What is a chromosome trait?
A chromosome contains hundreds to thousands of genes. Every normal human cell contains 23 pairs of chromosomes, for a total of 46 chromosomes. A trait is any gene-determined characteristic and is often determined by more than one gene.
What are examples of genetic traits?
For example, their hair color or their blood type. Traits are determined by genes, and also they are determined by the interaction with the environment with genes.
What are 2 chromosomes called?
Chromatid Following DNA replication, the chromosome consists of two identical structures called sister chromatids, which are joined at the centromere.
What is the normal number of chromosomes?
Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell. A change in the number of chromosomes can cause problems with growth, development, and function of the body’s systems.
What does each chromosome determine?
An organism has the same chromosomes for its entire life. The chromosomes are located within each cell nucleus. They provide the directions for how the cell is supposed to function and determine some characteristics about how the individual looks. Each chromosome contains a very complex molecule called DNA.
What are the 23 chromosome pairs?
The chromosomes of the 23rd pair are called allosomes consisting of two X chromosomes in most females, and an X chromosome and a Y chromosome in most males. Females therefore have 23 homologous chromosome pairs, while males have 22. The X and Y chromosomes have small regions of homology called pseudoautosomal regions.
What is a normal chromosome?
In humans, the normal number of chromosomes is 46, appearing in 23 pairs. Each pair of chromosomes stores distinct information, and any damage to a chromosome can cause serious problems for the parent organism. Errors usually occur during cell division, creating gaps in the genetic material in the chromosome.
