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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?
The size of the chromosome pair determines its number. The largest chromosome pair is given the number 1, followed by the second-largest pair with the number 2, and so on.
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.
How many chromosomes does a person with edward Syndrome have?
A person with Edwards syndrome (Trisomy 18) has an extra copy of chromosome 18, resulting in a total of 47 chromosomes instead of the typical 46. This additional chromosome can lead to developmental abnormalities and health complications.
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.
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 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
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.
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?
The size of the chromosome pair determines its number. The largest chromosome pair is given the number 1, followed by the second-largest pair with the number 2, and so on.
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.
If a human gamete with an extra chromosome participated in fertilization with a normal human gamete what condition results?
A trisomy. Trisomies are usually fatal in all chromosome pairs except 5, 13, 21 (these cause Down syndrome), and 23 (The chromosome pair that determines gender)
