When cells divide, the DNA has to share with them. That would be very difficult if over 40 delicate and long DNA molecules got tangled up. To avoid this problem, DNA is organized by being tightly wrapped around proteins until structures called chromosomes emerge. Sexually reproducing organisms such as monkeys have…

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When cells divide, the DNA must divide with them . That would be very difficult if over 40 delicate and long DNA molecules got tangled up. To avoid this problem, DNA is organized by being tightly wrapped around proteins until structures called chromosomes emerge. Sexually reproducing organisms like monkeys have two copies of each chromosome: one from the mother and one from the father. However, not all monkeys have the same number of chromosomes. A monkey’s diploid chromosome number depends on its haploid number, and its haploid number depends on the species.

Haploid and diploid chromosome number

The haploid number is the number of chromosomes in a gamete, e.g. B. a sperm or an egg cell. It is abbreviated as n. The diploid number is the number of chromosomes in a non-sex cell, e.g. B. the zygote, which results from a sperm cell fertilizing an egg cell. It is abbreviated as 2n. An organism’s diploid number is twice its haploid number because each parent receives a haploid set of chromosomes. Humans have a diploid number of 46 (2n = 46), which means that human gametes have a haploid number of 23 (n = 23). Other primates, such as B. monkeys, can have different haploid and diploid numbers that differ by species.

Monkeys with fewer chromosomes than humans

Rhesus monkeys and their close relatives in the genus Macaca have a diploid number of 42 and a haploid number of 21. Several spider monkeys also share chromosome numbers, with black faced, hooded spider monkeys and golden spider monkeys genus Ateles having a diploid number of 34 and a haploid number of 17. Squirrel monkeys have a diploid number of 44 and therefore a haploid number of 22. Some monkeys have the same chromosome number as humans, including marmosets, tailed tamarins, red titis, red uakaris, and saki monkeys.

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Monkeys with more chromosomes than humans

Capuchin ringtails and patas monkeys both have a diploid number of 54 and a haploid number of 27 Green monkeys and Diana monkeys both have a diploid number of 60 and a haploid number of 30. The diploid number in brown woolly monkeys is 64 a haploid number of 32. Some Old World monkeys have even more chromosomes than that, including the diademed guenon with a diploid number of 72. That’s more than three times the haploid number of a human.

Chromosome number in other primates

Other primates such as gibbons, lorikeets and our closest relatives, the great apes, also have different chromosome numbers. The great apes – orangutans, chimpanzees and gorillas – all have an extra set of chromosomes compared to humans, with a diploid number of 48 and a haploid number of 24. After the chimpanzee genome was sequenced in 2005, a comparison of the chromosomes revealed Evidence that human chromosome 2 results from the fusion of two chromosomes from a common ape ancestor. This research into chromosome numbers was used as evidence in the 2005 Dover creationism trial to crack down on intelligent design teaching in public schools.


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Chromosome Numbers During Division: Demystified!

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If the diploid number of an organism is 12, how many chromosomes will be present in each telophase

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If an organism’s diploid number is 12 its haploid number is?

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