Two genes $R$ and $Y$ which control seed shape and seed color are located on the same chromosome 20 $\mathrm{mC}$ apart. If you cross a plant with round/yellow seeds and a plant with wrinkled/green seeds, what is an expected chance of ontaining plants with wrinkled/green?

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∻Answer∻ ⚹ The expected chance of obtaining plants with wrinkled/green seeds from this cross is dependent on the recombination frequency between the two genes. ⚹ ∻Solution∻ ‖ a ⋮ Determine the parental genotypes: The plant with round/yellow seeds has the dominant alleles (RRYY), and the plant with wrinkled/green seeds has the recessive alleles (rryy). ‖ ‖ b ⋮ Calculate recombination frequency: The genes are located $20 \mathrm{mC}$ apart, which means there is a 20% chance of recombination between them. ‖ ‖ c ⋮ Determine gamete formation: Without recombination, the RRYY plant can only produce RY gametes, and the rryy plant can only produce ry gametes. With recombination, there is a 20% chance of producing Ry and rY gametes. ‖ ‖ d ⋮ Calculate the probability of wrinkled/green offspring: Since wrinkled/green is recessive, we need an ry gamete from both parents. The chance of an ry gamete from the RRYY parent is 10% (half of the recombination frequency), and it is 100% from the rryy parent. ‖ ‖ e ⋮ Use the product rule: The probability of an offspring being wrinkled/green is the product of the probabilities of receiving an ry gamete from each parent, which is $0.10 imes 1.00 = 0.10$ or 10%. ‖ ∻Key Concept∻ ⚹ Genetic linkage and recombination frequency ⚹ ∻Explanation∻ ⚹ The chance of obtaining wrinkled/green seeds from the cross is calculated based on the recombination frequency between the linked genes that control seed shape and color. ⚹◊What is the possible genotype of the parent plants for seed shape and color genes R and Y?⍭ Generate me a similar question◊

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