Nmdcat Practice Paper from PMDC Syllabus | mosaicbro.com

Nmdcat Practice Paper from PMDC Syllabus

7 of 197 questions (Page 10 of 29)

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64 What is the phenotypic ratio in a test cross between a heterozygous tall plant and a dwarf plant?
Correct Answer: A
Explanation: Test cross (Tt × tt) yields 1 tall (Tt) : 1 dwarf (tt).
65 The physical expression of a trait is known as:
Correct Answer: C
Explanation: Phenotype is the observable trait (e.g., tall), while genotype is the genetic makeup (e.g., Tt).
66 Which of the following supports Mendel’s Law of Independent Assortment?
Correct Answer: C
Explanation: Dihybrid crosses (e.g., YyRr × YyRr) show independent assortment of traits (9:3:3:1 ratio).
67 In Mendel’s experiments, the recessive trait reappeared in the F2 generation because:
Correct Answer: C
Explanation: Recessive traits reappear when heterozygous F1 parents (Tt) produce homozygous recessive (tt) offspring.
68 A gene with two identical alleles is called:
Correct Answer: B
Explanation: Homozygous genotypes have identical alleles (e.g., TT or tt).
69 A '-CHO' group can be present:
Correct Answer: B
Explanation: Aldehydes (-CHO) are terminal groups (e.g., formaldehyde HCHO, acetaldehyde CH₃CHO).
70 Acetaldehyde in laboratory is produced by:
Correct Answer: B
Explanation: Acetaldehyde (CH₃CHO) is made by oxidizing ethanol (CH₃CH₂OH) with K₂Cr₂O₇/H₂SO₄.
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