Several reports of polyembryony and polyploidy in the progeny of ms1 male-sterile soybeans have been made. Kenworthy et al. (1973) found 4% of 3485 seeds contained twin seedlings. Three triploids and one haploid were found among the twins.
Buss, G. R. and Autio, W. R.
"Research Notes : Observations of polyembryony and polyploidy in ms1 and
ms2 male-sterile soybean populations,"
Soybean Genetics Newsletter: Vol. 7
, Article 35.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol7/iss1/35