Download PDF – Principles of Inheritance and Variations (Class 12th – Biology) Revision Test | MCQs For NEET

Principles of Inheritance and Variations (Class 12th – Biology) Revision Test | MCQs For NEET

Q1. A recessive allele is expressed in

A) heterozygous condition only

B) homozygous condition only

C) F3 generation

D) both homozygous and heterozygous conditions.

Answer: (B)

It is expressed in homozygous condition only.

Q2. The characters which appear in the first filial generation are called

A) recessive characters

B) dominant characters

C) holandric characters

D) lethal characters

Answer: (B)

These characters are called dominant characters

Q3. What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus ?

A) 3:01

B) 1:02:01

C) 1:01

D) None of the above

Answer: (C)

Q4. In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be

A) 25%

B) 50%

C) 75%

D) 100%

Answer: (B)

Q5. What is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?

A) Zero

B) 50%

C) 25%

D) 100%

Answer: (C)

The probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants is 25%

Q6. Which of the following crosses will give tall and dwarf pea plants in same proportions ?

A) TT × tt

B) Tt × tt

C) TT × Tt

D) tt × tt

Answer: (B)

Tt × tt will give tall and dwarf pea plants in same proportions

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