Why do chimps have 48 chromosomes and humans 46?
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).
How humans are evolved from the apes?
There’s a simple answer: Humans did not evolve from chimpanzees or any of the other great apes that live today. We instead share a common ancestor that lived roughly 10 million years ago.
Why do apes have 24 chromosomes and humans have 23?
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.
How many auto chromosomes do humans have?
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females.
Can humans have 44 chromosomes?
But it is also possible to go down to 44. To get to the more stable 44 chromosomes, the most likely route is for two people with the same balanced translocation to have a child together. This can happen when two closely related people have kids.
Can evolution change the number of chromosomes?
Explanation: The present species in the world have vastly different genetic material and number of chromosomes. If the origin of the species is one common ancestor then the number of chromosomes and genetic make up those chromosomes must change.
What is Auto some?
An autosome is one of the numbered chromosomes, as opposed to the sex chromosomes. Humans have 22 pairs of autosomes and one pair of sex chromosomes (XX or XY). Autosomes are numbered roughly in relation to their sizes.
Do you agree that humans had originated from apes?
Humans and monkeys are both primates. But humans are not descended from monkeys or any other primate living today. We do share a common ape ancestor with chimpanzees. It lived between 8 and 6 million years ago.
Can a person have more than 46 chromosomes?
Aneuploidy. A genetic condition where someone has either too many or two few chromosomes is called aneuploidy (AN-yoo-ploy-dee). A complete set of genetic information includes 23 pairs of chromosomes, which adds up to 46 chromosomes total.
Where did the Y chromosome evolve from in humans?
The human Y chromosome is intriguing not only because it harbours the master-switch gene that determines gender but also because of its unusual evolutionary history. The Y chromosome evolved from an autosome, and its evolution has been characterized by massive gene decay.