Table 2. List of genotypes for seed component tissues and endosperm genotypic frequencies in an F2 seed population segregating for a dormancy locus (D/d).
| Female Gamete | Male Gamete | Genotypic Frequencya | |
|---|---|---|---|
| d (0.5) | D (0.5) | ||
| d (0.5)b | ddd (dd) [Dd]c | Ddd (Dd) [Dd] | Fd’’ = Fddd + FDdd |
| Fddd = Nddd/N (0.25)b | FDdd = NDdd/N (0.25) | ||
| D (0.5) | DDd (Dd) [Dd] | DDD (DD) [Dd] | FD’’ = FDDd + FDDD |
| FDDd = NDDd/N (0.25) | FDDD = NDDD/N (0.25) | ||
| Genotypic frequencya | Fd’ = Fddd + FDDd | FD’ = FDdd + FDDD | |
| Overall allelic frequency | Fd = Fddd + 0.5FDdd + 0.5FDDd | FD = FDDD + 0.5FDDd + 0.5FDdd | |
a
Genotypic frequencies for male (Fd’ and FD’) and female (Fd’’ and FD’’) gametes involved in the double fertilization to form the seed population.
b
The value in the parentheses is the Mendelian expectation for the endosperm (0.25) or gamete (0.5) genotypic frequency, or the overall allelic frequency (0.5).
c
Genotypes for the endosperm (triploid), embryo (parentheses), and maternal (brackets) tissues of a seed at a dormancy locus with the two functionally differentiated alleles D and d. Fddd, FDdd, FDDd, and FDDD are genotypic frequencies for the ddd, Ddd, DDd, and DDD endosperms, respectively, estimated based on the number of seeds for individual genotypes (Nddd, NDdd, NDDd, and NDDD) and the population size (N).