9 Questions
What is the term used to describe a chromosome where the centromere is near one end of the chromosome?
Acrocentric
Which region of the Y chromosome allows for recombination with the X chromosome?
Pseudoautosomal region
In genetic mosaics, what happens to one of the X chromosomes in females?
It is randomly inactivated in somatic cells
What is the term for an unbalanced set of chromosomes, where the relative gene dosage is upset?
Monosomic
Which genetic rearrangement involves reversing the order of genes in a chromosome segment?
Inversions
What is the term for a species that has multiple complete sets of chromosomes?
Polyploid
'Double-Y' syndrome refers to which chromosomal abnormality?
'Double-Y' syndrome (47, XYY)
Which genetic event results in 'Down Syndrome'?
Trisomy 21
'Turner Syndrome' is characterized by having how many total chromosomes?
45
Study Notes
Chromosomal Terminology
- A chromosome with a centromere near one end is called an acrocenic chromosome.
Sex Chromosomes
- The region of the Y chromosome that allows for recombination with the X chromosome is called the pseudoautosomal region.
Genetic Mosaics
- In females, one of the X chromosomes is inactivated in genetic mosaics.
Chromosomal Abnormalities
- An aneuploid is an unbalanced set of chromosomes, where the relative gene dosage is upset.
Genetic Rearrangements
- Inversion involves reversing the order of genes in a chromosome segment.
Polyploidy
- A species that has multiple complete sets of chromosomes is called a polyploid.
Chromosomal Abnormalities
- Double-Y syndrome refers to a chromosomal abnormality where an individual has two Y chromosomes (XYY).
- Down Syndrome results from a genetic event called trisomy 21, where an individual has an extra copy of chromosome 21.
- Turner Syndrome is characterized by having 45 total chromosomes, where one of the sex chromosomes is missing or partially deleted.
Learn about karyotypes, metacentric, submetacentric, acrocentric chromosomes, and how chromosome bands are classified. Explore the different parts of a chromosome and their significance.
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