Nmdcat Practice Paper from PMDC Syllabus | mosaicbro.com

Nmdcat Practice Paper from PMDC Syllabus

7 of 197 questions (Page 9 of 29)

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57 In a monohybrid cross between two heterozygous parents (Tt × Tt), what is the genotypic ratio in the F2 generation?
Correct Answer: A
Explanation: Genotypic ratio: 1 TT : 2 Tt : 1 tt (25% homozygous dominant, 50% heterozygous, 25% recessive).
58 Mendel chose pea plants for his experiments because:
Correct Answer: C
Explanation: Peas are fast-growing, produce many offspring, and have clear-cut traits (e.g., tall/short).
59 Which of the following best describes Mendel’s Law of Dominance?
Correct Answer: A
Explanation: Dominant alleles (e.g., T for tall) mask recessive alleles (t for dwarf) in heterozygotes.
60 In Mendel’s experiments, a homozygous tall plant is crossed with a homozygous dwarf plant. What is the height of the F1 generation?
Correct Answer: C
Explanation: F1 offspring are all tall (Tt) because tall (T) is dominant over dwarf (t).
61 What was the key conclusion from Mendel’s dihybrid crosses?
Correct Answer: C
Explanation: Dihybrid crosses demonstrated independent assortment of genes on different chromosomes.
62 A test cross is used to determine:
Correct Answer: C
Explanation: A test cross (cross with homozygous recessive) reveals if a dominant phenotype is homozygous or heterozygous.
63 Which generation did Mendel cross to get the 3:1 phenotypic ratio?
Correct Answer: C
Explanation: The F2 generation (from selfing F1 hybrids) shows a 3:1 dominant-to-recessive ratio.
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