- In performing dihybrid crosses between plants, Mendel observed a 9:3:3:1 ratio in the F2 offspring. This outcome is expected for two heterozygous pairs of alleles that segregate independently of each other

- The F1 offspring are heterozygous for both traits. Each has the genotype YyRr. The gametes of both parents of the F1 generation form by independent assortment. Each side of the Punnett square shows the four possible gametes that each parent can form. The 16 combinations possible in the F2 generation occur in a 9:3:3:1 phenotypic ratio. - During meiosis, homologous chromosomes segregate into different gametes. The diagram on the left shows how recombination occurs during meiosis. - In F1 individuals, cells contain homologous chromosomes for each of the two traits. A gamete can receive one of four different combinations of two sets of alleles, depending on how the chromosomes line up during metaphase. The four possibilities are YR, Yr, yR, and yr.

Which one of the following is true of the F2 generation produced from the parental cross of plants with the genotypes YYRR and yyrr?

- The phenotype ratio is 9:3:3:1

Which one of the following is the reason that a plant with the genotype YyRr can form four different gametes?

- Each of the different alleles Y or y can combine with each one of the different alleles R or r.

9.3.2 Independent Assortment: An Explanation Flashcards by Irina Soloshenko

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9.3.2 Independent Assortment: An Explanation Flashcards

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