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What is the condition in which an individual has three copies of a chromosome?
The condition in which an individual has three copies of a chromosome is called trisomy. It can result in genetic disorders such as Down syndrome, which is caused by an extra copy of chromosome 21.
What is The chromosome number in daughter cells after meiosis?
Daughter cells in mitosis are exact copies of the parent cell; therefore, they have the same number of chromosomes.
Is Down syndrome a genetic disorder or a chromosome disorder?
Down syndrome is a chromosomal disorder. It is caused by having 1 extra chromosome (chromosome 21).
What does the karyotype of a person with down syndrome show?
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21.
How does a pair of sister chromosome differ from a single unduplicated chromosome?
Sister chromatids are two copies of a replicated chromosome. Chromosomes occur in pairs. These will be separated in anaphase of mitosis and one chromatid pair will be left for each daughter cell.
Each chromosome consists of 2 what?
Each chromosome consists of two sister chromatids, which are identical copies of the chromosome connected at a region called the centromere. During cell division, the sister chromatids separate and each is passed on to a daughter cell.
What is difference between chromosome and chromatids?
A chromatid is one-half of two identical copies of a replicated chromosome. During cell division, the identical copies are joined together at the region of the chromosome called the centromere. They are known as sister chromatids. Once the paired sister chromatids separate from one another in anaphase of mitosis, each is known as a daughter chromosome. [source: About.com/Biology, see link below]
Cell division and chromosome duplication?
Cell division is the process by which a cell divides into two daughter cells. Chromosome duplication occurs during the cell cycle when the DNA is replicated to create identical copies of each chromosome. This ensures that each daughter cell receives a complete set of genetic material.
What is the presence of three of a particular chromosome?
The presence of three copies of a particular chromosome is known as trisomy. This genetic condition can lead to developmental abnormalities, such as Down syndrome which is caused by trisomy of chromosome 21.
What are sister chromotids?
Idenical copies of a chromosome
When an original chromosome copies it is said to?
synthesize
Type of mutation that causes Trisomy 18?
Trisomy 18 is caused by a type of mutation called nondisjunction, where an error in cell division results in an extra copy of chromosome 18. This leads to the presence of three copies of chromosome 18 in each cell instead of the normal two copies.
