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 the types of chromosomal translocation?
There are two main types of translocations: reciprocal and Robertsonian. In a reciprocal translocation, two different chromosomes have exchanged segments with each other. In a Robertsonian translocation, an entire chromosome attaches to another at the centromere.
What is an example of a translocation mutation?
Examples of these translocations include the activation of the MYC oncogene by the t(8;14) translocation in Burkitt’s lymphoma and of the gene by a t(1;14) translocation or a SIL gene translocation on chromosome 1p32 in T-ALL. Most of the chromosomal translocations observed in T-ALL are of this type.
When does translocation occur in meiosis?
Translocations occur when chromosomes become broken during meiosis and the resulting fragment becomes joined to another chromosome.
How many chromosomes are involved in translocation?
Translocation Down syndrome is a type of Down syndrome that is caused when one chromosome breaks off and attaches to another chromosome. In this case, there are three 21 chromosomes but one of the 21 chromosomes is attached to another chromosome.
What is translocation chromosomal mutation?
​Translocation Translocation is a type of chromosomal abnormality in which a chromosome breaks and a portion of it reattaches to a different chromosome. Chromosomal translocations can be detected by analyzing karyotypes of the affected cells.
What stage of meiosis does translocation occur?
Chromosome inversions and translocations can be identified by observing cells during meiosis because homologous chromosomes with a rearrangement in one of the pair must contort to maintain appropriate gene alignment and pair effectively during prophase I.
What do you mean by translocation?
Definition of translocation : the act, process, or an instance of changing location or position: such as. a : the conduction of soluble material (such as metabolic products) from one part of a plant to another.
What causes a chromosomal translocation?
Translocations generally result from swapping of chromosomal arms between heterologous chromosomes and hence are reciprocal in nature (Figure 1) (8,9). DNA double-strand breaks (DSBs) are prerequisites for such translocations, although little is known about their generation.
What is reciprocal translocation in meiosis?
Translocations Translocations occur when chromosomes become broken during meiosis and the resulting fragment becomes joined to another chromosome. Reciprocal translocations: In a balanced reciprocal translocation (Fig. 2.3), genetic material is exchanged between two chromosomes with no apparent loss.
What is the difference between translocations and reciprocal translocations?
Translocations occur when chromosomes become broken during meiosis and the resulting fragment becomes joined to another chromosome. Reciprocal translocations: In a balanced reciprocal translocation ( Fig. 2.3 ), genetic material is exchanged between two chromosomes with no apparent loss.
How are chromosome inversions and translocations identified?
Chromosome inversions and translocations can be identified by observing cells during meiosis because homologous chromosomes with a rearrangement in one of the pair must contort to maintain appropriate gene alignment and pair effectively during prophase I.
What is the difference between deletions duplications and translocations?
Deletions: A portion of the chromosome is missing or deleted. Duplications: A portion of the chromosome is duplicated, resulting in extra genetic material. Translocations: A portion of one chromosome is transferred to another chromosome.
