3. You perform a cross between two true-breedingstrains of zucchini. One has green fruit and the otherhas yellow fruit. The F1 plants are all green, butwhen these are crossed, the F2 plants consist of9 green : 7 yellow.a. Explain this result. What were the genotypes of thetwo parental strains?b. Indicate the phenotypes, with frequencies, of theprogeny of a testcross of the F1 plants.c. Describe the epistasis interactions observed.d. Suppose that the dominant alleles specify functional enzymes, and the recessive alleles are nonfunctional. Propose a biochemical pathway thatcould explain the gene interactions.e. Is it possible to cross two different pure-breedingyellow zucchini strains and obtain all green progeny? What would be the genotypes of the parentsand progeny? f. Assuming that wild-type zucchini are green, howwould you describe the phenomenon that occurredin the F1 of part (e)?
3. You perform a cross between two true-breeding
strains of zucchini. One has green fruit and the other
has yellow fruit. The F1 plants are all green, but
when these are crossed, the F2 plants consist of
9 green : 7 yellow.
a. Explain this result. What were the genotypes of the
two parental strains?
b. Indicate the
progeny of a testcross of the F1 plants.
c. Describe the epistasis interactions observed.
d. Suppose that the dominant alleles specify functional enzymes, and the recessive alleles are nonfunctional. Propose a biochemical pathway that
could explain the gene interactions.
e. Is it possible to cross two different pure-breeding
yellow zucchini strains and obtain all green progeny? What would be the genotypes of the parents
and progeny?
f. Assuming that wild-type zucchini are green, how
would you describe the phenomenon that occurred
in the F1 of part (e)?
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