How many chromosomes are there in a human body cell?

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lynn30k's profile pic

lynn30k | High School Teacher | (Level 1) Educator

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I have to correct the first answerer--the "normal" number of 46 chromosomes is the DIPLOID number, not the haploid. In egg and sperm cells, half the number is present, and this is known as the haploid number.

In some individuals, the diploid number is off; this is known as either a monosomy (only one of the usual pair is present), or a trisomy (3 copies, instead of two). The most well-known trisomy is Trisomy 21--3 copies of the 21st pair, otherwise known as Down Syndrome. This is not always obvious simply from counting chromosomes in a karyotype, as the extra material can be attached to another chromosome. Extra/missing X or Y chromosomes are other common genetic mistakes.

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sanjeetmanna | College Teacher | (Level 3) Assistant Educator

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There are 46 chromosomes that is 23 pairs of chromosomes that is 22 pair of autosomes and 1 pair of sex chromosomes.

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aimeevd | (Level 1) Adjunct Educator

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23 pairs of chromosomes, which results in 46 chromosomes.  22 of the pairs are automsomes, while 1 pair in the sex chromosomes (which XX results in a female and XY results in a male).

I would like to clarify that sometimes people can have more or less than 46 chromosomes is not due to mutation, but rather nondisjunction.  Basically it is caused by improper division of chromosomes during meiosis.  The only time someone can survive from nondisjunction (result in a vilable baby) is when the person has an extra chromosomes 21, or an extra sex chromosomes.  Also one may survive with only 1 X chromosome or missing part of chromosome 5.

Extra chromosome 21:  Down Syndrome

Missing a partial Chromosome 5:  Cri du chat Syndrome (aka Cat's Cry)

XXX:  Tripe X Syndrome 

X: Turner's Syndrome

XYY:  XYY Syndrome 

XXY:  Klinefelter's Syndrome

 

selmasharafaz's profile pic

selmasharafaz | College Teacher | (Level 3) Adjunct Educator

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46 chromosomes.

ie, 23 pairs of which 22 pairs are autosomes and 1 pair of sex chromosomes.

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joe-volk | Student, Undergraduate | (Level 3) Associate Educator

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Humans have diploid cells, meaning each one contains two copies of each chromosome. The number of unique chromosomes, including sex chromosomes, is 23 in humans. This is the n, or haploid number. 2n, or the diploid number is 46, and refers to the actual number of chromosomes in a human cell, including the duplicates.

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drahmad1989 | Student, Undergraduate | (Level 1) Valedictorian

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46 chromosomes in human's cell. And all these are in form of pairs ,so 23 pairs of chromosomes in human body cell.

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gatsby94 | Student, Undergraduate | (Level 1) Honors

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there are 46 chromosomes in a cell and they are matched up in 23 pairs one of those pairs contains your genderchromosomes xy or xx

there are certain mutation such as down syndrome where you have 47 chromosomes or less than 46 chromosomes

chavda211's profile pic

chavda211 | Student | (Level 1) Salutatorian

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There are 46 chromosomes in a cell. However if these were put into pairs then there would be half the number of single chromosomes- there would be 23 pairs.

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debashreebanerjee | Student, Grade 10 | (Level 1) Honors

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There are 22 pairs of autosomes( chromosomes which are responsible for any feature in the body other than sex determination) and 1 pair of allosomes or sex chromosomes( wwhich determines the sex of an individual). Therefore there is a total of 23 pairs of chromosome in a human body cell.

However the human gametes formed by meiosis have haploid number of chromosomes i.e. they have only 23 chromosomes instead of 46; so that after fertilization the zygote has 23 pairs of chromosome(23 from the sperm and 23 from the ovum).

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garimagupta2210 | Student, Undergraduate | (Level 1) eNoter

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There are 46 chromosomes in a cell and they are matched up in 23 pairs one of those pairs contains your gender chromosomes xy or xx

there are certain mutation such as down syndrome where you have 47 chromosomes or less than 46 chromosomes

shruthiblues27's profile pic

shruthiblues27 | Student | (Level 1) Honors

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There are 23 pairs(46 chromosones)of chromosones in a human body cell.

In females the sex chromosone is XX and in males it is XY

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