Explore BrainMass
Share

Explore BrainMass

    Genotype Symbols for Zucchinis

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    You cross two true breeding strains of zucchini, one with green fruit and the other with yellow. The F1 plants are all green , but when these are crossed, the F2 plants consists of 9 green and 7 yellow. How many genes are involved in determining the zucchini color? Using your own symbols, designate which genotypes yield green and which yield yellow zucchinis.

    © BrainMass Inc. brainmass.com October 9, 2019, 5:54 pm ad1c9bdddf
    https://brainmass.com/biology/genetics/genotype-symbols-zucchinis-71987

    Solution Preview

    Please see the attached file.

    genotypes
    ________________________________________
    You cross two true breeding strains of zucchini, one with green fruit and the other with yellow. The F1 plants are all green , but when these are crossed, the F2 plants consists of 9 green and 7 yellow. How many genes are involved in determining the zucchini color? Using your own symbols, designate which genotypes yield green and which yield yellow zucchinis.

    Solution:

    Gene Interaction -complementary action:

    One dominant allele of each of two genes is necessary to produce phenotype. Epistatic interactions of the genes will give a modified 9:7 ratio.

    Green zucchini is crossed with yellow Zucchini strains (True breed), so the genotype will be

    Green strain * Yellow strain ----- All are true breed
    GGYY ggyy

    GgYy --------------- Gametic condition of progeny (Green)---F1

    The cross between the F1 individuals will give 9:7 ratios in F2.

    GgYy * GgYy ----------F1 generation

    GY Gy gY gy
    GY GGYY GGYy GgYY GgYy
    Gy GGYy GGyy GgYy Ggyy
    gY GgYY GgYy ggYY ggYy
    gy GgYy Ggyy ggYy ggyy

    The F2 plants consists of 9 green and 7 yellow ...

    Solution Summary

    The expert examines genotype symbols for zucchinis. How many genes are involved in determining the zucchini color is determined.

    $2.19