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how could a zygote end up with an extra chromosome
Either the egg or the sperm doesn't divide equally.
A zygote could end up with an extra chromosome through a process called nondisjunction, where chromosomes fail to separate properly during cell division. This can result in a gamete or zygote having an extra copy of a chromosome, leading to conditions like Down syndrome (Trisomy 21) when the zygote continues to divide.
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What effect does Down syndrome have on the chromosomes?
Down syndrome is caused by an extra copy of chromosome 21, resulting in a total of 47 chromosomes in each cell instead of the usual 46. This extra genetic material leads to physical and cognitive differences in individuals with Down syndrome.
Referring to chromosomes what is the zygote?
A zygote is the initial cell formed when two gamete cells (sperm and egg) fuse during fertilization. It contains a full set of chromosomes, with half inherited from each parent. The zygote is the first step in the development of a new organism.
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 caused by an extra copy of chromosome 21, resulting in a total of 47 chromosomes in each cell instead of the usual 46. This extra genetic material leads to physical and cognitive differences in individuals with Down syndrome.
Referring to chromosomes what is the zygote?
A zygote is the initial cell formed when two gamete cells (sperm and egg) fuse during fertilization. It contains a full set of chromosomes, with half inherited from each parent. The zygote is the first step in the development of a new organism.
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).
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 13 is caused by the presence of an extra copy of chromosome 13 and is not directly inherited in a typical Mendelian pattern (dominant or recessive). It usually occurs sporadically due to errors in cell division during early development. It is not a sex-linked trait.
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
