Humans have 46 chromosomes, whereas chimpanzee, gorilla, and orangutan have 48. This major karyotypic difference was caused by the fusion of two ancestral chromosomes to form human chromosome 2 and subsequent inactivation of one of the two original centromeres (Yunis and Prakash 1982).
Why do humans have 46 chromosomes but all the other great apes have 48 like gorillas?
While great apes all have 48 chromosomes (24 pairs), humans have only 46 (23 pairs). … Scientists offered two possible explanations for the discrepancy: Either the common ancestor had 24 pairs, and humans carry a fused chromosome; or the ancestor had 23 pairs, and apes carry a split chromosome.
What if a person has 47 chromosomes?
A trisomy is a chromosomal condition characterised by an additional chromosome. A person with a trisomy has 47 chromosomes instead of 46. Down syndrome, Edward syndrome and Patau syndrome are the most common forms of trisomy.
What happens if you have 45 chromosomes?
There are 2 types of Turner syndrome: monosomy X TS and mosaic TS. About half of all girls with Turner syndrome have a monosomy disorder. Monosomy means that a person is missing one chromosome in the pair. Instead of 46 chromosomes, the person has only 45 chromosomes.
Can a human have 24 chromosomes?
In 1923 he published his results. Sperm contained 24 chromosomes, so if there were an equal number coming from the egg then humans must have 48 chromosomes in total, 24 pairs. Case closed.
How long a DNA is distributed in your 46 chromosomes?
In a single human cell approximately two metre long thread of dna is distributed among its 46 chromosomes.