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In pea plants purple flowers are dominant over white flowers. If you cross a heterozygous purple flower plant with a white flower plant what are the expected genotypes and phenotypes of the offspring? Report your answer for both genotype and phenotype stating the fractions of each that are expected

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The first step is to write out the parents genotypes. In this case, it tells you that the purple parent is heterozygous, meaning that it has one allele of each type. So Pp. Furthermore, it tells you that purple is dominant over white, so if the white parent had even one dominant allele it would be purple. Its phenotype is pp. Those are what you should use when you set up your Punnet Square. Hopefully that is enough to get you started. :)
Can you help me with the fraction part? o:
Before you can get to the fractions, you have to do a Punnet square. Have you already done that part on your own or shall we work through it here?

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It would be Pp and ww so it would be like.. so would it be like 50/50?
sorry I drew it but it didnt come out on the other one
That is exactly right. The only slightly, erm, irregular thing about it is that you have assigned a big P for the dominant purple allele and a lower case w for the recessive white allele. Tradition has it that the alleles are both the same letter but the dominant one is capital P and the recessive one is lowercase p. That is just a matter of naming. And the ratios are quite correct. Using your notation, the 1/2 Pw offspring are heterozygous - they have a dominant allele, P, so they will be purple. While the 1/2 pw offspring have only the recessive allele, so they will all be white.
Okay, thank you very much!
Glad to be helpful.
What about the genotype part? or is it the same thing?

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