How many chromosomes do humans have?

Question

I want to know how many chromosomes humans have.

Answer 1

They have 23 unique chromosomes total. In a cell there are two copies of each chromosome, as written 2n. So therefore there are 46 chromosomes in a cell when not dividing. Then there are the X and Y chromosomes, and either an X Y or an XX per cell.

Answer 2

In general, humans have 46 chromosomes in each diploid somatic cell, so 2n = 46. These come in 23 pairs. The autosomes are numbered 1-22, and the 23rd pair are the sex chromosomes X and Y. Typically biological females are XX and biological males are XY. Human gametes, eggs and sperm, are haploid cells, each containing one copy of each chromosome, so n = 1. (n refers to the number of sets of chromosomes.)

Answer 3

Human beings have 23 pairs of chromosomes, since they are in pairs the total number of chromosomes is forty six. This is the normal number. There are individuals that unfortunately have extra copies of chromosomes but this leads to problems for the person, for example people with one extra chromosome on a pair of chromosomes making it a triplet (three chromosomes instead of two) have Down syndrome. Remember when cells divide the chromosomes split in half and replicate so each new cell has a complete set of twenty three chromosomes.

Answer 4

46. 

Note that the size of an organism hasnothing to do with its chromosome number.  (I find this interesting.)  A shrimp has 254 and a horse has 66.  Weird huh.....

Answer 5

Human have total 46 chromosomes i.e. 23 pairs. In males it is 22 pairs of autosomes +X and Y chromosomes and in females it is 22 pairs of autosomes + a pair of X chromosomes.

Answer 6

Humans typically have 46 chromosomes in each somatic cell, forming 23 pairs. These include:

1. 22 pairs of autosomes, which are the same in both males and females.
2. 1 pair of sex chromosomes: females have XX, males have XY.

Chromosomal abnormalities are variations from the typical number or structure of chromosomes and can be broadly grouped into:

A. Numerical Abnormalities (Aneuploidy)

1. Trisomy: An extra chromosome (3 instead of 2).
2. Down syndrome (Trisomy 21) — extra chromosome 21.
3. Trisomy 18 (Edwards syndrome) and Trisomy 13 (Patau syndrome) — other examples.
4. Monosomy: Missing a chromosome.
5. Turner syndrome — a female has only one X chromosome (45, X0).

Sex Chromosome Aneuploidies

1. Klinefelter syndrome (47, XXY) — male with an extra X chromosome.
2. Trisomy X (47, XXX) — female with an extra X.
3. XYY syndrome (47, XYY) — male with an extra Y.

The frequency of Down Syndrome is 1 in 700 live child births

In USA, each year approximately 5,700 children born with Down Syndrome according to CDC reports

Answer 7

Human beings have 23 pair of chromosomes i.e 46 chromosomes as whole . One set i.e 23 chromosome are from mother(female gamete) and another 23 chromosome are from Father(male gamete) . This is how when Two diploid organism intercourse then again a diploid organism is formed because they contribute only haploid content.

Answer 8

Human have 23 pairs of 46 unique chromosomes

Answer 9

46 chromosomes are present in total and if we talk about the pairs then there are 23 pairs of chromosomes.

Answer 10

46 chromosomes

Answer 11

Humans have 22 pairs of somatic chromosomes in the body and one set of sex chromosomes (XX or XY) giving you 23 pairs of chromosomes or 46 chromosomes total.

Answer 12

Human have 46 chromosomes in their cell . in other word 23 pairs of chromosomes.

some people have chromosomal diseases this is why because those people have incorrect arrangement of

X and Y chromosomes

Answer 13

Human has a total of 46 chromosomes, present in the form of pairs 23chromosomes comes from each parent. So, 23 pairs of chromosomes are present in humans.

Answer 14

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. The 23rd pair, the sex chromosomes, differ between males and females

Answer 15

Human contain 46 chromosomes in 23 pairs.

Answer 16

Humans have 46 chromosomes in total, with half coming from their mother and half from their father. Because we have two sets of chromosomes, we are also referred to as being "diploid" organisms.

Not all organisms have the same number of chromosomes that we do. Fruit flies, for example, have four chromosomes, and some species of toads have 33! These special types of toads are also unique because they have three sets of chromosomes, making them triploid organisms.

Answer 17

Human contain 46 chromosomes in 23 pairs.

Answer 18

46 chromosomes

Humans have 46 chromosomes that occur in 23 pairs in somatic cells and gametes respectively. The chromosomes in somatic cells are diploid while in gametes are haploid. the 46 chromosomes are due to mitosis and 23 pairs are due to meiosis.

Answer 19

We have 46 chromosomes. They come as 23 pairs.