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en.wikipedia.org/wiki/Extra_chromosome

Aneuploidy is the presence of an abnormal number of chromosomes in a cell, for example a human cell having 45 or 47 chromosomes instead of the usual 46. It does not include a difference of one or more complete sets of chromosomes.A cell with any number of complete chromosome sets is called a euploid cell. An extra or missing chromosome is a common cause of genetic disorders, including some ...

en.wikipedia.org/wiki/XYY_syndrome

XYY syndrome is a genetic condition in which a male has an extra Y chromosome. Symptoms are usually few. They may include being taller than average, acne, and an increased risk of learning problems. The person is generally otherwise normal, including normal fertility.. The condition is generally not inherited from a person's parents but rather occurs as a result of a random event during sperm ...

www.babycenter.com/404_what-does-it-mean-when-a-baby-has...

What does it mean when a baby has an extra chromosome? Russell Turk. obstetrician. Normally, a baby inherits 23 chromosomes from each parent, for a total of 46. Each chromosome matches the corresponding chromosome from the other parent, forming 23 numbered pairs. ... Learn how to prevent human immunodeficiency virus (HIV) in a newborn and how ...

www.genome.gov/11508982/chromosome-abnormalities-fact-sheet

How many chromosomes do humans have? The typical number of chromosomes in a human cell is 46: 23 pairs, holding an estimated total of 20,000 to 25,000 genes. One set of 23 chromosomes is inherited from the biological mother (from the egg), and the other set is inherited from the biological father (from the sperm).

learn.genetics.utah.edu/content/disorders/extraormissing

But if chromosomes separate unevenly, the resulting egg or sperm cell can end up with an extra or a missing chromosome. If this egg or sperm participates in fertilization, then the resulting embryo will have too many or too few chromosomes. As the embryo grows and the cells divide, the chromosomes are copied in every cell of the body.

www.quora.com/What-does-it-mean-if-someone-has-a-24th...

A situation where there is an extra chromosome is called trisomy, if there is less chromosome, it is called monosomy. An extra chromosome is the 47th chromosome in the human cells. This means that an individual with extra chromosome will have 22 pairs plus three chromosomes (one from the mother and two from the father or vice versa).

sciencing.com/happens-child-born-extra-chromosome-23rd...

The human genome is made up of a total of 23 chromosomes: 22 autosomes, which occur in matched pairs, and 1 set of sex chromosomes. Sex chromosomes determine your gender and can be matching or not. Women get two copies of the X-chromosome, but men get one copy of the X-chromosome and one copy of the Y-chromosome.

www.pbs.org/wgbh/evolution/library/07/3/l_073_47.html

First, the banding (or dye pattern) of human chromosome 2 closely matches that of two separate chromosomes found in apes (chimp chromosome 2 and an extra chromosome that does not match any other ...

www.wisegeek.com/what-are-the-different-types-of...

If the cell has too many chromosomes, this is called polyploidy. Often, the cell only has one extra copy of a certain chromosome. In humans, it has three copies instead of two, so it is called a trisomic cell. If the cell has one copy of a chromosome, it is called a monosomic cell. Nondisjunctions in human cells are relatively common.

www.genome.gov/26524120/chromosomes-fact-sheet

Humans have 23 pairs of chromosomes, for a total of 46 chromosomes. In fact, each species of plants and animals has a set number of chromosomes. A fruit fly, for example, has four pairs of chromosomes, while a rice plant has 12 and a dog, 39.