Two pure breeding lines of corn with short and long seed length are crossed to p

Question

Two pure breeding lines of corn with short and long seed length are crossed to produce and Fl which is allowed to self fertilize to produce an F2. The distribution of the seed lengths for the F2 is shown in the graph on the left. This procedure is repeated with two other lines exhibiting short and tall plant height producing a distribution shown in the graph on the right. Y- number of seeds Y- number of plants X- F2 plant length X- F2 plant height Which one of these traits is likely to be quantitative? Why? what can be concludes about the genetic basis for each of these traits? With regard to plant height, the members of the F2 have the same genotype, why these plants show a range of heights rather than exactly the S3me height?

Explanation / Answer

a) Plant height is going to be the quantitative trait. b) Conclusions that can be made are that seed length follows the normal distribution curve in which medium seed length is the favored trait and the plant height has two maxima at the extremes demonstrating that very short plants and very tall plants are the favored traits. C) There is a range of heights because there are recessive genes that are not all demonstrated in the F2 group, but are demonstrated in the offspring of the F2 generation.

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