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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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smmcmahon35 smmcmahon35
wrote...
11 years ago
4. You have two purple?flowered pea plants where purple is made by the P allele
while white flowers are made by the p allele. P is dominant over p. When you cross
these two plants you get a 3:1 ratio of purple:white flowered offspring. What are
the genotypes of the parents?
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oapplesauce Author
wrote...
#1
11 years ago
Both parents are Pp.

Pp x Pp makes

PP, Pp, Pp, pp

which are

purple, purple, purple, white phenotypically (3:1 purple:white)
wrote...
#2
11 years ago
Most likely both parents are heterozygous, that is Pp.  This type of cross (monohybrid) usually results in a 3:1 ratio (dominant to recessive) in the offspring in the F2 generation.
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