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ICSE Question Bank

Genetics – Some Basic Fundamentals

Appeared in 10 of the 11 available papers.

Examined in
10 of 11 papers

Appears almost every year — treat as core

Typically worth
6.2 marks

Average per paper it appears in · 62 marks in total

Usual form
Short answer

27% of this chapter's 62 questions

Needs a diagram
8%

5 questions carry a figure — practise drawing them

Question-type distribution

  • Short answer17
  • MCQ14
  • Definition13
  • Reasoning10
  • Biological term5
  • Odd one out2
  • Analogy1

Most frequent topics

Mutation 4Law of Dominance 3Dihybrid cross — F1 generation 3Gametes of a dihybrid 3Dihybrid F2 phenotypic ratio 3Genetic disorders vs infectious diseases 2Allele 2Recessive allele 2
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Showing 25 of 62 matching questions (62 marks).

25 questions

1(b)

Explain the following terms:

5(b)

Give appropriate biological / technical terms for the following:

7(a)

A homozygous dominant tall pea plant bearing red flowers (TTRR) is crossed with a homozygous recessive dwarf pea plant bearing white flowers (ttrr).

7(b)

The diagram given below is that of a developing human foetus. Answer the questions that follow:

Figure for this question
1(e)

Choose the correct answer from the four options given below:

1(f)

Identify the ODD term in each set and name the CATEGORY to which the remaining three belong. Example: glucose, starch, cellulose, calcium — Odd term: calcium; Category: the others are different types of carbohydrates.

6(a)

In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).

4(b)

Give appropriate biological or technical terms for the following:

7(b)

A pea plant which is homozygous for green pods which are inflated [GGII] is crossed with a homozygous plant for yellow pods which are constricted [ggii]. Answer the following questions:

1(f)

Given below are groups of terms. In each group the first pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis. Example: Oxygen : Inspiration :: Carbon dioxide : Expiration

6(b)

Give appropriate biological / technical terms for the following:

7(a)

In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).