Which Is An Example Of A Genetic Disorder Caused By Errors That Occur During Meiosis? In a female fetus, an extra X chromosome causes Triple X syndrome. It is associated with learning disabilities and organ abnormalities. In a male fetus, Klinefelter syndrome is the result of an extra X chromosome (XXY). Males with this condition
What Happens If You Have An Extra Chromosome? For example, an extra copy of chromosome 21 causes Down syndrome (trisomy 21). Chromosomal abnormalities can also cause miscarriage, disease, or problems in growth or development. The most common type of chromosomal abnormality is known as aneuploidy, an abnormal chromosome number due to an extra or missing
What Causes Extra Copies Of Chromosomes? The addition of an extra chromosome usually occurs spontaneously during conception. The cause of this is unknown and prevention is not possible. The most important risk factor for trisomy conditions is maternal age. Women in their late 30s and 40s have a higher chance of trisomy conditions occurring. Why
What Can Go Wrong With Non Disjunction? Nondisjunction: Failure of paired chromosomes to separate (to disjoin) during cell division, so that both chromosomes go to one daughter cell and none go to the other. Nondisjunction causes errors in chromosome number, such as trisomy 21 (Down syndrome) and monosomy X (Turner syndrome). What can result from
How Can An Error In Meiosis Lead To Down Syndrome? Down syndrome is usually caused by an error in cell division called “nondisjunction.” Nondisjunction results in an embryo with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the
Can You Have An Extra Chromosome And Be Normal? Can you have an extra chromosome and be normal? A common form of aneuploidy is trisomy, or the presence of an extra chromosome in cells. “Tri-” is Greek for “three”; people with trisomy have three copies of a particular chromosome in cells instead of the normal