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Mistakes in meiosis may cause Down syndrome. The error happens when the chromosomes segregate into the gametes. The egg or sperm may have too many or too few chromosomes. Down syndrome has an extra chromosome in the 21st pair.
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∙ 9y ago
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∙ 9y agoSomething to do with science
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What is the medical term meaning abnormal condition of meiosis?
Nondisjunction is the medical term meaning abnormal condition of meiosis. For example, trisomy 21 (Down syndrome) is a nondisjunction.
Is down syndrome a single gene disorder?
People with Down syndrome have an extra copy of chromosome 21 in every cell. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis, when sex cells form. Hope this helps!!
Is thalassemia sex-linked trait?
Down syndrome results from a nondisjunction during cell division. That is, homologous chromosomes 21 fail to separate in meiosis I, or sister chromatids 21 during meiosis II or mitosis. Down syndrome is caused by trisomy of chromosome 21 (an extra chromosome to the usual two), which is an autosomal chromosome. Therefore it is not a sex linked disorder.
What are the physical and the mental and the behavioral abnormalities in someone who has Down syndrome?
There are no mental or behavioral abnormalities, but people who have Down's Syndrome have rounded shoulders, a thicker skull, and a spongy tongue which causes speech impediment.
Why do geneticists suspect that the extra chromosome seen in down syndrome usually comes from the egg rather than the sperm?
Meiosis takes longer in the ovary, increasing the likelihood of error.
If a child is born with down syndrome when did the mutation occur?
During meiosis
Down Syndrome most often occurs when-?
Down Syndrome often occurs when chromosomes fail to separate properly during meiosis.
What trisomy causes Down syndrome?
Down syndrome is caused by the presence of a third chromosome 21
What pathogen causes Down syndrome?
bacteria
What is a genetic condition that can result when chromosomes don't separate correctly during meiosis?
Trisomy 21 (Down's syndrome), Turner's syndrome (XO), and Klinefelter's syndrome (XXY) are a few examples of genetic disorders that can result when chromosomes don't separate correctly during meiosis.
Where can you find information about someone who has both Down syndrome as well as Klinefelter's syndrome?
Causes of Klinefelter SyndromeThe additional sex chromosomes in men with Klinefelter syndrome results from nondisjunction during meiosis and may have a paternal (50 to 60 percent) or maternal (40 to 50 percent) origin. This contrasts with Down syndrome, which is caused predominantly by maternal nondisjunction and inheritance of the extra chromosome 21 from the mother.
Does Down Syndrome causes childlike behavior?
yes it causes childlike symptoms
What is the medical term meaning abnormal condition of meiosis?
Nondisjunction is the medical term meaning abnormal condition of meiosis. For example, trisomy 21 (Down syndrome) is a nondisjunction.
How are cells of a person with Down syndrome different from those of a person without the disorder?
In Down syndrome, a person's cells have an extra copy of chromosome 21. In other words, instead of a pair of chromosomes, a person with Down syndrome has three of that chromosome. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis. People with Down syndrome have a degree of mental retardation. Heart defects are also common, but can be treated.
Is down syndrome a single gene disorder?
People with Down syndrome have an extra copy of chromosome 21 in every cell. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis, when sex cells form. Hope this helps!!
How are the cells of a person with Down syndrome different from those of a person without Down syndrome?
In Down syndrome, a person's cells have an extra copy of chromosome 21. In other words, instead of a pair of chromosomes, a person with down syndrome has three of that chromosome. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis. People with down syndrome have a degree of mental retardation. Heart defects are also common, but can be treated.
What genes are responsible for Down Syndrome?
Since Down syndrome isn't a sex-linked trait, it won't be passed down from parent to child, and it has nothing to do with the genetics of the previous generations. Getting Down syndrome happens by a "mess up" in reproduction, not from getting it from previous generations.
