There are 23 chromosomes in each human?

Answer 1

That's correct notwithstanding individuals who have extra chromosomes. It's recognised as 23 chromosome pairs. The pairs consist of 2 identical chromosomes - i.e. 46 chromosomes in total.

Two sister chromatids form a chromosome. There are 22 pairs of autosomes and 1 pair of gonosomes (also known as the sex chromosomes). The only difference between the male and female is the length of one of the chromosomes: Y is much shorter than X. So, it is in fact differences in the 23rd chromosome that determine if a human will be male or female.

Additional point: Down's Syndrome is also known as trisomy 21. An extra chromosome resembling the 21st can be observed in individuals with this condition = they have 47 chromosomes in total. Individuals with less than 46 chromosomes are said to have a condition known as monosomy.

Try checking out the following website if you want more information: http://learn.genetics.utah.edu/units/disorders/karyotype/karyotypeinfo.cfm

Hope this clears up the confusion of the other postings.

Answer 2

Most people have 23 chromosome p a i r s making 46 chromosomes altogether.

Answer 3

Actually, 23 pairs of chromosomes (disregarding some deviations like Down Syndrom or extra or less than normal X or Y chromosomes).

Answer 4

Nope, you have more cells than that, and each cell has a lot of chromosomes. Now begin counting your cell, I'll tell you how many chromosomes you have when you're done.

23 pairs of chromosomes is normal, but it is possible to have an extra without ill effect (or have one less), down's syndrome is one of those that gives obviously bad effect.

Answer 5

Yes, each living cell in your body has its own set of 23 pairs of chromosomes. They're the same in every cell, though, so when talking about genetics, we can treat it like your entire body has 23 pairs. In other words, Chromosome 3 in a cell in your arm is exactly the same as Chromosome 3 in a cell in your brain. That means that I can talk about a gene on Chromosome 3 without having to specify which cell, tissue, or organ it comes from. The expression of the gene (whether the gene is turned "on" or "off") will differ from cell to cell, but the actual chromosome itself is the same.

Answer 6

The answer of course is trillions. Each cell has 46 chromosomes, and you have trillions of cells in your body.

Answer 7

there are 23 different chromosomes in females(22 pairs of autosomes and one pair of X chromosome) & 24 in males
(22 pairs of autosomes and X and Y sex chromosomes)

Answer 8

it's actually 46 but they separate into 23.