Admin Where are chromosome duplicated?
interphase
Explanation: DNA replication (and thus chromosome duplication) occurs during the interphase , the part of the cell cycle in which the cell is not dividing. It is important to know that the interphase is not part of mitosis.
What stage are chromosomes duplicated?
Then, at a critical point during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division. If all conditions are ideal, the cell is now ready to move into the first phase of mitosis.
Where is the DNA duplicated?
DNA replicates in the S phase of the cell cycle and initiates at specific regions in the DNA sequence known as DNA replication ‘origins’. A number of proteins participate in DNA replication and the process is subject to scrutiny by cell surveillance mechanisms called cell cycle checkpoints.
Which chromosome is duplicated?
The duplication occurs when part of chromosome 1 is copied (duplicated) abnormally, resulting in the extra genetic material from the duplicated segment. If the condition is inherited from a parent, it means that one of the parents also has the extra piece of genetic material.
What is Trisomy 21 also known as?
‘ Down syndrome is also referred to as Trisomy 21. This extra copy changes how the baby’s body and brain develop, which can cause both mental and physical challenges for the baby. Even though people with Down syndrome might act and look similar, each person has different abilities.
When does a duplication of a chromosome occur?
Duplication of chromosome is another type of chromosomal rearrangement. Duplication of chromosome occurs when a fragment of DNA detaches from a chromosome and re-attaches into a homologous chromosome. As a result, an extra copy of some chromosome region is produced in the homologous chromosome.
When is the genetic material of a cell duplicated?
The genetic material of the cell is duplicated during S phase of interphase just as it was with mitosis resulting in 46 chromosomes and 92 chromatids during Prophase I and Metaphase I. What is the relationship between chromatin and chromosomes?
What happens when DNA is deleted from a chromosome?
Chromosomal rearrangements can happen due to deletions or duplications. In chromosomal deletion, a fragment of DNA detaches from the chromosomes and fails to reattach to the same chromosome. Hence, the detached segment is lost.
Which is an example of a duplication mutation?
The term “duplication” simply means that a part of a chromosome is duplicated, or present in 2 copies. One example of a rare genetic disorder of duplication is called Pallister Killian syndrome, where part of the #12 chromosome is duplicated.