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Down syndrome is caused by the presence of an extra copy of chromosome 21, which results from a nondisjunction event during meiosis I or meiosis II. This error in chromosome segregation leads to the formation of a gamete with an extra chromosome 21, resulting in Down syndrome when fertilized.
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What is the medical term meaning abnormal condition of meiosis?
The medical term for an abnormal condition of meiosis is meiotic non-disjunction, which refers to the failure of chromosomes to separate properly during meiosis, resulting in an abnormal number of chromosomes in the resulting gametes. This can lead to conditions such as Down syndrome.
What are some diseases non-disjunction causes?
Non-disjunction can lead to genetic disorders such as Down syndrome, Turner syndrome, and Klinefelter syndrome. These disorders result from abnormal chromosome numbers due to errors in chromosome segregation during meiosis.
What is a failure of homologous chromosomes to separate in meiosis?
A failure of homologous chromosomes to separate in meiosis is called nondisjunction. This can result in cells with an abnormal number of chromosomes, leading to genetic disorders such as Down syndrome. Nondisjunction can occur during either the first or second division of meiosis.
Is down syndrome a single gene disorder?
No, down syndrome is not a single gene disorder. It is caused by the presence of an extra copy of chromosome 21, known as trisomy 21. This results in a range of physical and intellectual disabilities.
Is thalassemia sex-linked trait?
No, thalassemia is not a sex-linked trait. It is an inherited blood disorder caused by mutations in genes that affect the production of hemoglobin. These mutations can be passed down from parents to their children, regardless of the child's sex.
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.
What is the medical term meaning abnormal condition of meiosis?
The medical term for an abnormal condition of meiosis is meiotic non-disjunction, which refers to the failure of chromosomes to separate properly during meiosis, resulting in an abnormal number of chromosomes in the resulting gametes. This can lead to conditions such as Down syndrome.
Does Down Syndrome causes childlike behavior?
yes it causes childlike symptoms
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.
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.
What are some common causes of retardation?
There are many causes of retardation. These includes Down syndrome, velocariofacial syndrome, fetal alcohol syndrome, problems during pregnancy and other genetic disorders.
