Generally phenotypic variance = additive variance + dominance component
= 385+254 = 639 pounds.
Each summer, farmers compete to grow the largest pumpkin, which can weigh thousands of pounds. They...
Each summer, farmers compete to grow the largest pumpkin, which
can weigh thousands of pounds. They go to great lengths to help
their pumpkin grow, including using extra fertilizer, heaters on
cool spring days, and enclosures to reduce herbivory by
insects.
Suppose that botanists measure the variation in pumpkin weight
due to genetic composition and environmental factors. They measure
variation in standard deviations. Variation due to genetic
composition equals 254 pounds, whereas the variation due to
environmental factors equals 385...