pomopsis aggregata site Pure Pure cross Back Cross 0 Hybrid site 0 0.25 0.50 0.7

Question

pomopsis aggregata site Pure Pure cross Back Cross 0 Hybrid site 0 0.25 0.50 0.75 1.00 Proportion of genes from tenuituba It shows the fitnesses of various kinds of hybrids of two plant species of the genus lpomopsis, aggregata and tenuituba. These two species form several hybrid zones in Colorado. The researchers made F1 hybrids, backcrosses, and F2s between the two species. Thus they had a range of plants ranging from 0 to 100% tenuituba genes. They then planted this array of different genotypes in 1) an area with only aggregata, and 2) and are in the middle of a hybrid zone between the two species. The results, with fitnesses on the Y axis, are shown in the figure; note the use of regression to show the slope of fitness on fraction of tenuituba genes In which area were there fitness differences among the different genotypes? Select one a. the area of the hypotenuse b. the area of a circle C. the area with only aggregata d. the area around Denver ethe area within the hybrid zone

Explanation / Answer

Answer: Option C is correct.

Explanation: From the second graph, it is clear that there is no fitness advantage in the hybrid zone. Plants with varying genotypes show similar fitness values. However, when plants with different genotypes are planted in the aggregata site, there is a huge variation in the fitness value among different genotypes (See graph 1).

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