hardy weinberg

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When finding the dominant phenotype why do you add P^2 with 2pq? Why is the heterozygous also dominant? Is this just a rule you need to know?

Thanks

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When finding the dominant phenotype why do you add P^2 with 2pq? Why is the heterozygous also dominant? Is this just a rule you need to know?

Thanks
Let me ask you this, is a person with Qq show the traits of Q? the answer is yes. So clearly, heterozygous person shows dominant traits.
 
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By the rules of complete dominance in which the dominant allele will be expressed over the recessive, an organism with a heterozygous genotype will express dominant traits.

Ex: If P is for purple flowers and p is for white flowers, Pp will demonstrate dominant color purple.
 
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