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back-cross
back-cross v. 
/ˈbakkrɒs/, /ˈbækˌkrɑs/ Biology (transitive) to cross (a hybrid) with one of its parents.
Brit. /ˌbakˈkrɒs/
, /ˌbakˈkrɒs//ˈbakkrɒs/U.S. /ˈbækˌkrɔs/
, /ˈbækˌkrɔs//ˈbækˌkrɑs/ΘΚΠ
the world > life > biology > biological processes > genetic activity > heredity or hereditary descent > [verb (transitive)] > cross
mella1387
cross-breed1675
mix1740
cross1754
hybridize1845
mongrelize1859
interbreed1865
outbreed1888
back-cross1904
outcross1918
1904 Jrnl. Royal Microsc. Soc. 52 The correctness of Mendel's hypothesis of the purity of the germ-cells and of their production in equal numbers, is shown by back-crossing of a hybrid with one of the parental forms... Any one of them back-crossed with the recessive parent will produce 50 p.c. pure recessives and 50 p.c. hybrids.
1915 T. H. Morgan et al. Mechanism Mendelian Heredity iii. 52 If the F1 males are backcrossed to black vestigial females only two classes result.
back-cross
back-cross n. /ˈbækˌkrɑs/ an instance or product of back-crossing.
Brit. /ˈbakkrɒs/
, /ˈbakkrɒs/U.S. /ˈbækˌkrɔs/
, /ˈbækˌkrɔs//ˈbækˌkrɑs/ΘΚΠ
the world > life > biology > biological processes > genetic activity > heredity or hereditary descent > [noun] > cross-breeding or hybridism > hybrid or cross
mongrel1558
hybrid1601
centaur1606
mulatto1664
half-strain1673
cross1761
cross-breed1774
first cross1793
double-cross1810
quadroon1811
intercross1859
outcross1882
reciprocal1901
filial generation1902
monohybrid1902
vicinist1905
first filial (or F₁) generation1909
polyhybrid1910
back-cross1919
second filial (or F₂) generation1938
1919 C. B. Bridges & T. H. Morgan Contrib. Genetics of Drosophila Melanogaster 172 No back-cross which involved autosomal linkage had been possible.
1919 C. B. Bridges & T. H. Morgan Contrib. Genetics of Drosophila Melanogaster 171 Two autosomal back-crosses had been completed.
1919 C. B. Bridges & T. H. Morgan Contrib. Genetics of Drosophila Melanogaster 173 (heading) Back-Cross Test of Females, Purple Vestigial ‘Coupling’.
1931 E. B. Ford Mendelism & Evol. i. i. 6 Segregation will also occur if heterozygotes are mated with either of the homozygous types. Such a mating is known as a ‘back cross’, for it is produced when the F1 (heterozygous) generation is crossed back to one of the parents.
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