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Chromosomes
Chromosomes contain the genetic material DNA
1,309 Questions
What is bigger than a chromosome?
A molecule. elements are a series of atoms that form an element and several elements form a molecule.
What is homologous chromosomes frequently exchange portions of their DNA called?
It's called crossing over, and it generally only happens between homologous chromosomes.
A male child will inherit what chromosome?
Most males have XY chromosomes while most females have XX chromosomes.
How do differ chromatids differ from homologous chromosomes?
Sister chromatids are identical while homologous chromosomes are merely similar.
They are different because they separate the cells and then they become babies but only the homologous chromosomes do.
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.
Each half is called a sister chromatid.
There is much more DNA in the X chromosome. The Y has genes for addition growth and most of the testosterone that the body makes. A person can live with only one X but here are no people without the X and only the Y.
What chromosome is the BRCA2 gene on?
Breast cancer, as all cancers, is highly complex and caused by mutations in numerous genes - each cancer, however, will likely have different gene mutations.
However, there are some genes which are commonly mutated in a small proportion of breast cancers (a mutation in these genes shows increased susceptibility in a number of families) - the most commonly referred to are BRCA1 and BRCA2.
BRCA1 is found on 17q21 (chromosome 17, q arm, band 21) and BRCA2 on 13q12.
A segment of chromosome responsible for a particular characteristic?
DNA or genens these are the segments of the chromosome.
What is the chance that a zygote will receive one x chromosome and one y chromosome?
The chance is 50%.
What do dark bands in the chromosome indicate?
When DNA coils into a chromosome, it keeps its shape with the help of associated proteins. Where the DNA is very tightly coiled, and the proteins very condensed, that region appears as a dark band (G-band). G-bands are not very rich in genes, which means that it's ok that the DNA is tightly coiled, because it does not have to be very accessible anyway. Note that these bands are only visible when certain types of dye are used. Other types of dye will case gene-rich regions to stain darker and gene-poor regions to stain more brightly. See also: Chromosomes: Organization and Function By Adrian Thomas Sumner, 10.2.2
Why do chromosome have an x -shape?
chromatids have centraly located centriols which gives them U shape. they are attached together by a centromere resulting in X
8. 2^3
Chromosome are a structure in a cell's nucleus that contains hereditary material.
What is a picture called of all the chromosome in a cell?
A picture of chromosomes is called a "karyotype."
What is chromosome half come from?
Each half of your DNA (DeoxyriboNucleic Acid) comes from your parents. A genetic mutation is a permenent change in your DNA.
Is it True or false that chromosomes which carry genes are found in the nucleus of the cell?
True.
Mitochondria contain their own DNA - and the chromosomes present in mitochondria are much smaller than those found in the nucleus (they are much more similar to Prokaryotic chromosomes). Mitochondrial DNA is not involved in the central processes of the cell.
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Which pair of chromosomes can be different in size and banding pattern?
In humans, the twenty-third chromosome is different than the others. The last pair indicates whether male or female; this is why they are different
How many chromosomes do protists have?
Protists can have a wide range of chromosome numbers, which can vary from species to species. They may have a haploid number (n) or a diploid number (2n) or other variations, depending on the specific protist.
