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10 votes
1 answer
207 views

What causes cells to inactivate one X-chromosome?

Normally, when a cell has two X-chromosomes (female genome), one is randomly inactivated. How does the cell detect that there are two X-chromosomes in the first place? Is there some kind of protein ...
F16Falcon's user avatar
  • 662
3 votes
2 answers
827 views

Do chromosomes change with time?

An offspring is 23 chromosomes of mother and 23 of father, if one of the mate learns say music after the birth of their first child— will their second offspring have better music skills than former? ...
Jayant's user avatar
  • 101
0 votes
1 answer
9k views

Do all chromosomes in one human body contains same genome? [duplicate]

As I understand it, each nucleus of a cell contains multiple chromosomes. Each chromosome has multiple DNAs. Each DNA contains some specific gene sequences. That sequence is called Genome. My ...
user avatar
15 votes
3 answers
3k views

Is the size of the genome across species roughly the same?

Chromosome number differs across species. Is the amount of DNA comparable between organisms, just being split into smaller chunks in those species with more chromosomes, or do species have different ...
Thaina's user avatar
  • 469
13 votes
1 answer
717 views

What limits chromosomal length?

What are the upper and lower limits for chromosome length? Are these limits different in different species or kingdoms? If there is any limit, which cellular or molecular factors are reasons?
MySky's user avatar
  • 2,274
6 votes
1 answer
1k views

Why is it harder to sequence plant genomes than animal genomes?

Plants seem to be less complex organisms than animals, but despite that there are less plant genomes sequenced. Is that because plant genomes are more complex, for example in terms of regulatory ...
Stacked's user avatar
  • 219
7 votes
4 answers
2k views

Chromosomes are of different size but why do all chromosomes have similar GC percentage?

When I browsed NCBI I saw a pattern: even if the chromosome sizes, number of genes, and number of proteins are different, GC% in chromosomes tend to be similar. The examples are linked below. Yeast, ...
grvpanchal's user avatar
2 votes
1 answer
2k views

What is the advantage of circular genomes for bacteria and linear genomes for other organisms?

Bacterial are a great group of organisms. They have circular genomes and never went toward linear genomes while other organisms show the opposite strategy and don't have circular genomes (disregarding ...
MySky's user avatar
  • 2,274
0 votes
1 answer
604 views

Would two species of yeast with similar genome sizes have the same number of genes or chromosomes?

Similar organisms generally have similar genome sizes. Given this, would two species of yeast have the same number of genes and chromosomes? Edit: Fixed with thanks to @daniel-standage
thomasrive's user avatar