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# Why do we always have to start with q^2 for Hardy-Weinberg

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Why do we always have to start with q^2 for Hardy-Weinberg?
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This equation is used to look at genetics in biology. The p stands for the probability of having the "A" allelle (the dominant gene) while the q stands for the probability of having the "a" allelle (the recessive gene).

To answer your specific question, there are three possibilities of the genes that can be passed, the AA (which would be shown as p*p or p^2 in our equation), the Aa (which is shown by the p*q in the middle of the equation) and the aa (which is shown by the q*q or q^2 at the end of the equation).

CLICK HERE for another resource that you can use to further explain the entire equation.

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Customer: replied 4 years ago.

Greg,

Another question. Have the p and q's answers ever come out the same?

I know that the P=dominant-long term and Q=recessive-short term disease/traits.

Please let me know ASAP!

Thanks.

Rose

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Customer: replied 4 years ago.

Thank you. I appreciate it.

Rose

No problem Rose.

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