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Virtual Karyotyping Lab
Terms in this set (17)
1. What is a karyotype?
A karyotype is an organized profile of a person's chromosomes. Two chromosomes specify sex, XX for female and XY for male and the rest are arranged in pairs number 1 to 22; largest to smallest.
2. How does a karyotype help scientists?
The arrangement of the chromosomes helps scientists quickly identify chromosomal alterations that may result in a genetic disorder.
3. How do scientists make a karyotype?
Scientists take a picture of the chromosome from one cell and then cut them out. Then they arrange them by size, banding pattern, and centromere position as guides in making a karyotype.
4.. Does this person have the normal number of chromosomes? _____________
Yes, this person has the normal number of chromosomes.
5. What can you tell about the sex of this person where the chromosomes came from?
I can tell that the sex of this person by where the chromosomes came from is the person has an X and Y chromosome, so I can tell that this person is a male.
1. How many pairs of chromosomes are in a human karyotype? ___________________________
There are 23 pairs of chromosomes that are in a human karyotype.
2. What dye is used to stain the chromosomes? ________________________________________
The dye that is used to stain the chromosomes is the Giemsa dye.
3. What causes a dark band on the chromosome? ______________________________________
The region of a chromosome that are rich in the base pairs of Adenine (A) and Thymine (T) causes a dark band on the chromosome.
4. Bands do not represent single genes. How many genes can the smallest of bands represent? ____________________________________________________________________________
There are over a million base pairs and potentially over hundreds of genes that are represented in the smallest of bands.
5. What are the 4 characteristics used to compare chromosomes?
a. comparing chromosomes for their length
b. the placement of centromeres (areas where the two chromatids are joined)
c. the location of the g-bands
d. the sizes of the g-bands
What is the common name for epithelial cells? __________________________
1. (A.1) What notation would you use to characterize Patient A's karyotype? ____________________________________________________________________
Trisomy 21, extra chromosome 21 (47, XX)
2. (A.2) What diagnosis would you give for Patient A? (Choose from the choices listed in the box) ____________________________________________________________________ Patient A history: is the nearly full-term ___________of a ______________________female. Chromosomes were obtained from fetal ___________________ cells acquired through _____________________.
fetus, forty year old
3. (B.1) What notation would you use to characterize Patient B's karyotype? ________________________________________________________________________
one or more extra sex chromosomes (47, XXY)
4. (B.2) What diagnosis would you give for Patient B? _____________________________ Patient B history: is a ___________old __________ who is trying to identify a cause for his infertility. Chromosomes were taken from the nucleated cells of the patient's ____________.
5. (C.1) What notation would you use to characterize Patient C's karyotype? _______________________________________________________________________
extra chromosome 13 (47, XY)
6. (C.2) What diagnosis would you give for Patient C? ____________________________ Patient C history: Patient C died shortly after ______________, with a multitude of abnormalities, including polydactyly and a cleft lip. Chromosomes were taken from a _________________ sample.
Trisomy 13 Syndrome
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