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Why is Chromosome 1 called Chromosome 1?

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Chromosome 1 is the designation for the largest human chromosome. Humans have two copies of chromosome 1, as they do with all of the autosomes, which are the non-sex chromosomes. Chromosome 1 spans about 249 million nucleotide base pairs, which are the basic units of information for DNA. It represents about 8% of the total DNA in human cells.

Why is Chromosome 1 called Chromosome 1? Is being the largest human chromosome the only reason?

chromosome

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$begingroup$

Chromosome 1 is the designation for the largest human chromosome. Humans have two copies of chromosome 1, as they do with all of the autosomes, which are the non-sex chromosomes. Chromosome 1 spans about 249 million nucleotide base pairs, which are the basic units of information for DNA. It represents about 8% of the total DNA in human cells.

Why is Chromosome 1 called Chromosome 1? Is being the largest human chromosome the only reason?

chromosome

share|improve this question

asked 8 hours ago

fu DLfu DL

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$begingroup$

Chromosome 1 is the designation for the largest human chromosome. Humans have two copies of chromosome 1, as they do with all of the autosomes, which are the non-sex chromosomes. Chromosome 1 spans about 249 million nucleotide base pairs, which are the basic units of information for DNA. It represents about 8% of the total DNA in human cells.

Why is Chromosome 1 called Chromosome 1? Is being the largest human chromosome the only reason?

chromosome

share|improve this question

asked 8 hours ago

fu DLfu DL

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fu DL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this question

asked 8 hours ago

fu DLfu DL

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share|improve this question

asked 8 hours ago

fu DLfu DL

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asked 8 hours ago

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2 Answers
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Chromosomes were first known about from karyograms (that's the word for chromosome pictures like these) sort of like this one (1)(2):

The scientists looking at these chromosomes didn't know much about them at first. They were discovered before anything was understood about genes, but by 1922 it was thought they were the carriers of genes. Without much understanding of the chromosomes, and certainly no understanding of what they carried, scientists needed an easy way to order and compare them. They chose a straight forward option - size - and paired them up and then lined them up biggest to smallest. Because the sex chromosomes didn't fit into this scheme of matching pairs they were left to the end.

Hence Chromosome 1 is Chromosome 1 because it is the largest autosomal chromosome.

Notes:

1. The actual first karyogram was of a plant, this one is of a human male.


2. The image above is public domain, obtained from Wikipedia, and originally made by the National Human Genome Research Institute.

share|improve this answer

edited 4 hours ago

answered 6 hours ago

Jack AidleyJack Aidley

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• 
  
  
  

  
  

  
  
  
  
  
  

  
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  @user1136 Karyograms were first made in 1842 before Mendel's famous experiments so I'd say before genes too
  $endgroup$
  – Jack Aidley
  4 hours ago
  

  
  
  
  

add a comment | 

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Yes; for the most part, chromosomes are numbered by size.

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answered 8 hours ago

swbarnes2swbarnes2

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3

$begingroup$

Chromosomes were first known about from karyograms (that's the word for chromosome pictures like these) sort of like this one (1)(2):

The scientists looking at these chromosomes didn't know much about them at first. They were discovered before anything was understood about genes, but by 1922 it was thought they were the carriers of genes. Without much understanding of the chromosomes, and certainly no understanding of what they carried, scientists needed an easy way to order and compare them. They chose a straight forward option - size - and paired them up and then lined them up biggest to smallest. Because the sex chromosomes didn't fit into this scheme of matching pairs they were left to the end.

Hence Chromosome 1 is Chromosome 1 because it is the largest autosomal chromosome.

Notes:

1. The actual first karyogram was of a plant, this one is of a human male.


2. The image above is public domain, obtained from Wikipedia, and originally made by the National Human Genome Research Institute.

share|improve this answer

edited 4 hours ago

answered 6 hours ago

Jack AidleyJack Aidley

5,9572222 silver badges4444 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @user1136 Karyograms were first made in 1842 before Mendel's famous experiments so I'd say before genes too
  $endgroup$
  – Jack Aidley
  4 hours ago
  

  
  
  
  

add a comment | 

3

$begingroup$

Chromosomes were first known about from karyograms (that's the word for chromosome pictures like these) sort of like this one (1)(2):

The scientists looking at these chromosomes didn't know much about them at first. They were discovered before anything was understood about genes, but by 1922 it was thought they were the carriers of genes. Without much understanding of the chromosomes, and certainly no understanding of what they carried, scientists needed an easy way to order and compare them. They chose a straight forward option - size - and paired them up and then lined them up biggest to smallest. Because the sex chromosomes didn't fit into this scheme of matching pairs they were left to the end.

Hence Chromosome 1 is Chromosome 1 because it is the largest autosomal chromosome.

Notes:

1. The actual first karyogram was of a plant, this one is of a human male.


2. The image above is public domain, obtained from Wikipedia, and originally made by the National Human Genome Research Institute.

share|improve this answer

edited 4 hours ago

answered 6 hours ago

Jack AidleyJack Aidley

5,9572222 silver badges4444 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @user1136 Karyograms were first made in 1842 before Mendel's famous experiments so I'd say before genes too
  $endgroup$
  – Jack Aidley
  4 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

Chromosomes were first known about from karyograms (that's the word for chromosome pictures like these) sort of like this one (1)(2):

The scientists looking at these chromosomes didn't know much about them at first. They were discovered before anything was understood about genes, but by 1922 it was thought they were the carriers of genes. Without much understanding of the chromosomes, and certainly no understanding of what they carried, scientists needed an easy way to order and compare them. They chose a straight forward option - size - and paired them up and then lined them up biggest to smallest. Because the sex chromosomes didn't fit into this scheme of matching pairs they were left to the end.

Hence Chromosome 1 is Chromosome 1 because it is the largest autosomal chromosome.

Notes:

1. The actual first karyogram was of a plant, this one is of a human male.


2. The image above is public domain, obtained from Wikipedia, and originally made by the National Human Genome Research Institute.

share|improve this answer

edited 4 hours ago

answered 6 hours ago

Jack AidleyJack Aidley

5,9572222 silver badges4444 bronze badges

$endgroup$

share|improve this answer

edited 4 hours ago

answered 6 hours ago

Jack AidleyJack Aidley

5,9572222 silver badges4444 bronze badges

answered 6 hours ago

Jack AidleyJack Aidley

5,9572222 silver badges4444 bronze badges

answered 6 hours ago

Jack AidleyJack Aidley

5,9572222 silver badges4444 bronze badges

2

$begingroup$

Yes; for the most part, chromosomes are numbered by size.

share|improve this answer

answered 8 hours ago

swbarnes2swbarnes2

3,77388 silver badges1111 bronze badges

$endgroup$

add a comment | 

2

$begingroup$

Yes; for the most part, chromosomes are numbered by size.

share|improve this answer

answered 8 hours ago

swbarnes2swbarnes2

3,77388 silver badges1111 bronze badges

$endgroup$

add a comment | 

$begingroup$

Yes; for the most part, chromosomes are numbered by size.

share|improve this answer

answered 8 hours ago

swbarnes2swbarnes2

3,77388 silver badges1111 bronze badges

$endgroup$

share|improve this answer

answered 8 hours ago

swbarnes2swbarnes2

3,77388 silver badges1111 bronze badges

answered 8 hours ago

swbarnes2swbarnes2

3,77388 silver badges1111 bronze badges

answered 8 hours ago

swbarnes2swbarnes2

3,77388 silver badges1111 bronze badges