The following is a dihybrid cross: a pea plant with purple flowers and green pods is crossed with a pea plant with white flowers and yellow pods. The F1 plants all have purple flowers and green pods. On a piece of paper, draw the Punnett square depicting the selfing of the F1 plants to give the F2 plants. After the Punnett square is drawn, circle the squares representing the plants with purple flowers and yellow pods. Make sure to indicate what phenotypes the letters represent.
Added by Cole W.
Step 1
First, we need to assign the genotypes for the parent plants. Since purple flowers and green pods are dominant traits, we can represent them with "P" and "G", respectively. White flowers and yellow pods are recessive traits, so we can represent them with "p" and Show more…
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In a monohybrid cross, Mendel crossed true breeding pea plants with tall and dwarf stems. All the F1 plants had tall stems. In a di-hybrid cross, Mendel crossed peas with round seeds and yellow cotyledons with peas with wrinkled seeds and green cotyledons. All the F1 plants had round seeds with yellow cotyledons. Diagram both of the above crosses through the F2 generation using Punnett Square and write an interpretation of Mendel's findings.
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Mendel's dihybrid cross between two F1 pea plants with genotype YyRr (yellow and round seeds) would yield an F2 generation consisting of: - One quarter of the offspring with green and wrinkled seeds - All heterozygous genotypes like the parents - The majority of offspring with the yellow and round phenotype - Offspring with green and wrinkled seeds
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