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how could a zygote end up with an extra chromosome
Either the egg or the sperm doesn't divide equally.
Ebba Hoeger
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∙ 13y agothe egg or the sperm doesn't divide equally!
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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 ) .
What are the end of the chromosome called?
telomere
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.
Why x chromosome is placed in group c and y chromosome placed at the end of forth row?
the y chromosome doesn't carry any genetic information
Could a human end up with special ability if they had more chromosomes than normal?
Contrary to comic book mythology, if you mess with the number of chromosomes, the result is either a nonviable zygote, severe genetic abnormalities, or later in life, cancer. Humans can survive with extra or missing sex chromosomes, but usually an odd number of autosomes results in spontaneous abortion of the embryo. In short, you will not be able to read minds with a few extra chromosomes.
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.
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.
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 ) .
What is the size of a period at the end of a sentence?
The size of a period at the end of a sentence is typically around 1/8 of an inch in height.
What are the end of the chromosome called?
telomere
What are 2 possible end results of meiosis?
There could be 4 daughter cells with half the chromosomes as the original. Another outcome is crossing over in which one allele from one chromosome changes positions with an allele from another chromosome.
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).
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.
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.
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
What happens during the zygote period?
the zygote travels down the fallopian tube and attaches itself to the thick end lining of the uterus.
