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how could a zygote end up with an extra chromosome
Either the egg or the sperm doesn't divide equally.
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What effect does Down syndrome have on the chromosomes?
Down syndrome is usually caused by a condition known as Trisomy 21, which means that a person has three copies of Chromosome 21, rather than the usual two copies. An extra chromosome is added. The normal amount is 46, but people with Down syndrome have 47.Occasionally, the condition is a result of part of Chromosome 21 becoming fused to the end of another chromosome.More info on Chromosome 21While Chromosome 21 isn't the shortest chromosome, it is the one that contains the fewest genes (other than the Y chromosome). This is because genes on Chromosome 22 are more closely spaced, and thus the chromosome contains more genes, despite its smaller size.
Referring to chromosomes what is the zygote?
The usual number of chromosomes in a baby's cell ( zygote ) is 46 . 23 chromosomes from both the male's reproductive cell ( sperm ) and the female's reproductive cell ( egg ) .
Why x chromosome is placed in group c and y chromosome placed at the end of forth row?
The X chromosome is generally larger and carries more genetic information compared to the Y chromosome. In the traditional system of organizing chromosomes by size, the X chromosome is placed in group C as it is larger, while the Y chromosome is smaller and simpler, so it is usually placed at the end of the fourth row.
A chromosome with sub-terminal centromere is?
A chromosome with a sub-terminal centromere has its centromere located towards one end of the chromosome rather than in the middle. This can affect the behavior of the chromosome during cell division and can impact genetic inheritance and variability.
What forms around the two chromosome groups at the end?
Cytoplasm
How can a zygote end up with an extra chromosome?
how could a zygote end up with an extra chromosome Either the egg or the sperm doesn't divide equally.
Describe a normal karyotype and a abnormal karyotype?
A normal karyotype will show all 23 chromosomes at normal growth, and the end will show an either XY (boy) or XX (girl). Karyotypes of people with autosomal diseases and other diseases associated with chromosomes will show abnormalities on that certain chromosome. For example, Down syndrome is caused by a whole extra chromosome on chromosome 21. This extra chromosome can be seen on the karyotype.
What effect does Down syndrome have on the chromosomes?
Down syndrome is usually caused by a condition known as Trisomy 21, which means that a person has three copies of Chromosome 21, rather than the usual two copies. An extra chromosome is added. The normal amount is 46, but people with Down syndrome have 47.Occasionally, the condition is a result of part of Chromosome 21 becoming fused to the end of another chromosome.More info on Chromosome 21While Chromosome 21 isn't the shortest chromosome, it is the one that contains the fewest genes (other than the Y chromosome). This is because genes on Chromosome 22 are more closely spaced, and thus the chromosome contains more genes, despite its smaller size.
Are all of cow chromosomes telocentric?
I thought they were acrocentric (centromere positioned so close to the end of the chromosome that the short arm of the chromosome is not visible) rather than telocentric (centromere located completely at the terminal end of the chromosome).
Referring to chromosomes what is the zygote?
The usual number of chromosomes in a baby's cell ( zygote ) is 46 . 23 chromosomes from both the male's reproductive cell ( sperm ) and the female's reproductive cell ( egg ) .
How do you get nondisjunction?
You are born with it>>>>>>>>>>>During meiosis, chromosomes are separated equally. When they are notseparated equally - this is known as non-disjunction - the gametes end up with either an extra chromatid or no chromatid. In Down syndrome the offspring carries an extra chromatid in Chromosome 21, aka Trisomy 21
Is trisomy 13 inherited by a dominant or recessive trait or is it sex linked?
Trisomy 18 is a form of chromosomal aberration. It is neither recessive nor dominant. Neither does it show co-dominance or incomplete dominance factor. It arises due to the presence of an extra chromosome 18 in the somatic cells.
Why x chromosome is placed in group c and y chromosome placed at the end of forth row?
The X chromosome is generally larger and carries more genetic information compared to the Y chromosome. In the traditional system of organizing chromosomes by size, the X chromosome is placed in group C as it is larger, while the Y chromosome is smaller and simpler, so it is usually placed at the end of the fourth row.
A chromosome with sub-terminal centromere is?
A chromosome with a sub-terminal centromere has its centromere located towards one end of the chromosome rather than in the middle. This can affect the behavior of the chromosome during cell division and can impact genetic inheritance and variability.
What forms around the two chromosome groups at the end?
Cytoplasm
How does non disjunction relate to the Down syndrome?
During meiosis, chromosomes are separated equally. When they are not separated equally - this is known as non-disjunction - the gametes end up with either an extra chromatid or no chromatid. In Down syndrome the offspring carries an extra chromatid in Chromosome 21, aka Trisomy 21.
What happens to the chromosomes number by the end of meiosis?
The chromosome number at the end of meiosis is half of the parent cell
