Podcast
Questions and Answers
What is the karyotype of an individual with Down syndrome?
What is the karyotype of an individual with Down syndrome?
- 46, XX
- 47, XX+ 21 (correct)
- 46, XY+ 21
- 47, XY
Who was the British physician credited with describing Down syndrome in 1866?
Who was the British physician credited with describing Down syndrome in 1866?
- Thomas Hodgkin
- Edward Seguin
- Henry Maudsley
- John Langdon Down (correct)
What is the cause of Down syndrome?
What is the cause of Down syndrome?
- Nondisjunction during meiosis (correct)
- Translocation of chromosome 21
- Deletion of chromosome 21
- Nondisjunction during mitosis
Which term describes the condition where there is only a single copy of a chromosome present?
Which term describes the condition where there is only a single copy of a chromosome present?
What is the term for the incorrect separation of chromosomes or sister chromatids during meiosis?
What is the term for the incorrect separation of chromosomes or sister chromatids during meiosis?
In genetics, what is the term for the condition where there are three copies of a chromosome?
In genetics, what is the term for the condition where there are three copies of a chromosome?
What term refers to the condition where there are 4 copies of chromosomes present?
What term refers to the condition where there are 4 copies of chromosomes present?
Which term describes the normal condition of having complete two sets of chromosomes?
Which term describes the normal condition of having complete two sets of chromosomes?
What is the term for the incorrect separation of chromosomes or sister chromatids during meiosis?
What is the term for the incorrect separation of chromosomes or sister chromatids during meiosis?
Study Notes
Down Syndrome
- The karyotype of an individual with Down syndrome is 47, XY/+21 or 47, XX/+21.
- British physician John Langdon Down is credited with describing Down syndrome in 1866.
Chromosomal Conditions
- The cause of Down syndrome is having an extra copy of chromosome 21, resulting in three copies (trisomy).
- Nullisomy is the condition where there is only a single copy of a chromosome present.
- Non-disjunction is the term for the incorrect separation of chromosomes or sister chromatids during meiosis.
- Trisomy is the condition where there are three copies of a chromosome.
- Tetrasomy is the term for the condition where there are 4 copies of chromosomes present.
- Diploidy is the normal condition of having complete two sets of chromosomes.
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Description
Test your knowledge about Down syndrome, a genetic disorder caused by the presence of an extra chromosome 21. Learn about its characteristics and diagnosis, as well as the history and genetic basis of this condition.
