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sciencing.com/happens-child-born-extra-chromosome-23rd-pair-15692.html

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.

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.

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.

ghr.nlm.nih.gov/primer/mutationsanddisorders/chromosomalconditions

Cells with two additional sets of chromosomes, for a total of 92 chromosomes, are called tetraploid. A condition in which every cell in the body has an extra set of chromosomes is not compatible with life. In some cases, a change in the number of chromosomes occurs only in certain cells.

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

There are 23 pairs(46) of chromosomes in normal humans i.e. 22 chromosomes called the autosomes and X(female) or Y(male) chromosomes, that makes it 23 called the sex chromosomes. A situation where there is an extra chromosome is called trisomy, if...

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

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.babycenter.com/404_what-does-it-mean-when-a-baby-has-an-extra-chromosome...

What does it mean when a baby has an extra chromosome? By Russell Turk, M.D., 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.

www.genome.gov/about-genomics/fact-sheets/Chromosome-Abnormalities-Fact-Sheet

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).

www.youtube.com/watch?v=6BsXLnLn9ok

The myth of the "supermale" and the extra Y chromosome Vox. Loading... Unsubscribe from Vox? Cancel Unsubscribe. Working... Subscribe Subscribed Unsubscribe 6.89M. Loading...