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Theophilus Painter, one of the preeminent cytologists of the early twentieth century, estimated in 1923 that the number was 48. In 1956, improved techniques enabled researchers Joe Hin Tjio and Albert Levan to publish a paper stating that the number was 46. Within a year, Ford and Hamerton provided confirmatory data, reporting the diploid chromosome number in human testicular cells to be 46. See http://www.nature.com/scitable/topicpage/Human-Chromosome-Number-294 for interesting article.
What else can I help you with?
How many genes do cells obtain?
The number of genes varies from chromosome to chromosome and the number of chromosomes varies from species to species (from as few as 1 single chromosome per cell to as many 30,000 chromosome pairs per cell). Human cells have 23 chromosome pairs per cell.
Why does the nucleus of a fruit fly contain less chromosomes than the nucleus of a human?
Every species has a fixed number of chromosomes in its nucleus so every species has a different chromosome number from the other.
Why Chromosomes number is used in the identification of species?
Chromosome number is used in species identification because it is a stable and unique characteristic of a species. Variations in chromosome number can indicate genetic relationships between species, and can help distinguish between closely related species. Additionally, chromosome number is often conserved within a species, making it a useful tool for taxonomic classification.
How many genes does the chromosome carry?
The number of genes varies. Most of any chromosome consists of non-coding DNA, which does not contain any genes. Each chromosome has many chromatins. One gene consists of many chromatins. Therefore, one chromosome could have many genes.
What is the diploid chromosome number for a body cell from a human?
23
How many genes do cells obtain?
The number of genes varies from chromosome to chromosome and the number of chromosomes varies from species to species (from as few as 1 single chromosome per cell to as many 30,000 chromosome pairs per cell). Human cells have 23 chromosome pairs per cell.
What is the modal chromosome number?
The modal chromosome number refers to the most common number of chromosomes found within a particular species. It is essentially the number that occurs most frequently among individuals of that species.
Why does the nucleus of a fruit fly contain less chromosomes than the nucleus of a human?
Every species has a fixed number of chromosomes in its nucleus so every species has a different chromosome number from the other.
Why Chromosomes number is used in the identification of species?
Chromosome number is used in species identification because it is a stable and unique characteristic of a species. Variations in chromosome number can indicate genetic relationships between species, and can help distinguish between closely related species. Additionally, chromosome number is often conserved within a species, making it a useful tool for taxonomic classification.
How many genes does the chromosome carry?
The number of genes varies. Most of any chromosome consists of non-coding DNA, which does not contain any genes. Each chromosome has many chromatins. One gene consists of many chromatins. Therefore, one chromosome could have many genes.
What is the diploid chromosome number for a body cell from a human?
23
What ant species has the chromosome number 2n equals 4?
all ants
How many chromosome pairs are in a species with a haploid number of 68?
68 pairs .
Some species have the same chromosome number but they are different. Suggest an explanation?
Some species have same number of chromosomes but they are different. suggest an explanation
What is the chromosome number of cell shown in figure 10-4?
The chromosome number of a cell varies among species, but in humans, the typical number of chromosomes in a cell is 46 (23 pairs).
Does sperm contain x and y chromosome?
In humans the male sperm contains EITHER an X chromosome, or a Y chromosome since human gametes are haploid (n) in chromosome number.
How is the haploid chromosome number?
The haploid chromosome number is half the chromosome number of the body cells. For example, in humans, body cells have 46 chromosomes. In human haploid cells (sex cells), there are 23 chromosomes.
