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how could a zygote end up with an extra chromosome
Either the egg or the sperm doesn't divide equally.
What else can I help you with?
The exceptions to the rule that every chromosome is part if a homologous pair are the?
The exceptions to the rule that every chromosome is part of a homologous pair are the gametes. Gametes are eggs and sperm, and each cell has only 23 chromosomes, which form pairs in the zygote after fertilization.
Why is the number of chromosomes halved?
The normal cellular genetic complement number 2N is reduced to 1N in both of the sexual gametes so that when they recombine we end up with the standard chromosome number [1N + 1N = 2N] in our zygote.
What would be the result of an error in anaphase that failed to separate a pair of sister chromatids?
If a pair of sister chromatids failed to separate during anaphase, both chromatids would end up in the same daughter cell instead of being distributed to separate daughter cells. This would result in one daughter cell receiving an extra copy of the chromosome and the other daughter cell missing that chromosome. This is known as nondisjunction and can lead to chromosomal abnormalities and genetic disorders.
Why does each chromosome have only one chromatid?
It is not two copies of DNA but double stranded DNA. Because our first cell (zygote) after the fertilization from male and female gametes (or cells that possess only one set of DNA or haploid) carry 1+1 DNA, it forms 2x as a result.
Purpose of a telomere?
A telomere is the structure at each end of a chromosome. It consists of an area of highly repeated DNA combined with protein. Its main function is to protect the end of the chromosome.Telomeres are instrumental in enabling the cells to divide and replicate. But as we grow older these tips wear out and shorten much like the shoelace caps. When they get too short, we get diseases and die. The three Nobel Prize winners found this as they were looking for a cure for cancer.
How could a zygote could end up with a extra chromosome?
how could a zygote end up with an extra chromosome Either the egg or the sperm doesn't divide equally.
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
Why do more males end up with sex-linked disorders?
More males than females end up with sex-linked disorders because of the y chromosome. It is shorter than the x-chromosome, and increases susceptibility to these problems.
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.
Does a nondisjunction cause 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 chromosomal abnormality causes Down syndrome?
Down syndrome happens by the splitting of the chromosomes. It is not a genetic disease. It is a chromosomaldisorder.Chromosomal changes like duplications or translocations1 occur in only one sex cell. A baby normally inherits 23 chromosomes from each parent to make a total of 46 chromosomes in 23 identifiable pairs.In Down Syndrome, an extra (duplicated) chromosome number 21 is inherited from either the father or the mother, to make a total of 47 chromosomes (23 pairs plus 1) in every cell of the DS child. (DS is also called Trisomy 21 ) DS is usually inherited from the mother, and the major risk of DS is the age of the woman at conception.1A duplication is an extra copy of a chromosome (or part of a chromosome) - a translocation is an extra bit of chromosome sticking onto another chromosome.
What is klien felter's syndrome?
Klinefelter syndrome is a genetic condition where males have an extra X chromosome (XXY instead of XY). This can lead to development of smaller testes, reduced fertility, and potential for other physical and developmental differences. Treatment may involve hormone therapy and support services.
Where will extra fluid end up if you drink too much?
In the bladder, to be peed out.
What is larger a nucleosome or chromosome?
A chromosome is made up of many genes.
The exceptions to the rule that every chromosome is part if a homologous pair are the?
The exceptions to the rule that every chromosome is part of a homologous pair are the gametes. Gametes are eggs and sperm, and each cell has only 23 chromosomes, which form pairs in the zygote after fertilization.
Why is the number of chromosomes halved?
The normal cellular genetic complement number 2N is reduced to 1N in both of the sexual gametes so that when they recombine we end up with the standard chromosome number [1N + 1N = 2N] in our zygote.
What happens when a male and female sex cell join up?
The male and female chromosome combined during reproduction in fallopian tube of female after the fusion of male and female germ cell, when this germ cell strat dividing then at the miotic prophase the chromosome undergo crossing over and the two chromosome exchange their genetic data and the resulting cell have qualities or genetic material of both the parents. This process is important and essential for continuity of life. The male and female chromosome combined during reproduction in fallopian tube of female after the fusion of male and female germ cell, when this germ cell strat dividing then at the miotic prophase the chromosome undergo crossing over and the two chromosome exchange their genetic data and the resulting cell have qualities or genetic material of both the parents. This process is important and essential for continuity of life.
