Hayes and Garber - Cucurbit Breeding

CLASSIFICATION AND INHERITANCE OF SMALL GRAINS 101
with very low fruitfulness in Fi and a ratio indicating one main
factor difference in F 2 .
FIG. 24. Individual spikes of Ft generation of cross of Svanhals X Manchuria
representing the phenotypic progeny classes in which lateral florets bear awns.
From left to right: Low fertility awned plant which will give all classes of
segregates in F 3 as in F2; high fertility awned which will segregate into intermedium,
high fertility awned and six-rowed in ^3; six-rowed which will breed
true in F 3 .
(After Harlan and Hayes, 1920.)
Biffen (1907b) found the sexless condition dominant in a cross
between deficient and two-rowed. Results from an F z generation
of a similar cross grown at the Minnesota station indicate that
it is almost impossible to separate deficiens r two-rowed, and inter-