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Do all cases of down syndrome have a complete extra chromosome?
No, not all cases of Down syndrome involve a complete extra chromosome. The most common form, known as trisomy 21, consists of an entire extra chromosome 21, resulting in three copies instead of the usual two. However, some cases are due to a Robertsonian translocation, where a part of chromosome 21 is attached to another chromosome, or mosaic Down syndrome, where some cells have the extra chromosome while others do not.
How many chromosomes will a zygote with trisomy have?
Meiotic nondisjunction. In meiosis I or II, chromosome pair 21 fail to separate correctly, leaving one gamete with an extra chromosome 21.
What is the chromosome pair for a boy?
A boy has one X chromosome from the mother and one Y chromosome from the father, making his chromosome pair for gender determination XY.
What characteristic is used to give a chromosome pair a number?
its usually the size of it and the information that is in the pair
What does it mean when someone has an extra chromosome?
If someone has an extra chromosome it means there was a genetic mutation that is abnormal in human development. It may result in problems with the person affecting them on a basic level, or may go fully unnoticed. A common disorder that can be caused by having an extra chromosome is Down's Syndrome.
Will a child have autism if an extra chromosome is on the 21 pair?
no, an extra copy of chromosone 21 causes down syndrome
What is trisomy syndrome?
In a trisomy syndrome, an extra chromosome is present so that the individual has three of a particular chromosome instead of the normal pair.
What condition results when a child is born with extra chromosome on the twenty -first pair?
Down syndrome
What causes the abnormality in chromosome numbers in people with down syndrome?
It is most commonly caused by increased maternal age.Add: It is the result of nondisjunction of the 21st chromosome pair, in which the pair fails to separate, so that one cell gets an extra copy of chromosome 21.
Do all cases of down syndrome have a complete extra chromosome?
No, not all cases of Down syndrome involve a complete extra chromosome. The most common form, known as trisomy 21, consists of an entire extra chromosome 21, resulting in three copies instead of the usual two. However, some cases are due to a Robertsonian translocation, where a part of chromosome 21 is attached to another chromosome, or mosaic Down syndrome, where some cells have the extra chromosome while others do not.
How many chromosomes will a zygote with trisomy have?
Meiotic nondisjunction. In meiosis I or II, chromosome pair 21 fail to separate correctly, leaving one gamete with an extra chromosome 21.
What gene is affected in Down Syndrome?
It is the result of a chromosomal abnormality, in which there is an extra chromsome on the chromosome 21 pair. This is call trisomy 21.
What is the chromosome pair for a boy?
A boy has one X chromosome from the mother and one Y chromosome from the father, making his chromosome pair for gender determination XY.
What is the difference between Edward's syndrome and Patau's syndrome?
in Patau there is an extra chromosome in chromosome 13, in Edwars it the extra chromosome is in chromosome 18
Through a microscope you see an exchange of chromosome segments between chromosome pair 7 and chromosome pair 15 This condition is an example?
translocation
What characteristic is used to give a chromosome pair a number?
its usually the size of it and the information that is in the pair
What is the term for an individual who has an extra copy of one chromosome or is missing a chromosome - Is it something-'ploid'?
Aneuploid - the individual has an extra copy of one chromosome or is missing a chromosome.
