In pea plants, the appearance of flowers along the main stem is a dominant phenotype called "axial" and is controlled by an allele . The recessive phenotype, produced by an allele t, has flowers only at the end of the stem and is called "terminal." Pod form displays a dominant phenotype "inflated," controlled by an allele , and a recessive "constricted" form, produced by the allele. A pure-breeding axial, constricted plant is crossed to one that is pure-breeding terminal, inflated.

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Part A

The F1 progeny of this cross are allowed to self-fertilize. What is the expected phenotypic distribution among the F2 progeny? Express your answer as four numbers separated by colons:

axial inflated : axial constricted : terminal inflated : terminal constricted =

Part B

All of the F2 progeny with terminal flowers are saved and allowed to self-fertilize to produce a partial F3 generation. What is the expected phenotypic distribution among these F3 plants? Express your answer as two numbers separated by colons:

terminal inflated : terminal constricted =  

Part C

If an F1 plant from the initial cross described above is crossed to a plant that is terminal, constricted, what is the expected distribution among the resulting progeny?Express your answer as four numbers separated by colons:

axial inflated : axial constricted : terminal inflated : terminal constricted = 

Part D

If the plants with terminal flowers produced by the cross in part (c) are saved and allowed to self-fertilize, what is the expected phenotypic distribution among the progeny? Express your answer as two numbers separated by colons:

terminal inflated : terminal constricted =

asked Jan 26, 2013 in Genetics by anonymous
    

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