Abstract
The genetic control of breeding system in a population of grain amaranth is described here by the estimates of outcrossing rate variation among individuals and their response to mass selection. In the first generation (S0), a single morphological marker locus(R/r) controlling plant pigmentation was used for the estimation of outcrossing rate. A mixture of genotypes RR (red) and rr (green) mixed in equal proportions was grown and all rr plants were progeny-tested for estimating the outcrossing rate (t), using the relationship t=H/p, where H = proportion of heterozygotes (Rr) in the progeny, and p = frequency of alleleR. A full range (0 to 100%) of outcrossing rates was found in the first generation, % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabeiDayaara% Gaeyypa0JaaGimaiaac6cacaaIZaGaaGymaiaacYcacqGHGaaicqGH% GaaicuaHdpWCgaqcamaaBaaaleaacaqG0baabeaakiabg2da9iaaic% dacaGGUaGaaGOmaiaaiwdaaaa!441B!\[{\text{\bar t}} = 0.31, \hat \sigma _{\text{t}} = 0.25\], and the distribution was significantly skewed toward high outcrossing.
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