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Chromosomes
Chromosomes contain the genetic material DNA
1,309 Questions
What is the classification of chromosomes?
One classification of chromosomes is into circular and linear. Prokaryotes have circular chromosomes, but they are not geometrically circular - better to say they are in the form of a loop, so that the DNA has no end. Eukaryotic cells have linear chromosomes in the nucleus, but circular chromosomes in mitochondria and chloroplasts, probably reflecting their origins as independent prokaryotes.
Another classification is into sex chromosomes and autosomes. Sex chromosomes are responsible for sex determination in some, but not all, organisms. In humans the sex chromosomes are called X and Y, and the female is the homogametic sex (because all gametes must carry an X), while the male is the heterogametic sex (XY). In birds it is the other way round: the male is homogametic (WW) and the female heterogametic (WZ).
Another form of classification is to number the autosomes. This is done with Arabic numerals, starting with the longest chromosome. Thus the longest human chromosome is chromosome 1, the next longest is chromosome 2, and so on. Unfortunately early microscopists incorrectly ranked the two smallest, and the Human Genome Project found that chromosome 22 is actually longer than chromosome 21, but the names have stuck.
What is the defintion of chromosome?
A chromosome is a thread-like structure made of DNA and proteins found in the nucleus of a cell. It contains the genetic information that determines an organism's traits. Humans typically have 23 pairs of chromosomes.
The human X and Y Chromosomes are what?
The human X and Y chromosomes are:
- both present in every somatic cell of males and females.
- approximately equal in size.
- almost entirely homologous, despite their different names.
- called "sex chromosomes" because they determine an individual's sex.
Chromosomes are formed from long strands of DNA that are tightly coiled and packaged with proteins called histones. This coiling and packaging help to condense the DNA in order to fit within the cell nucleus and ensure proper organization during cell division.
Humans have thousands of different genes arranged on 23 pairs of chromosomes. These are arranged from largest to smallest on a karyotype.
Uh, hi I read your answer, and I think you misspelled a word.
-anonymous.
What is a chromosome made up of?
Chromosomes are made of a single strand of DNA. There are also some proteins that are bound to this DNA in order to manage it and keep it coiled, these are also sometimes referred to as part of the chromosome.
A sat chromosome, short for satellite chromosome, is a chromosome with a secondary constriction that contains highly repetitive DNA sequences called satellite DNA. These regions appear as small, secondary appendages on the chromosome and play a role in chromosome structure and organization.
When are Chromosomes not visible?
Chromosomes are not visible during the interphase stage of the cell cycle when they are in their less condensed form. Additionally, chromosomes may not be visible if the cell is not actively dividing or if they are not stained for observation under a microscope.
Chromosomes are made out of what molecule?
Chromosomes are DNA, which is made of sequences of nucleotides. Also there are some supporting factors such as proteint which help with it's structure and functioning. Nucleotides are molecules with a carbon-skeleton structure, about 3 small rings in size each. They bind in strings to other nucleotides quite strongly. One string binds less strongly to another string, but only if the nucleotides match (largely). In DNA there are four nucleotides, Adenine and Thymine which match, and Guanine and Cytosine which match.
the organelle that contains the chromosomes would be the nucleus. Inside of the nucleus where the actual chromosomes are is the nucleolus.
What is a haploid number of chromosomes?
Diploid is the full set of chromosomes - one of each from each parent.
Haploid is just the set from one parent (half the total).
The number varies in different animals. In humans the full diploid number is 46 and the haploid number is 23.
A lion sperm has 18 chromosomes and a tiger egg has 33 chromosomes how they can be crossed?
Ligers are hybrid offspring of a male lion and a female tiger. They inherit 17 chromosomes from the lion and 16 chromosomes from the tiger, resulting in a total of 33 chromosomes. This is possible due to a phenomenon called chromosomal pairing during meiosis, where homologous chromosomes from each parent pair up and segregate into gametes.
How many chromosomes are in a cell?
The number of chromosomes vary depending on species. Human cells have 23 pairs = 46 chromosomes. A cow cell has 2 x 30 = 60 A horse cell has 2 x 32 = 64 A goldfish has approximately 100
23 are in sex cells and then 46 in body cells
Chromosomes are thread-like structures made of DNA and proteins found in the nucleus of a cell. They contain the genetic information needed for cell growth, development, and functioning. In humans, chromosomes come in pairs, with one set inherited from each parent.
What is a list of the 3 parts of a chromosome?
Telomere - The ends of the chromosome.
Centromere - The primary constriction of the chromosome.
Chromatid - A single molecule of DNA.
The centromere also divides the chromosome into a short arm (p) and a long arm (q).
Rabbits have 22 pairs of chromosomes, totaling 44 chromosomes in total. This includes one pair of sex chromosomes (XX in females and XY in males). The chromosomes contain the genetic material that determines an individual rabbit's characteristics and traits.
How many chromosomes does a cell of the testes have?
A cell of the testes, called a spermatocyte, has 46 chromosomes in humans. This includes 23 pairs of chromosomes, one set inherited from each parent. During the process of meiosis, the number of chromosomes is halved to 23 to create sperm cells.
How many chromosomes do chimps have?
It depends on the species of monkey! There is considerable variety.
Here are a few monkey diploid chromosome numbers:
capuchin monkey 54
owl monkey male 49; female 50
red howler monkey 47, 48, or 49 (an unusual system!)
rhesus monkey 42
squirrel monkey 44
How many chromosomes do frogs have?
Frogs typically have around 26 chromosomes in their cells, although the number can vary between different species of frogs.
A brain cell has how many chromosomes?
All cells in the human body - with the exception of the gametes (sex cells) contain 23 pairs of chromosomes; therefore 46 chromosomes in total. In the gametes (ova for women; sperm for men), each cell has only 23 single chromosomes. Thereby allowing the ova from mom containing 23 singles and the sperms from dad containing 23 singles to combine together to make a unique new formation of 23 pairs in a new life.
Chromosomes are moved during cell division by a structure called the mitotic spindle. The spindle is made up of microtubules that attach to the chromosomes and help to pull them apart to ensure each daughter cell receives the correct number of chromosomes. This movement is critical for faithful segregation of genetic material.
What do the bands on chromosomes signify?
The bands on chromosomes are regions of condensed DNA that are stained differently to create a visible pattern. These bands help scientists identify and locate specific genes on the chromosomes. The patterns of bands can also reveal genetic abnormalities or structural rearrangements in the chromosomes.
What part of the cell that contains chromosomes?
The nucleus is the part of the cell that contains chromosomes. It serves as the control center of the cell and houses the genetic material in the form of DNA.
Tell me what a replicated Chromosome?
A replicated chromosome is a chromosome that has been copied during the S phase of the cell cycle, resulting in two identical sister chromatids joined at the centromere. This duplication ensures that each daughter cell receives a complete set of genetic material during cell division.
