Infertility definition and causes?
The mechanism of sterility:
Hybrid sterility may occur as a result of the production and reproduction of different offspring from closely related species, and these animals are usually sterile due to the presence of different numbers of chromosomes coming from the parents, which leads to an imbalance in the resulting offspring, as they will be able to survive but are not fertile, as well as It happens with a mule.
Infertility can also occur as a result of what is known as artificial selection / selective reproduction, when a selected genetic trait is closely related to genes involved in sex assignment or fertility determination, for example goat lines that are intended to be reproduced selectively without centuries, resulting in the production of a large number of binary individuals Sex (intersexuality) is among the offspring and is usually sterile.
Infertility may also occur due to chromosomal differences in the same individual, and this condition is called mosaicism – the affected person will have a mixture of normal and mutated cells.
Loss of part of a chromosome can also lead to sterility, because it does not separate during mitosis.
XX male syndrome is another cause of infertility, as the genetic determining factor for the sex on the Y chromosome, called SRY, is transmitted to the X chromosome due to the unequal crossing between the two chromosomes.
It causes the development of his testicles, and as a result, his phenotype is male, but his genotype is female.
Economic uses of sterility:
- Produce certain types of fruit without seeds, such as tomatoes or melons (although sterility is not the only method available to produce these fruits).
- Genetic Use Reduction Technique: Methods aimed at limiting the use of genetically modified plants by making second generation seeds sterile.
- Biological control or biological control, such as methods that use castrated cat traps (i.e. aim to make cats unable to conceive), or the sterile insect technique in which large numbers of sterile insects are released and released to compete with fertile insects for food and attract peers, this leads to Reducing the population of subsequent generations. It can be used to control pests and diseases spread by insects such as malaria in mosquitoes.
- Some animals can produce sterile offspring due to interbreeding with closely related species, such as the mule, gene, tiger lion, and taigon.
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