A lumber company in East Texas is interested in the quantitative traits responsible for faster growth in trees. First they need to identify how many genes are involved in tree growth. The researchers of the company start by crossing trees that grow 6 inches per year (ipy) with trees that grow 24 ipy. From this cross trees that grow 15 ipy were obtained. If two 15 ipy trees are crossed, a binomial pattern is observed with 6 and 24 ipy trees occurring at a rate of 1/64.

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