Selective Breeding

Created by: Rebecca Crackett
Created on: 27-04-13 15:49


	Selective Breeding
	Advantages It can produce high-yielding animals and plants: More meaty cows, bigger vegetables It can be used to produce animals and plants that have increased resistance to disease: This means farmers have to use fewer drugs and pesticides. Animals and plants could be bred to have increased tolerance of bad conditions, eg. drought, cold: They will survive longer and grow stronger	Disadvantages It can cause health problems. E.g. dairy cows are often lame and have a short life expectancy because of the extra strain making and carrying loads of milk puts on their bodies. It reduces genetic diversity, which results in an increased incidence of genetic disease and an increased susceptibility to new diseases because of the lack of alleles in the population
	Evaluation Selective breeding is: (or artificial breeding) the process of breeding the animals with the characteristics you want with other animals with those characteristics to produce more animals with good characteristics over many generations. This must be continued over many generations, taking offspring and breeding them with the ones you already have, and you will get many animals with the desired traits. Selective breeding can be a very helpful mechanism with many positive points, but it can also provide a lot of problems and issues which may be irreversible.

Selective Breeding

Advantages

It can produce high-yielding animals and plants: More meaty cows, bigger vegetables
It can be used to produce animals and plants that have increased resistance to disease: This means farmers have to use fewer drugs and pesticides.
Animals and plants could be bred to have increased tolerance of bad conditions, eg. drought, cold: They will survive longer and grow stronger

Disadvantages

It can cause health problems. E.g. dairy cows are often lame and have a short life expectancy because of the extra strain making and carrying loads of milk puts on their bodies.
It reduces genetic diversity, which results in an increased incidence of genetic disease and an increased susceptibility to new diseases because of the lack of alleles in the population

Evaluation

Selective breeding is: (or artificial breeding) the process of breeding the animals with the characteristics you want with other animals with those characteristics to produce more animals with good characteristics over many generations. This must be continued over many generations, taking offspring and breeding them with the ones you already have, and you will get many animals with the desired traits.
Selective breeding can be a very helpful mechanism with many positive points, but it can also provide a lot of problems and issues which may be irreversible.

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Selective Breeding