Researching Uses for Chromosome Probes

Research on the use of chromosomal probes Recently sensitive chromosome probes discovered by geneticists at university have been used to detect specific types of genetic and prenatal illnesses and to judge fathers and forensic in criminal cases Easy to provide evidence. The probe is a short segment of DNA that binds to a specific site on the chromosome and is actually shown exactly. Since these new detectors are actually repeated in hundreds or even thousands of times at specific locations, they are more sensitive than previously available detectors.

Human karyotypes are "drawn" using fluorescent DNA probes. Each of these mitotic chromosomes consists of a pair of sister chromatids linked by their centromeres. Images of homologous chromosome pairs (eg, two copies of chromosome 1) are arranged adjacent to each other. Bolzer et al. , Image from (2005) Three-dimensional map of all chromosomes in the human male fibroblast nucleus and the prometaphase rosette. Chromosomes that do not differ between men and women are called autosomes, and different chromosomes between men and women are sex chromosomes X of most mammals. Y. The most common human has 22 pairs of autosomes and 1 pair of sex chromosomes (XX or XY), with a total of 46 chromosomes. We say that human beings have 2N = 46 chromosomes, of which 23 = number of haploid chromosomes.

Identifying genes on each chromosome is an active field of genetic research. Because the researchers use different methods to predict the number of genes on each chromosome, the number of genes estimated is different. The X chromosome may contain between 800 and 900 genes, which provide instructions for making proteins. These proteins play a variety of roles in the body.

The role of Y chromosome in sex determination is clear, but the study showed that it is experiencing a rapid deterioration of evolution. For many generations ago, the Y chromosome was large and contained the same number of genes as the X chromosome. Currently it is only a small part of the past size and contains less than 80 functional genes. This brought concern over the years of discussion and the ultimate fate of the Y chromosome. Many people speculate that the Y chromosome becomes redundant and may be completely corrupted over the next 10 million years. Y chromosome studies are challenging due to the palindromic and repetitive nature of their DNA sequences, but recent advances in genomics have provided some unexpected insights.