Technical Abstract: Root-knot nematodes (Meloidogyne spp.) are serious pests of carrot (Daucus carota L.) worldwide. While soil treatment with nematicides is the primary means for managing nematodes in carrot, there is a need to identify and introduce host plant resistance for crop improvement. This study was conducted to determine the inheritance of resistance to root-galling and reproduction by M. javanica (Treub) Chitwood in a selection of carrot variety, Brasilia. F2, F3, F4, and BC1 progenies from the cross, BR1252 X B6274, (a susceptible inbred line) were screened in pot tests for reaction to M. javanica. The observed reactions based on galling and egg production on fibrous roots gave segregation patterns in all tests that were consistent with relatively simply inherited dominant resistance. Field testing in progress indicates that this resistance is very effective against both M. javanica and M. incognita. A single gene model fits the observed data acceptably well in F3 generations. The range of 3 percent to 51 percent susceptible plants in segregating F3 families and 1 percent to 47 percent in segregating F4 families is much wider than the 25 percent expected with a single gene model, and linked duplicate factors in the coupling phase could also explain the observed segregation patterns. Egg production data in the F2, F3, and F4 families provided evidence for slightly lower resistance expression in the heterozygous condition.