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Anyone know how to interpret pedigrees?

Discussion in 'BBS Hangout' started by finalsbound, Dec 2, 2001.

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  1. finalsbound

    finalsbound Member

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    Pedigrees - - as in biology? It's the diagram showing the phenotypes of a trait for a group of organisms...

    It's so frustrating and confusing. All I really need to know is what the difference between the genotypes of autosomal dominant and autosomal recessive are.

    I've looked all over the net...can't find nothing. I find the definitions of auto dom and auto rec, but I may as well be reading Swahili. I really have to get this for midterms.

    If anyone recalls high school bio or happens to be an expert on Punnett Squares and Pedigrees (genetics), PLEASE help me out. I would be so thankful.

    :(
     
    #1 finalsbound, Dec 2, 2001
  2. Ottomaton

    Ottomaton Member
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    You get one gene from each parent.

    Autosomal dominant - If one of the 2 genes has the trait then you inherit it. So one of two positive genes = the condition is expressed.

    Autosomal recessive - You need both genes to make the trait active. Therefore you can carry the gene, and not express the condition.

    With two genes you have a 50-50 chance of getting the gene from each parent. Two parents, 4 genes, 4 combinations, 25% chance of getting each of the four combinations.
     
    #2 Ottomaton, Dec 2, 2001
  3. Severe Rockets Fan

    Severe Rockets Fan Takin it one stage at a time...

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    25% chance of getting each of the four combinations, thats if each parent was heterozygous...meaning they carry one dominant gene and one recessive gene.

    ex: A gene= dominant B gene=recessive

    Mom has A and B gene so she is AB genotype.
    Dad has A and B gene so he is also AB genotype.

    MOM
    A B
    A AA -25% AB-25%

    DAD

    B AB-25% BB-25%


    You can see that since the A is dominant over the B...A will be expressed 75% of the time in the offspring(this is the phenotype...or physical manifestation of the genotype.)

    Feel free to test anymore of my excellent:rolleyes: biology,genetics, health, or chemistry skills to your amusement!

    PS: I can't seem to get the punnett square to display correctly on the bbs, but if select reply with quotes than it will appear correctly.
     
    #3 Severe Rockets Fan, Dec 2, 2001
  4. kidrock8

    kidrock8 Member

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    I have itchy testes. What's wrong with me? ;)
     
    #4 kidrock8, Dec 2, 2001
  5. Severe Rockets Fan

    Severe Rockets Fan Takin it one stage at a time...

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    Tsk, tsk... KR8...you might think of investing a few pesos in condoms next time you go to boystown...

    This site might help you out a little...

    site of the itches!!!!!!! :D

    you might want to scroll down to the picture and view the horror!!:eek:
     
    #5 Severe Rockets Fan, Dec 2, 2001
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