L 375 T3 (3 points) Suppose two inbred (true-breeding)lines of peas are crossed
ID: 219954 • Letter: L
Question
L 375 T3 (3 points) Suppose two inbred (true-breeding)lines of peas are crossed to make an F1 generation, and the F1 are then allowed to cross or self-pollenate F2 generation. Further suppose that one of the two parent lines was unusually short the other unusually tall. As expected, the F2 population has roughly the same average height as the two parental populations combined, but with a wider range of values. Finally, suppose that the F2 generation contains 200 individuals but none of them fall into the same height range as either original parent. In other words, the tallest F2 are not as tall as the tall parent, and the shortest F2 are not as short as the shortest parent. Based on this information, what is the MINIMUM number of loci controlling the variance in height in the F2 population? to produce an Justify your answer. How can you tell that there must be at least this many loci? Because there are ony tuD trau ts, tall or (2 points) VGE is a component of phenotypic variance (Vp). What does the symbol VGE stand for and what does this mean (what causes this factor)? EnvironimenExplanation / Answer
1. The minimum number of loci controlled the variance is 4
2. (1/4)n = (1/4)4 = 1/256
3. VGE = Variance due to interactions between genes and environment
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