Topic 41

Question 1

Continuous hybridization techniques

Answer 1

crisscross breeding; rotational crossing

Question 2

Crisscross

Answer 2

breeding of crossebred females to purebred males of two different breeds alternatively using paternal heterosis

Question 3

Rotational crossing

Answer 3

Three or more breeds; first crossbred females (F1=AB) are AI’d by a purebred male C; The next female generation (R1=ABC) are inseminated by a new purebred male (D); Next female generation (R2=ABCD) are insemintead by A sire; Males and culled females are end product

Question 4

Recombination losses

Answer 4

loss of heterozygosity due to homologous recombination, one allele variety is lost, can potentially lead to disease development (loss of tumor suppression allele).