How do you estimate the narrow sense heritability based on the halfsib offspring of open pollinated trees?


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2009-11-20 07:53:03
2009-11-20 07:53:03

First we need to calculate within and between family variance components for half sib families. Additive variance is equal to 4 time the additive variance and Dominance variance equal to within family variance - (3/4) additive variance.

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Half the genes a calf gets is from his sire, and the other half from his dam. Some genes will be more dominant than others, depending on which of his parents has the dominant gene, and some, like carcass characteristics from his sire, are more heritable than others. Often a bull that has better genetics than the rest of the cowherd will produce calves that have slightly better genetics than their dams. Some of the more heritable traits that a bull's offspring can receive from him, if he's better quality than the cowherd, are: Lean/bone ratio (60% heritability) Lean percentage (55% heritability) Mature cow weight (50% heritability) Carcass grade (45% heritability) Thickness of outside carcass fat (45% heritability) Dressing percentage (40% heritability) Marbling (40% heritability) Ribeye area (40% heritability) Yearling weight (feedlot)(40% heritability) Yearling weight (pasture (35% heritability) Efficiency of gain (35% heritability) Birth weight (30% heritability) Post-weaning gain (30% heritability) Tenderness (meat quality) (30% heritability) Carcass weight (25% heritability) Weaning weight (25% heritability) Calf survival (10% heritability) Calving interval (10% heritability) Calving ease (10% heritability) The definition of heritability is: "The proportion of the differences among cattle, measured or observed, that is transmitted to the offspring. Heritability varies from 0 to 1. The higher the heritability of a trait, the more accurately does the individual performance predict breeding value and the more rapid should be the response due to selection for that trait."

Lamarck give the idea that an organism can pass on characteristics that it acquired during its lifetime to its offspring. Also known as heritability.

With heritability the traits of the parent get transferred to the offspring, so you can predict what the offspring will look like and select the parents accordingly. Without that, breeding wouldn't be much use.

After a flower has been pollinated it begins to create a small plant. This is sexual reproduction and give the offspring DNA from both parents.

Lamarck give the idea that an organism can pass on their characteristics that it have acquired during its lifetime to its offspring. Also known as heritability of acquired characteristics.

Without the heritability of individual traits what difference would it make if the individual was selected. An individual that has a germ line mutation, say, and this mutation could confer survivability and reproductive success on progeny thus passes this mutation to said offspring is selected. Then evolution, the change in allele frequency over time in a population of organisms, could take place. Heritability is all as individuals are selected but populations evolve.

Heritability is the likelihood of different traits being passed down in a species. It is more difficult to estimate in humans than in livestock or laboratory animals because humans are less controlled. Humans will interbreed among races and cultures, while animals generally keep to their own type.

Heritablility values range from 0-1 so the maximum value of heritability would be 1.

When angiosperms are pollinated by bees, the pollen which they receive is usually from a different plant. By pollinating the flower with pollen from a different plant, the bees are increasing the genetic diversity of the offspring. If self-fertilisation in angiosperms does occur, the offspring will be clones of their parents.

Heritability is the proportion of Phenotypic variation in a population that is attributable to genetic variation among individuals. Phenotypic variation among individuals may be due to genetic and/or enviromental factors. Heritability analyses estimate the relative contributions of differences in genetic and non-genetic factors to the total phenotypic variance in a population.

Petals are both wind pollinated and insect pollinated, not one or the other. Insect pollinated petals are large and brightly colored while wind pollinated petals are small and brown or green in color.

Pollination is necessary for fertilization, without fertilization you won't have offspring. Sexual reproduction requires a union of male and female gametes to be successful.

Most are pollinated by bees, but many specialised crops can be pollinated by humans.

sesame is self or cross pollinated crop

A lily could be pollinated by either wind or insect, although they are more lilkily to be insect pollinated

It has to be pollinated by a bee It has to be pollinated by a bee

Salvia is pollinated by bees and hummingbirds.

Poppies are cross pollinated by insects.

Insect pollinated. Wind pollinated stigmas are generally feathery.

nothing, it doesn't matter how the flower is pollinated it just has to be pollinated!

Broad sense heritability A.K.A (H) is the degree in which phenotypic variation is due to genetic factors Narrow sense heritability A.K.A (h) is the degree in which phenotypic variation is due to additive genetic factors. in maths terms... H = Vg/Vt h = Va/Vt Vg= genetic varaition Vt = total variation Va = additive variation

i think their pollinated by the plant growers

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