The Research on Two Test Methods of the Normal Distribution

The characteristic value of the normal parent population, such as the mean, the percentile, the percentage, the standard deviation and the coefficient of variation, are often tested in engineering. The Shapiro-Wilk test and Epps-Pulley test are established in this paper to get the characteristic value of the normal parent population, which can satisfy different practical requirements.

Inheritance of Twisted Pods in Common Bean (Phaseolus vulgaris L.)

Inheritance of a twisted pod characteristic, in which bean pods develop with a twist that sometimes exceeds 360°, was studied in crosses between round-podded green bean cultivars. In crosses between `Oregon 91G' (normal) or `Oregon 54' (normal) and OSU 5256-1 (twisted), the F1 was normal. Segregation in F2 populations, tested over a 4-year period and including 4,995 plants, clearly fit a 3 normal: 1 twisted ratio. All plants of backcrosses of the F, to the normal parent were normal and backcrosses of the F1 to the twisted parent segregated 1 normal: 1 twisted. The ratios observed indicated that twisted pods are conditioned by a single recessive gene for which the symbol tw is proposed.