The presence of two or more cell lines from different zygotes in a single individual is known as:

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Pediatric Genetic Questions

Question 1 of 5

The presence of two or more cell lines from different zygotes in a single individual is known as:

Correct Answer: D

Rationale: Chimaerism is two or more cell lines from different zygotes (e.g., fused embryos); mosaicism is from one zygote.

Question 2 of 5

Repeat core sequences consisting of 2,3, or 4 base pairs are known as what?

Correct Answer: B

Rationale: Microsatellites are short tandem repeats of 2-4 base pairs.

Question 3 of 5

Which of the following diagnostic techniques is of no value for the diagnosis of neural tube defects?

Correct Answer: B

Rationale: CVS tests chromosomes, not neural tube defects (NTDs); others detect NTDs via AFP or imaging.

Question 4 of 5

The following diseases constitute the Chromosome Instability Syndromes - Ataxia telangiectasia - Fanconi anemia - Bloom syndrome - Xeroderma Pigmentosum: The following statements on the syndromes are correct EXCEPT:

Correct Answer: A

Rationale: A is incorrect; radiation is avoided due to DNA repair defects increasing sensitivity.

Question 5 of 5

Imagine if the humans' diploid chromosomal complement is 10 instead of 46. What would the number of possible combinations of meiosis be:

Correct Answer: B

Rationale: The number of possible chromosome combinations in meiosis is 2^n, where n is the haploid number. If diploid is 10 (2n=10), then haploid is 5 (n=5). Thus, 2^5 = 32 combinations. Answer 'B' (32) is correct. Rationale: Each chromosome segregates independently (Mendel’s Law of Independent Assortment), so with 5 chromosome pairs, there are 2 choices (maternal or paternal) per pair, yielding 32 unique gametes.

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