The image you've provided appears to be a karyotype, which is a visual representation of an individual's chromosomes arranged in pairs according to size, shape, and number. The goal is to analyze the karyotype to determine the
sex of the patient and make a
diagnosis based on any chromosomal abnormalities.
Let’s break this down step by step:
---
🔍 Step 1: Understand the Karyotype Layout
- A normal human karyotype has
46 chromosomes, or
23 pairs.
- Chromosomes are numbered from 1 to 22 (autosomes), and then the sex chromosomes (X and Y).
- The chromosomes are paired and ordered from largest (chromosome 1) to smallest (chromosome 22), followed by the sex chromosomes.
---
🔍 Step 2: Examine the Sex Chromosomes
Look at the bottom right corner of the karyotype — that’s where the
sex chromosomes are located.
In this case:
- There is
one X chromosome and
one Y chromosome.
- This indicates the patient is
male (XY).
>
✔ Sex of Patient: Male
---
🔍 Step 3: Look for Abnormalities
Now examine each chromosome pair carefully.
#### Focus on Chromosome 21
- Normally, there are
two copies of chromosome 21.
- In this karyotype,
there are three copies of chromosome 21 instead of two.
This is known as
trisomy 21.
>
✔ Diagnosis: Trisomy 21 (Down Syndrome)
Trisomy 21 is the most common cause of Down syndrome, characterized by developmental delays, distinct facial features, and other medical conditions.
---
✔ Final Answer:
-
Sex of Patient: Male
-
Diagnosis: Trisomy 21 (Down Syndrome)
---
📌 Explanation Summary:
- The presence of
X and Y chromosomes confirms the patient is male.
- An extra copy of
chromosome 21 (three copies instead of two) is clearly visible, indicating
trisomy 21.
- This condition leads to
Down syndrome, a genetic disorder associated with intellectual disability and physical growth delays.
---
🧪 Lab Section & Name:
These fields are blank and would need to be filled in by the student or lab technician.
---
🟩 Final Fill-in:
```
Name: [Student's Name]
Lab Section: [e.g., Bio 201]
Sex of Patient: Male
Diagnosis: Trisomy 21 (Down Syndrome)
```
Let me know if you'd like help labeling the chromosomes or understanding how trisomy 21 arises!
Parent Tip: Review the logic above to help your child master the concept of karyotype lab worksheet answers.
