Placement of chromosomes from each parent on dna

[ARAVIND113122]

is dna in a sexually reproducing organism one single chain with dna from one parent coming first,with the other parent's dna joining it as it ends.or do the two strands lie side by side,without joining.Or do they lie side by side and join at some point?

the purpose of asking the question is to know whether homologous chromosomes lie close to each other or are distant from each other??

 

[mishrashubham]

is dna in a sexually reproducing organism one single chain with dna from one parent coming first,with the other parent's dna joining it as it ends.or do the two strands lie side by side,without joining.Or do they lie side by side and join at some point?

the purpose of asking the question is to know whether homologous chromosomes lie close to each other or are distant from each other??

DNA in the G₀ or G₁ phases is wrapped around nucleosomes and exists in the form of chromatin threads. This is a tangled mess; the chromosomes aren't neatly organised in rows and columns inside the nucleus, so saying that the chromosomes lie close together or far apart doesn't actually make sense. No homologous chromosomes are not joined together either; they are two different strands independent of each other.

 

[Ygggdrasil]

DNA in the G_{0[/sun] or G1 phases is wrapped around nucleosomes and exists in the form of chromatin threads. This is a tangled mess; the chromosomes aren't neatly organised in rows and columns inside the nucleus, so saying that the chromosomes lie close together or far apart doesn't actually make sense.}

<sub>New research actually suggests that the chromatin of different chromosomes are organized spatially within the nucleus. While the chromosomes do not display as much organization as they do when condensed during mitosis, during interphase, the chromosomes appear to localize to specific "chromatin territories" and researchers have often found that the territories of certain chromosomes often lie next to each other. The details of chromatin territory organization differ between cell types however. See the link at the bottom of the post for more details.

I'm not sure if anyone has looked at how the territories of homologous chromosomes are organized. Perhaps following some links from the site below can shed some light on the issue.

http://www.nature.com/scitable/topi...tories-the-arrangement-of-chromosomes-in-3025</sub>

 

[mishrashubham]

New research actually suggests that the chromatin of different chromosomes are organized spatially within the nucleus. While the chromosomes do not display as much organization as they do when condensed during mitosis, during interphase, the chromosomes appear to localize to specific "chromatin territories" and researchers have often found that the territories of certain chromosomes often lie next to each other. The details of chromatin territory organization differ between cell types however. See the link at the bottom of the post for more details.

I'm not sure if anyone has looked at how the territories of homologous chromosomes are organized. Perhaps following some links from the site below can shed some light on the issue.

http://www.nature.com/scitable/topi...tories-the-arrangement-of-chromosomes-in-3025

Intriguing! It'd be interesting to see how well defined these territories are and what effect this form of spatial organization within the nucleus has on gene expression. Also, according to this (link), territories of homologous chromosomes in mammalian cells are generally not adjacent.

 

[LudusRex]

In sexually reproducing organisms, the DNA is arranged in a double helix structure, with two strands of DNA running parallel to each other. Each strand contains a sequence of nucleotides that make up the genetic code. During sexual reproduction, each parent contributes one set of chromosomes, which contain the DNA, to the offspring. These chromosomes are arranged in pairs, with one chromosome coming from each parent.

The two strands of DNA do not lie side by side without joining. Instead, they are connected by hydrogen bonds between complementary base pairs (adenine with thymine, and guanine with cytosine). This allows for DNA replication and the accurate transmission of genetic information to the offspring.

The placement of chromosomes from each parent on DNA is random and not predetermined. During cell division, the chromosomes from each parent are randomly distributed to the daughter cells, ensuring genetic diversity in the offspring. Therefore, homologous chromosomes may lie close to each other or be distant from each other, depending on chance.

In summary, the two strands of DNA in sexually reproducing organisms are not separate and joined at some point, but rather they are connected by hydrogen bonds and form a double helix structure. The placement of chromosomes from each parent is random, resulting in homologous chromosomes lying close to each other or being distant from each other. This allows for genetic diversity and ensures the accurate transmission of genetic information to the offspring.