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The Journal of Heredity 1978:69(1):59-60
© 1978 The American Genetic Association 69:59-60

other

Segregation of reciprocal translocations in the cabbage looper

D. T. NORTH

The author is affiliated with the Metabolism and Radiation Research Laboratory, U.S. Department of Agriculture, ARS, Fargo, North Dakota 58102

Abstract

Heterozygous translocations were recovered in the F male progeny from only one of three crosses involving an F2 male heterozygous for an interchange. A larger than expected number (II percent) of the F2 males derived from the cross of a normal female x a heterozy gous translocation male were trisomics. It was not determined whether these were tertiary or interchange trisomes, but the number recovered balanced the number of monosomics and nullisomics recovered. There was a lower than expected number of progeny having a heterozy gous translocation (6.9 percent), but the number having normal, paired bivalents was as expected (44.1 percent). The largest class of individuals among the F2 progeny other than normals (31 II) was the class in which testes contained no primary or secondary spermatocytes. Chromosome orientation, rather than duplications-de ficiencies, appears to be the biggest factor influencing fertility, as is the case in species with localized centromeres.


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