Nucleus and ribosomes

[cninikin]

Can anyone please help ,by explaining how ribosomes are synthesis in the nucleus?

 

 

[BabcockHall]

Maybe you mean nucleolus.

[claudepa]

Can anyone please help ,by explaining how ribosomes are synthesis in the nucleus?

 

 

 

ribosomal proteins are synthetized in the cytoplasm and then sent to the nucleolus. Ribosomal subunits are assembled in the nucleolus and then sent in the cyytoplasm where ribosomes are assembled. Ribosomal subunits can go through the nuclear membrane pores thanks to an active transport with receptors which trigger an opening of the pores.

[rhynzy]

Can anyone tell me how does Chromosome produces in nucleus?

[roger roger]

Can anyone tell me how does Chromosome produces in nucleus?

Chromosomes are made from DNA. Genes are short sections of DNA. Genetically identical cells are produced by a type of cell division called mitosis. In sexual reproduction, a male gamete fuses with a female gamete to produce a new cell. This is called fertilization. Gametes are produced by a type of cell division called meiosis. They contain a single set of chromosomes, whereas body cells contain two sets of chromosomes. The cell’s nucleus contains chromosomes made from long DNA molecules.

[rhynzy]

 

Chromosomes are made from DNA. Genes are short sections of DNA. Genetically identical cells are produced by a type of cell division called mitosis. In sexual reproduction, a male gamete fuses with a female gamete to produce a new cell. This is called fertilization. Gametes are produced by a type of cell division called meiosis. They contain a single set of chromosomes, whereas body cells contain two sets of chromosomes. The cell’s nucleus contains chromosomes made from long DNA molecules.

 

Thanks for the help

Edited May 16, 2017 by rhynzy

[JM_Vocals]

Thanks for the help

Chromosomes are thread-like molecules that carry hereditary information for everything from height to eye color. They are made of protein and one molecule of DNA, which contains an organism’s genetic instructions, passed down from parents.

[claudepa]

Human cells have 23 pairs of chromosomes. They are numbered from 1 to 22 and then sexual chromosomes XX for girls XY for boys. In each pair of chromosome one is a copy of a father chromosome and one is a copy of a mother chromosome. These chromosomes contain 22000 genes, but these genes constitute only 1 % of the DNA. Thanks to this mixing of mother and father sequences it is considered that when looking at the DNA sequence (3 billions A,T,G, C) each human being is unic. with the exception of course of true twins. And even for true twins there is some debate to my knowledge. This would be very important, if confirmed, because many data about the role of heredity are based on the study of true twins: type and age of disease for instance. The "best" true twins for researchers are those who have been separated after birth (I suppose there are not so many). Because they are supposed to have exactly the same heredity but a different environnment in their life.