MRCOG Part 2 - Genetics Antenatal Care SBA

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Question 1 of 18

1. Question
1. Mrs, X, 30 years old just finished her anomaly scan at 20 weeks of gestations. Her ultrasound report presents severe IUGR, Choroid plexus cyst, over riding of fingers, horseshoe shaped kidney rocker bottom feet.
Her prenatal tests results are depicted in this image

What’s probable cause for features
- A. Trisomy 21
- B. Trisomy 18
- C. Trisomy 16
- D. Trisomy 13
- E. None of the above
Correct

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Question 2 of 18

2. Question
2. Which is the most common trisomy in humans which causes major anomalies in fetus?
- A. Trsiomy 16.
- B. Trisomy 18.
- C. Trisomy 13.
- D. Trisomy 21
- E. None of the above
Correct

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Question 3 of 18

3. Question
3. Regarding Numerical abnormalities of chromosomes all are true except
- A. Aneuploidy refers to the gaining or loss of a chromosome.
- B. The addition of one or more complete sets of chromosomes is called polyploidy.
- C. Monosomy refers to the loss of a chromosome
- D. Monosomy refers to addition of chromosome
- E. Turners syndrome is example of Monosomy
Correct

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Question 4 of 18

4. Question
4. Match the chromosomal complement with the phenotype.
Epicanthic folds, hypertelorism, mental deficiency, single palmar crease
- A. 45,XO
- B. 46,XY
- C. 47,XXY
- D. 46,XX t(14q21q)
- E. 46,XX, 5p–
Correct

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Question 5 of 18

5. Question
5. Large breasts, scanty axillary hair, absent uterus
- A. 45,XO
- B. 46,XY
- C. 47,XXY
- D. 46,XX t(14q21q)
- E. 46,XX, 5p–
Correct

Incorrect
Question 6 of 18

6. Question
6. A male that appears with tall stature, eunuchoidism, sometimes gynecomastia
- A. 45,XO
- B. 46,XY
- C. 47,XXY
- D. 46,XX t(14q21q)
- E. 46,XX, 5p–
Correct

Incorrect
Question 7 of 18

7. Question
7. Match the chromosomal complement with the phenotype given in image
- A. 45,XO
- B. 46,XY
- C. 47,XXY
- D. 46,XX t(14q21q)
- E. 46,XX, 5p–
Correct

Incorrect
Question 8 of 18

8. Question
8. Match the chromosomal complement with the phenotype given in image
- A. 45,XO
- B. 46,XY
- C. 47,XXY
- D. 46,XX t(14q21q)
- E. 46,XX, 5p–
Correct

Incorrect
Question 9 of 18

9. Question
9. The commonest cause for this syndrome is

Which of the following is the leading cause of Down Syndrome?
- A. Nondisjunction At meiosis
- B. Non reciprocal translocation
- C. Mitotic Nondisjunction after conception
- D. Robertsonian Translocation
- E. Ring Chromosome
Correct

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Question 10 of 18

10. Question
10. Which type of aneuploidy is shown in image?
- A. Monosomy
- B. Trisomy
- C. Triploid
- D. Tetraploid
- E. None of the above
Correct

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Question 11 of 18

11. Question
11. Regarding structure of DNA all are true except
- A. The two chains are linked by hydrogen bonds
- B. The purine base adenine is paired with the pyrimidine base thymine
- C. DNA consists of a sugar–phosphate backbone
- D. DNA contains the five-carbon sugar ribose
- E. The purine base guanine is paired with the cytosine
Correct

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Question 12 of 18

12. Question
12. Regarding Numerical abnormalities of chromosomes all are true except
- A. Aneuploidy refers to the gaining or loss of a chromosome.
- B. The addition of one or more complete sets of chromosomes is called polyploidy.
- C. Monosomy refers to the loss of a chromosome
- D. Monosomy refers to addition of chromosome
- E. Turners syndrome is example of Monosomy
Correct

Incorrect
Question 13 of 18

13. Question
13. Image shows which type of fetal abnormality?
- A. Disruption
- B. Dysplasia
- C. Deformation
- D. Malformation
- E. None of the above
Correct

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Question 14 of 18

14. Question
14. Which type of Chromosomal Numerical abnormality shown in image
- A. Monosomy
- B. Trisomy
- C. Triploid
- D. Tetraploid
- E. None of the above .
Correct

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Question 15 of 18

15. Question
15. Identify this translocation?
- A. Balanced translocation
- B. Jacobsen syndrome
- C. Robertosonian translocation
- D. Wolf-Hirshchorn syndrome
- E. None of the above
Correct

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Question 16 of 18

16. Question
16. What is the most likely chromosomal abnormality responsible for this
- A. Trisomy 13
- B. Trisomy 21
- C. Chromosome 22q11 deletions
- D. 46 XXY syndrome
- E. Trisomy 18
Correct

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Question 17 of 18

17. Question
17. The following conditions except one manifest only when the individual is homozygous for the mutant allele. Which one is the exception?
- A. Galactosaemia
- B. G6PD deficiency
- C. Thalassemia
- D. Homocystinuria
- E. Achondroplasia
Correct

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Question 18 of 18

18. Question
18. The following conditions are transmitted as autosomal dominant except for which one?
- A. Neurofibromatosis
- B. Von Hippel-Lindau syndrome
- C. Tuberous sclerosis
- D. Vitamin D resistant rickets
- E. Hereditary spherocytosis
Correct

Incorrect