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In the four succeeding chapters, the most apparent and gravest difficulties on the theory will be given: namely, first, the difficulties of transitions, or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately constructed organ; secondly the subject of Instinct, or the mental powers of animals, thirdly, Hybridism, or the infertility of species and the fertility of varieties when intercrossed; and fourthly, the imperfection of the Geological Record.

Briefly, 2 White Duroc sires and 17 Erhualian dams were mated to produce [F.sub.1] animals in 2001, from which 9 [F.sub.1] boars and 59 [F.sub.1] sows were intercrossed to produce 983 [F.sub.2] males and 929 [F.sub.2] females in 6 batches from 2003 to 2006.

Genome-wide association study identifies 22 new loci for body dimension and body weight traits in a White DurocxErhualian [F.sub.2] intercross population

ruziziensis breeding program conducted by Embrapa Gado de Leite, Juiz de Fora, Minas Gerais State, and were intercrossed and produced progenies with pollen viability higher than 90% (PAULA et al., 2014).

Stability in chromosome number and DNA content in synthetic Tetraploids of Lolium Multiflorum after two generations of selection/Estabilidade no numero cromossomico e no conteudo de DNA em tetraploides sinteticos de Lolium multiflorum apos duas geracoes de selecao

Reciprocal crosses between DDD and B6 strains produced DB ([female] DDD x [male] B6) [F.sub.1] and BD ([female]B6 x [male] DDD) [F.sub.1] mice, both of which were intercrossed to produce DB [F.sub.2] (n = 150) and BD [F.sub.2] (n = 150) male mice [11].

Identification of Quantitative Trait Loci That Determine Plasma Total-Cholesterol and Triglyceride Concentrations in DDD/Sgn and C57BL/6J Inbred Mice

Then the four heterozygous male mice were imported to Peking University Third Hospital and matched and rotated with young female C57Bl/6 mice and bred eight generations; PCR male heterozygous mice were crossed with C57B1/6 females to give N1F0 offspring, which were subsequently intercrossed to generate N1F1 offspring.

Renal Urotensin II System Plays Roles in the Regulation of Blood Pressure in Dahl Salt-Resistant Rat

The first set of intercrossed progeny from the third backcross was planted in 2002.

Popular American tree makes a comeback

The two strains were intercrossed to transfer the [Ins2.sup.KO] allele to the NOD.[[beta].sub.2][m.sup.KO].HHD strain.

An HLA-transgenic mouse model of type 1 diabetes that incorporates the reduced but not abolished thymic insulin expression seen in patients

Artisans Selliers brought the concept to life by creating intercrossed black lacing and binding two pink calfskin leather portions of the strap to the watch's pave diamond-coated lugs.

Velvet goldmine: the new women's collection from Roger Dubuis embodies handcrafted luxury, both inside and out