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What occurs during nondisjunction?
If nondisjunction occurs, abnormal numbers of chromosomes may find their way into gametes, and a disorder of chromosome numbers may result.
What is the cause of holoprosencephaly?
Holoprosencephaly has no single cause, but about half of all cases are associated with abnormal karyotype (abnormal numbers of chromosomes), especially trisomy 13 (extra copy of chromosome 13) and trisomy 15 (extra copy of chromosome 15).
In one kind of abnormal chromosome inheritance called?
In one kind of abnormal chromosome inheritance called Down syndrome, a child has three copies of Chromosome 21!
What is xp21 gene?
Dystrophin gene / Xp21 gene / DMD gene: Found at locus Xp21 of the X chromosome, this is why it's called the (Xp21 gene) It's the gene responsible for Duchenne muscular dystrophy(DMD) when mutated, this is why it's called (DMD gene)
How can two unaffected people have a child who has Duchenne muscular dystrophy?
This is exactly how DMD is transmitted: the defect resides on the X chromosome. Women have 2 X chromosomes, so even if one of the X chromosomes has the DMD trait, the other X chromsome does not and they never get DMD. This is why boys exclusively get Duchenne - they have only one X chromosome. So if a woman carries the Duchenne trait, there is a 50% chance that she will pass DMD to her male offspring. Similarly, there's a 50% chance that her daughters will become carriers like her.
How abnormal number of any chromosome gets into gamete?
That happens in Ana phase.When a chromosome is not split in centromere,a chromosome fully moves to a daughter cell.
In one kind of abnormal chromosome inheritance called down syndrome a child has three copies of what?
chromosome 21
What chromosome is abnormal in a human karyotype?
when the chromosomes is 47 or less than 46
What condition is caused by a chromosome going the wrong way during genetic formation producing a zygote with an extra chromosome?
An abnormal number of chromosomes is called aneuploidy. If a chromosome has 3 of its kind, it is trisomic. The exact condition depends on which gene has the extra chromosome.
What does abbreviation dmd Ps mean?
dmd Ps
What gene is affected by Barth syndrome?
Barth syndrome occurs when a person is born with a mutated, or abnormal, TAZ1 (or G4.5) gene. This abnormal gene is located on the X chromosome, which is a sex-determining chromosome. Males have one X and one Y chromosome, while females have two X chromosomes.
Can Karyotypes help pinpoint cases caused by unusual chromosome numbers?
A karyotype can be valuable in pinpointing cases of unusual chromosome numbers in a cell.
