A single strand of bunched up DNA
You can find some explanations at imdb.com
A spasm of the diaphragm
A Trisomy 1. Another said this was Down's Syndrome.
No, some bacteria and other unicellular organisms have a single chromosome
An auto-some is any of the 23 chromosomes which is not an X or Y chromosome. A sex chromosome is effectively the same as an auto-some, apart from depending upon whether you inherit a Y chromosome or not, a sex chromosome will determine your gender. Hence the name. -By SciienceFreak
Yes, animals have chromosome 21. It may vary in size or gene content depending on the species. In humans, chromosome 21 is associated with conditions such as Down syndrome.
Yes, it can. This new chromosome, which is mostly chromosome 22 with a piece of chromosome 9 stuck to it. It is called the Philadelphia chromosome and can cause chronic myelogenous leukemia (CML) as well as some cases of acute lymphocytic and myelogenous leukemia (ALL and AML).
No, not all sex-linked traits are located on the X chromosome. Some sex-linked traits can also be located on the Y chromosome.
The Y chromosome is smaller than the X chromosome and contains fewer genes. It carries the genes necessary for determining male sex and some other genes, but it lacks many of the genes present on the X chromosome. This is why the Y chromosome does not carry any alleles in the same way that the X chromosome does.
No, not all cases of Down syndrome involve a complete extra chromosome. The most common form, known as trisomy 21, consists of an entire extra chromosome 21, resulting in three copies instead of the usual two. However, some cases are due to a Robertsonian translocation, where a part of chromosome 21 is attached to another chromosome, or mosaic Down syndrome, where some cells have the extra chromosome while others do not.
DNA is primarily stored in the chromosome within the cell nucleus. Some DNA is also present in the mitochondria, which are located in the cytoplasm.
It is the sperm that fertilizes the egg that will determine the sex of your baby. Some sperm carry the X-chromosome and some sperm carry the Y-chromosome. If an X-chromosome-carrying sperm fertilizes the egg, the baby will be a girl. If a Y-chromosome-carrying sperm fertilizes the egg, the baby will be a boy.