How does translocation affect the chromosome?
How does translocation affect the chromosome?
A translocation occurs when a piece of one chromosome breaks off and attaches to another chromosome. This type of rearrangement is described as balanced if no genetic material is gained or lost in the cell. If there is a gain or loss of genetic material, the translocation is described as unbalanced .
What are numerical chromosome abnormalities?
Numerical abnormalities are a type of chromosome defect. These types of birth defects occur when there is a different number of chromosomes in the cells of the body from what is usually found. So, instead of the typical 46 chromosomes in each cell of the body, there may be 45 or 47 chromosomes.
Can translocation cause mutations?
A translocation is a type of abnormal change in the structure of a chromosome that occurs when a part of one chromosome breaks off and sticks to another chromosome. These “mutations” are an important cause of many types of lymphomas and leukemias.
How are translocations induced in plants and animals?
Translocations have been induced through various physical and chemical mutagens in several plant and animal species. Translocations originate through chromosome breakage and reunion. It can also be interpreted on the basis of exchange model.
What is the definition of inter chromosomal translocation?
Inter-Chromosomal translocation: A chromosomal segment is transferred from one chromosome to another one. It may be either fraternal or external.
How are translocations of chromosomes induced by mutagens?
(i) Translocations may originate spontaneously. (ii) They may be induced by mutagens, viz., ionizing radiations and many chemical mutagens, since they induce chromosome breakage. (iii) Translocations may be induced by growing plants in calcium-deficient media, as reported by Nilan and Phillips in 1957.
How is a translocation different from a chromatid?
The unit of translocation may be a chromosome (chromosomal translocation) or a chromatid (chromatid translocation). Translocation may be classified on the basis of the trans-located segment being present in the same, homologous or non-homologous chromosome, and the number of breaks involved in the translocation.
