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Principles of Inheritance and Variation Biology - Principles of Inheritance and Variation

Uttarakhand Board (UBSE) - STD 12 Science - Biology (Uttarakhand - English Medium). 1,012 questions in this chapter.

Question types

Principles of Inheritance and Variation question types

1,012 questions across 6 question groups — pick any mix to generate a Biology paper with step-by-step answer keys.

1,012
Questions
6
Question groups
5
Question types
Sample Questions

Principles of Inheritance and Variation questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2M.C.Q (1 Marks)1 Mark
A cross in which an organism showing a dominant phenotype $($genotype unknown$)$ is crossed with the recessive parent in order to know its genotype is called as:
  • A
    Monohybrid cross
  • B
    Back cross
  • ✓
    Test cross
  • D
    Dihybrid cross

Answer: C.

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Q 173 Marks Question3 Marks
Using a Punnett Square, workout 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.
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Q 183 Marks Question3 Marks
When a cross in made between tall plant with yellow seeds (TtYy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be,
  1. Tall and green.
  2. Dwarf and green.
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Q 235 Marks Questions5 Marks
A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.
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Q 26Assertion (A) & Reason (B) MCQ1 Mark
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : $Y$ chromosome causes maleness.
Reason: If the number of $X$ chromosome is more than one, femaleness dominates.
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • ✓
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.

Answer: C.

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Q 27Assertion (A) & Reason (B) MCQ1 Mark
Directions: In the following questions, the Assertions $(A)$ and Reason$(s) (R)$ have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion: $\text{XX - XY}$ type of sex determination mechanism is an example of female heterogamety and is found in Drosophila.
Reason: Male heterogamety is seen in moths where males produce two different types of gamete.
  • A
    Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  • B
    Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  • C
    Assertion is correct but Reason is incorrect.
  • ✓
    Both Assertion and Reason are incorrect.

Answer: D.

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Q 28Assertion (A) & Reason (B) MCQ1 Mark
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Mendel was successful in his hybridisation experiments.
Reason: Garden pea proved to be an ideal experimental material.
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • ✓
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.

Answer: B.

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Q 29Assertion (A) & Reason (B) MCQ1 Mark
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Quantitative inheritance is called polygenic inheritance.
Reason: Several genes control the expression of a trait.
  • ✓
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.

Answer: A.

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Q 30Assertion (A) & Reason (B) MCQ1 Mark
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: In some Drosophila, bilateral gynandromorphs are found.
Reason: The gynandromorphs are formed by an irregularity in mitosis at the first cleavage of the zygote.
  • ✓
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.

Answer: A.

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