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DNA content of gametic cell is half of that of somatic cell.
Using genome-wide distribution data for a wide range of non-histone proteins and histone marks available for D. melanogaster cell lines [35,36,40], we analyzed the protein composition and chromatin features in genomic regions of cell line chromosomes corresponding to 13 interband regions of polytene chromosomes. Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female. In the formation of a zygote out of a sperm and an oocyte their single chromosomes are regrouped into pairs. Activité 1 : Composition chimique des chromosomes Les chromosomes sont visibles, uniquement au cours d’un moment spécifique : La division cellulaire.
A ce moment-là, il est plus facile de les étudier. Calcium is also present in addition to these constituents. Twenty-two of these pairs, called autosomes, look the same in both males and females. In humans the sex chromosomes consist of one pair of the total of 23 pairs of chromosomes. Several questions loom large regarding the origin and composition of the D. melanogaster B chromosomes. The 23rd pair, the sex chromosomes, differ between males and females. In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Chemical composition of chromosome • Chemically chromosomes are nucleoprotein in nature means are composed of RNA, DNA and protein. • Generally chromosomes contains 30-40% DNA, 50-65% protein and 0.5- 10% RNA 1) DNA- The amount of DNA present in somatic cell is constant. Chapter 2.3 Structure and composition of chromosomes. The major chemical components of chromosomes are DNA, RNA, histone proteins and nonhistone proteins.
Females have two copies of the X chromosome, while males have one X and one Y chromosome. The sex chromosomes of human beings and other mammals are designated by scientists as X and Y. The different number of chromosomes impedes the production of crosses between species. Chromosomes are thread-like molecules that carry hereditary information for everything from height to eye color. Chemical composition of chromosomes.
It is presently unclear what differences exist, if any, in the size of the B chromosomes as current cytological methods of B chromosome examination do not have the resolution to resolve subtle differences in size.