(6) One of the most accurate and rapid molecular techniques for detecting aneuploidies is to apply multiplex amplification of microsatellite markers that consists of amplifying polymorphic regions located on the chromosomes
of choice to determine the number of copies of those chromosomes
present for each cell.
It marks the first time that organisms that naturally have multiple chromosomes
have been artificially transformed into a single-chromosome form, scientists said.
The data was stored in the word file for the arrangement of information about the overlapping genes present on the chromosomes
. Additionally, the images were stored in power point slides according to the chromosomes
The basic diploid chromosome
of maize (Zea mays L.) is comprised of 20 A chromosomes
Eventually, the collaboration, which includes over 200 researchers, hopes to design, build and integrate into the cells all 16 of yeast's chromosomes
These dicentric and acentric chromosomes
are unstable during mitosis and would be lost from the daughter cells because of missegregation.
In the new experiments, the mice lacked the gene because they didn't have Y chromosomes
. So the team substituted a similar gene from the X chromosome
Wilson Sayres from the University of California, Berkeley said that the Y chromosome
has lost 90 percent of the genes it once shared with the X chromosome
, and some scientists have speculated that the Y chromosome
will disappear in less than 5 million years.
Unlike the other human chromosomes
, the majority of the Y chromosome
does not exchange genetic material with other chromosomes
, which makes it simpler to trace ancestral relationships among contemporary lineages.
Summary: TEHRAN (FNA)- The discovery and analysis of an extremely rare African American Y chromosome
pushes back the time of the most recent common ancestor for the Y chromosome
lineage tree to 338,000 years ago.
are divided into two groups: those in which one normal chromosomal homologue is replaced by a ring equivalent, and those in which the ring chromosome
is additional to the two normal copies of that chromosome
; such a ring is termed a supernumary.
Most animal DNA consists of two sets of chromosomes
, while most plant species have four or six.