Cytogenetics Flashcards
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Trisomy 18
Overview
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/076/a_image_thumb.png?1473902268)
Both meiosis and mitosis convert 4n content of DNA to 2n content how are these events different?
In mitosis the sister chromatids are identical when the 2 n state is reached
In meiosis the sister chromatids are identical when the 2n state is reached
The events are not different
(But the 2n content in mitosis are from both parents e.g. not identical)
Mitosis
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/170/a_image_thumb.png?1473902347)
Meiosis
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/191/a_image_thumb.png?1473902375)
Independent Assortment of Chromosomes
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/201/a_image_thumb.png?1473902402)
Crossing over in Meiosis
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/219/a_image_thumb.png?1473902453)
How many distinct human chromosomes are there?
23
24
46
47
48
24
Identify the Karyotype and the logic behind the numbering
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/222/a_image_thumb.png?1473902517)
Terminology
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/266/a_image_thumb.png?1473902534)
Banding patterns of Chromosomes
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/309/a_image_thumb.png?1473902574)
Other banding techniques
![](https://s3.amazonaws.com/brainscape-prod/system/cm/196/704/363/a_image_thumb.png?1473902601)
Autosomal Numbers
1-22
X, Y
Sex Chromosomes
p
short arm of chromosome, petit
q
Long arm of the chromosome
del
Deletion of chromosome material
der
Derivative, a structurally rearranged chromosome
Dup
Duplication of part of a chromosome
Ins
Insertion of DNA into a Chromosome
Inv
Inversion of DNA within a Chromosome
/
a designation to indicate mosaicism, two different types of cells within one individual
t
Translocation; the regions which are translocated are described after the t symbol
Ter
terminal or (pter, qter)
r
Ring Chromosome
+ or -
Placed before the chromosome number, additions or deletions of a whole chromosome