Heritability

Birth and weaning weight of swine

10%

Feed efficiency of swine

30%

Backfat thickness of swine

50%

Carcass length of swine

55%

Percent ham of swine

40%

Loin eye area of swine

60%

Conformation score of swine

50%

Litter size of swine

10%

Egg production of poultry

35%

Egg weight of poultry

60%

Shank length of poultry

45%

Body depth of poultry

45%

Egg hatchability of poultry

10%

Livability of poultry

10%

Milk production of cattle

25%

Percent lean cuts of cattle

60%

Tenderness of cattle

50%

Marbling of cattle

50%

Calving interval of cattle

10%

Birth weight of cattle

40%

Heat tolerance of cattle

20%

Low hatchability

Less than 15%

Medium hatchability

20 - 25%

High hatchability

60% above

Additive

Each gene adds a fixed effect, traits increase cumulatively

Non additive

Interactions among genes affect traits, no addition of effects

Complete dominance

One allele masks the other

Incomplete dominance

Neither allele is dominant, blended phenotype

Codominance

Both alleles are fully and separately expressed

Overdominance

Heterozygote superior

Epistasis

One gene blocks another

Sex linked

On X chromosome

Sex limited

Only in one sex

Sex influenced

Different in sexes