Table of Contents
What genetic disorder has an extra X chromosome?
Klinefelter syndrome is caused by an additional X chromosome. This chromosome carries extra copies of genes, which interfere with the development of the testicles and mean they produce less testosterone (male sex hormone) than usual.
What happens when there is an extra X chromosome?
Klinefelter syndrome is a common genetic condition where a male is born with an extra X chromosome. Typically, a male has one X and one Y chromosome. People with Klinefelter syndrome can experience breast growth, breast cancer, osteoporosis, infertility and learning difficulties.
Which syndrome is caused by the presence of an extra X chromosome in females?
Triple X syndrome is a genetic disorder caused by the presence of an extra X chromosome in females. However, it is not usually inherited from an affected parent. Most cases are caused by errors in chromosome replication and division during the formation of egg or sperm cells, and occur completely by chance.
What genetic disorder only affects males?
XYY syndrome is a rare chromosomal disorder present at birth that affects only males. It is estimated to occur in approximately one in 1,000 live births.
What is Slos syndrome?
Smith-Lemli-Opitz syndrome (SLOS) is a genetic condition that affects many parts of the body. It is an autosomal recessive genetic condition caused by changes in the DHCR7 gene. Problems associated with SLOS are usually noticeable before or shortly after birth (congenital).
What causes an extra chromosome in Triple X syndrome?
Mosaic. Occasionally, the extra chromosome results from an incorrect cell division caused by a random event early in the embryo’s development. If this is the case, the child has a mosaic form of triple X syndrome, and only some cells have the extra X chromosome. Females with the mosaic form may have less obvious symptoms.
What are the types of chromosomal abnormalities?
Chromosome abnormalities can be numerical or structural. A numerical abnormality mean an individual is either missing one of the chromosomes from a pair or has more than two chromosomes instead of a pair.
What is trisomy X?
Also called trisomy X, this condition is caused by the presence of an extra copy of the X chromosome in females, meaning each of her cells has 47 chromosomes.
What is X-chromosome deficiency?
This condition affects females and arises from a missing or abnormally structured X chromosome. Women with the condition are of short stature and infertile. In the majority of cases, women only have one copy of the gene (referred to as monosomy) but in some cases the second X chromosome is present but is abnormally arranged or partially missing.