nikiseaholm
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. Based on your calculations of the probability of their child getting sickle cell disease, what is your advice? Show your calculations and explain your reasoning for your response. It may be helpful for you to draw pedigrees and possible Punnett squares for both Juan’s and Gina’s families.

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Quechua
Is there a picture with this question? It seems like there's background information which isn't being shown here.

Pedigrees are basically a map of alleles for family trees
 
                   ______Person1 -- Person2_____
                  I                I                  I                 I
        __Person3_   Person 4     Person5    _Person6___
       I                   I                          I            I                    I
   Person7 Person8                 Person9   Person10  Person11

And under everyone's name you write their alleles.

Punnett squares give the probability of someone having genes based on their parents' genes.
 
                             Parent1 (Aa)                   or                      Parent1 (aa)
 
Parent2 (AA)        AA      Aa                             Parent2 (Aa)     Aa      aa
                             AA      Aa                                                       aa      aa

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