Your question: Which chromosome is the longest and has the most genes 1 or 21?

Is Chromosome 1 the longest?

Two copies of chromosome 1, one copy inherited from each parent, form one of the pairs. Chromosome 1 is the largest human chromosome, spanning about 249 million DNA building blocks (base pairs) and representing approximately 8 percent of the total DNA in cells.

Which number of chromosome is longest and has the most genes?

That is, Chromosome 1, with the smallest number, is actually the largest chromosome. It has almost 3,000 genes on it.

Is chromosome 21 the largest?

Two copies of chromosome 21, one copy inherited from each parent, form one of the pairs. Chromosome 21 is the smallest human chromosome, spanning about 48 million base pairs (the building blocks of DNA) and representing 1.5 to 2 percent of the total DNA in cells.

Does Chromosome 1 have the most genes?

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
No. of genes 1,961 (CCDS)
Type Autosome
Centromere position Metacentric (123.4 Mbp)
Complete gene lists

Which chromosome has most genes?

The X chromosome is about three times larger than the Y chromosome, containing about 900 genes, while the Y chromosome has about 55 genes. Female mammals have two X chromosomes in every cell.

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Which is the largest gene?

The largest known gene is the human dystrophin gene, which has 79 exons spanning at least 2,300 kilobases (kb).

What happens if you have an extra chromosome 1?

1 duplication syndrome is a chromosomal disorder caused by duplication of a small piece of chromosome 1. The syndrome is characterized by features such as large head size, developmental delay, intellectual disabilities, typical facial features, cardiac problems, and seizures.

What type of chromosome is chromosome 21?

Chromosome 21 is both the smallest human autosome and chromosome, with 48 million base pairs (the building material of DNA) representing about 1.5 percent of the total DNA in cells.

Chromosome 21
Type Autosome
Centromere position Acrocentric (12.0 Mbp)
Complete gene lists
CCDS Gene list

What is chromosome 21 called?

Babies with Down syndrome have an extra copy of one of these chromosomes, chromosome 21. A medical term for having an extra copy of a chromosome is ‘trisomy. ‘ Down syndrome is also referred to as Trisomy 21.

Which chromosome has lowest number of genes?

The Y chromosome is one of the smallest chromosomes in humans. 5. It has the least number of genes that are approximately 55 genes and the X chromosome has about 900 genes.