Down’s syndrome is a genetic condition that happens because of the presence of an extra chromosome. It was first described in 1886 and is not classed as a disease as children do not suffer from Down’s syndrome. Although children with Down’s syndrome will have specific physical characteristics there are more differences than similarities amongst children ...
Molar pregnancies are not common. One of every 1000 pregnancies are molar pregnancies. A molar pregnancy means there is no fetus (in most cases). The problem begins with the egg rather than the sperm. Even in cases where the sperm grows normally (partial molar pregnancy) the fetus does not survive. The egg is defective and ...
Trisomy is a genetic disorder in which a child is born with all or part of an extra chromosome. Normally humans have two copies of every chromosome (except for males who have a pair of different chromosomes in the form of the sex chromosomes the X and the Y). In Trisomy, a child is born ...
Human beings are made up of cells that contain 23 sets, or pairs of chromosomes. Half of those chromosomes come from the mother and half from the father. On occasion, something happens within the cells to cause an abnormality in the number of chromosomes present; sometimes, there are too few chromosomes and other times, there ...
Triple-X Females A female usually has only 2 X-chromosomes in each cell. In approximately 1 per 1,000 female births, a child is born with 3 X-chromosomes in each cell. Most often this condition isn’t diagnosed until later in life. People normally have 46 chromosomes in each cell. Two of the 46 chromosomes are sex chromosomes, ...
I am a mother of four lovely girls. My younger sister (who came next to me) has two burly boys. The rest of our siblings have at least one boy and one girl in their respective broods. During family gatherings, my sister and I never get tired of kidding our respective youngest kids by saying ...
Hybrids are often created by putting two similar related species in the same pen and letting “nature” take is course. However, when the size difference of the two species makes breeding physically impossible this isn’t an option. This is the case with the camel and the llama. How did we get a cama then? A ...
Many pet enthusiasts know that calico and tortoiseshell cats are typically female. Some even brag that they’ve paid for a male, and that their cat is rare. Why does this particular color pattern happen mostly in female cats? What is Calico, or Tortoiseshell? Both calico and tortoiseshell refer to cats that have three colors of ...
Mitosis is the process of cell division that results in two cells identical to the original parent cell. Mitosis is made up of multiple stages that are characterized by the position of the chromosomes inside the cells. Interphase is the stage the cell is in when it is not undergoing mitosis. The cell undergoes normal ...
