Punnett\'s square analysis for the parental cross r Rr Rr 9) If we used the abov

Question

Punnett's square analysis for the parental cross r Rr Rr 9) If we used the above offspring (F1) in a new cross, what would be the genotypes and phenotypes of the offspring of the Fz generation? 10) What is the genotypic ratio of the F2 generation? 11) What is the phenotypic ratio of the F2 generation? 12) What would be the genotypic and phenotypic ratios of offspring from a cross between a homozygous recessive parent (r r) and a heterozygous parent (R r)? 13) The ear of corn in front of you (#1) is from the F2 generation of a controlled cross. Using what you now know about Punnett's squares, monohybrid crosses, and phenotypic/genotypic ratios, how could you determine the genotype and phenotype of the Fi parents? 14) What is the phenotype and genotype of the Fi parents using your method from the above question? 15) what is the phenotype and genotype of the F1 parents of corn #2? B. Mendel's Law of Independent Assortment: When the alleles of two different genes separate during meiosis, they do so independently of one another unless the genes are located on the same chromosome (linked). This is the principle of independent assortment. Mendel discovered independent assortment by performing dihybrid crosses in the pea plant. We will examine dihybrid crosses in maize. Consider the genes for kernel color and kernel composition in maize. Seed color gene R allele, dominant, for purple kernels r allele, for yellow kernels Seed composition gene T allele, dominant for smooth (starchy) kernels t allele, for wrinkled (sweet) kernels In the P generation, a homozygous plant with purple, smooth kernels was crossed with a plant having yellow wrinkled kernels. The F, plants were allowed to fertilize themselves. According to the principle of independent assortment, the color gene and the seed shape gene should not affect one another; that is, they should behave independently.

Explanation / Answer

Parental generation genotype RR(Red kernel) x rr(White kernel)

F1 offsprings genotype Rr (all pink)- though only one dominant allele is present

when we self-cross the F1 offsprings

F2 generation possible offsprings

R r R RR - red  kernel Rr - Pink  kernel r Rr - Pink  kernel rr - white kernel

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