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11 May, 05:06

In pea plants, red flower color is dominant to white. Yellow seed color is dominant to green and inflated pods are dominant to constricted pods. Pollen is taken from a plant that is heterozygous for all three traits and used to fertilize flowers from a plant that is heterozygous for flower color, homozygous dominant for seed color and homozygous recessive pod shape. What are the predicted phenotypes and ratios for offspring from this mating?

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  1. 11 May, 05:14
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    The predicted phenotypes are:

    Individuals with red flowers, yellow seeds and inflated pods. 37,5%

    Individuals with red flowers, yellow seeds and constricted pods. 37,5%

    Individuals with white flowers, yellow seeds and inflated pods. 12,5%

    Individuals with white flowers, yellow seeds and constricted pods. 12,5%

    Explanation:

    In these types of exercises you must build a Punnett square, and write the possible allele combinations for each gene, which parents can grant. In this case the male (pollen) can grant 8 possible combinations and the female 2 possible combinations.

    The alleles you find in this Punnett square are:

    A: Red flowers.

    A: White flowers.

    Y: Yellow seeds.

    and: Green seeds.

    I: Inflated pods.

    i: Constricted pods.

    In the phenotypes resulting from the offspring (boxed with colors) the dominant alleles will always be shown in the phenotype dominating the recessive ones.
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