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13 August, 06:48

A dihybrid cross involves a study of inheritance patterns for organisms differing in two traits. Consider Mendel's experiments with pea plants. If we look at two traits of Mendel's peas, say seed shape and seed color, we will see that these two traits are inherited independently. A pea plant is heterozygous for both seed shape and seed color. S is the allele for the dominant, spherical shape characteristic; s is the allele for the recessive, dented shape characteristic. Y is the allele for the dominant, yellow color characteristic; y is the allele for the recessive, green color characteristic. Since this is a dihybrid cross, the genotype for each parent is SsYy. Can you determine which statements are correct regarding a dihybrid cross between SsYy X SsYy?

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  1. 13 August, 09:28
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    Cross between pea plants having genotype Ss Yy x Ss Yy

    SY Sy sY sy

    SY SSYY SSYy SsYY SsYy

    Sy SSYy SSyy SsYy Ssyy

    sY SsYY SsYy ssYY ssYy

    sy SsYy Ssyy ssYy ssyy

    Following are the facts which could be derive by looking at the punnett square:

    75% of the offspring will have spherical shape and yellow colour. 25% of the offspring will have dented shape and green colour. 56% of the off spring will have both spherical and yellow colour simultaneously. Only 6% of the spring will have dented shape and green colour simultaneously.
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