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Anonymous users2024-02-08Causes and diseases of chromosomal structural variations.
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Anonymous users2024-02-07Upstairs the answer is very complete, but there is one mistake: meow syndrome is a chromosomal structural variation (deletion).
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Anonymous users2024-02-06Abnormal number of chromosomes: Chromosome segregation disorder.
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Anonymous users2024-02-05Answer] :d DNA and protein cross-linking is a function between DNA and protein, but it does not affect the structural abnormalities in the chromosome ridge. Abnormalities in spindle structure and function often cause changes in the chromosome set, but have no effect on chromosome structure; Base abnormalities in the DNA strand affect the information carried by the genes, but have no effect on the chromosome structure; DNA strand breaks and in situ reconnection also had no effect on the chromosome structure of Jingyin; Only when DNA strand breaks occur and ectopic reassignment occurs, chromosomal structural abnormalities can be caused.
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Anonymous users2024-02-04Structural variations in chromosomes, such as meow syndrome caused by deletion of chromosome 5 segments in humans. Chromosomal number variations, such as one extra chromosome 21 in humans, lead to trisomy 21.
Among them, trisomy 21 can lead to dementia, such as ** Jiezhou Zhou is a patient with trisomy 21. About human genetic diseases hope to be detected through genetic testing, prenatal examinations, etc., do not let a family tragedy.
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Anonymous users2024-02-03Chromosomal disorders are generally inherited from a family of chromosomes, such as Down syndrome, and if a child is diagnosed with Down syndrome, it can lead to a decline in the child's intelligence. It also includes single-gene family disorders, most commonly albinism, which is caused by pigment loss. There is also hemophilia,**, and there are other places or inexplicable appearances.
There are many chromosomal genetic diseases, such as renal diabetes, night blindness, glaucoma, etc., as well as congenital cataracts. The more serious ones are hemophilia, albinism, spina bifida, cleft lip and palate, etc., which are hereditary diseases, which are relatively harmful to children, and are also congenital malformations. It also includes mitochondrial family genetic diseases, dental hypertrophy, diabetes insipidus, etc.
Chromosomal diseases such as trisomy 21 and trisomy 18 and trisomy 13, as well as cat-call syndrome, chromosomal diseases caused by sex chromosome abnormalities include Turner syndrome, Kirschner syndrome, superfemale syndrome and supermale syndrome, chromosomal disorders are chromosomal abnormalities caused by various reasons.
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Anonymous users2024-02-02Judging from your chromosome, you should be a male, because your chromosome is xx, so they are all males.
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Anonymous users2024-02-01This chromosome is a stained object in the human body. The normal chromosome in the human body is 24. Hue.
Your understanding of chromosomes is biased, and it doesn't mean that every pair of chromosomes corresponds to something in your body. The 23rd pair of chromosomes is a sex chromosome, which can determine sex, but not only sex, and the genes for gender-related genetic diseases such as hemophilia are also located on the 23rd pair of chromosomes (hemophilia is specifically on the X chromosome, with X recessive inheritance). >>>More
A normal person has 46 pairs of chromosomes.
Each human cell has 46 chromosomes, and the 46 chromosomes are arranged into 23 pairs according to their size and morphology, the first pair to the twenty-second pair are called autosomes, which are common to both men and women, and the twenty-third pair is a pair of sex chromosomes. >>>More
Dear, these two concepts are particularly easy to mix.
Gene mutation refers to a change in the molecular structure of a gene, that is, a change in the order of the deoxynucleotides in the gene, resulting in a change in genetic information. The frequency of genetic mutations is low, but it can produce new genes, which is important for the evolution of organisms. Genetic mutations occur because DNA is duplicated due to internal and external factors. >>>More
Female X chromosome cells, one X from the father and one X from the mother, and the father's sex cells, X must be from the grandmother and Y must be from the grandfather, so I think "at least one chromosome in the female cell is from the grandmother", it should be right. >>>More
Yes. Because the Y chromosome records the sex genes of humans and there are no other factors, the Y chromosome is the only factor that determines sex.