N tetraploids the degree of multivalent formation at meiosis is often used as a 'wit erion of homology between the chromosome sets and gives information on the genetic control of chromosome association. Where the chiasma frequency of each association can be recorded in a number of cells, the observed association frequencies could be profitably compared with frequencies expected, assuming they a...

It is shown how linear genetic algebras, ordinarily applied in situations with discrete time, will also simplify certain systems of differential equations in time continuous models. These models describe the variation of genotype frequencies in infinite populations in different mating systems. The cases considered include matings between individuals randomly drawn from the population at each mo...

The flavonoids of two diploid species of Phlox and two of their allotetraploid derivatives were characterized. The tetraploids accumulate five flavonoids not observed in the parental species. Generally, novel compounds are less highly glycosidated than, but otherwise similar to, parental compounds that they partially or totally replace. We propose that hybridity and polyploidy have repressed or...

Suppose there are d diploids and m tetraploids. In the language of [2], there are m models h = 1, h = 2, . . . h = m, where h is the number of hybridizations. Each model has a different number of parameters. Let W be the network topology and node times. The conditional priors π(W |h) must be comparable for different values of h in order to calculate the correct acceptance ratios when jumping be...