Clemens
    Tucson, Arizona, U S A

  7. #15
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Alright, thank you Joeseph [img]http://www.**********.com/iB_html/non-cgi/emoticons/new/smile.gif[/img]

  8. #16

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    I have a dusty BS in biology...more dusty than I though after trying to follow that thread, lol.

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