SYSTEMS OF MATING

Question 1

SYSTEMS OF MATING

Answer 1

1. alternative strategies for mating of animals selected to be parents
2. influence gene combinations of progeny
3. influence degree of homozygosity and heterozygosity of population

Question 2

CLASSIFICATION OF MATING SYSTEMS

Answer 2

1. inbreeding
2. outbreeding

Question 3

INBREEDING

Answer 3

1. mating of related animals
2. increase chance for more alleles of each genes of progeny to be identical

Question 4

INBREEDING COEFFICIENT

Answer 4

1. measure of level of inbreeding

Question 5

CONSEQUENCES OF INBREEDING

Answer 5

1. reduced fertility
2. reduced litter size
3. reduced viability (inbreeding depression)
4. loss of genetic variation
5. loss of genetic progress

Question 6

LINE BREEDING

Answer 6

1. low level of inbreeding
2. mating of animals under same genetic line but not highly related
3. results to pure breeds with similar appearances

Question 7

OUTBREEDING

Answer 7

1. mating of unrelated animals
2. take advantage of heterosis and complementarity

Question 8

TYPES OF OUTBREEDING

Answer 8

1. crossbreeding
2. outcrossing
3. linecrossing
4. grading-up
5. species hybridization

Question 9

CROSSBREEDING

Answer 9

1. crossing of two different breeds/lines of animals
2. takes advantage of breed complementarity

Question 10

HETEROSIS

Answer 10

1. hybrid vigor
2. animal performance of cross is greater than average of its parents

Question 11

COMPLEMENTARITY

Answer 11

1. captured using dam lines and terminal sire lines

Question 12

DAM LINES

Answer 12

1. specialized female parents
2. possess combination of good female reproductive performance and growth performance

Question 13

TERMINAL SIRE LINES

Answer 13

1. specialized male parents
2. selected for growth performance