ICSE Class 10 Principles of Inheritance and Variation — Mock Test

Free online mock test for Principles of Inheritance and Variation (ICSE Class 10 Botany) — 87 competency-based questions with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.Traits such as human height and skin colour, which are spread across a gradient and controlled by three or more genes, are called:
   • A.Pleiotropic traits
   • B.Polygenic traits
   • C.Co-dominant traits
   • D.Sex-linked traits
2. 2.In a typical test cross, an organism showing a dominant phenotype is crossed with:
   • A.A homozygous dominant individual
   • B.An F1 heterozygote
   • C.The homozygous recessive parent
   • D.Itself (self-crossing)
3. 3.Colour blindness (red-green) occurs in about 8 per cent of males but only about 0.4 per cent of females because:
   • A.The gene is dominant in males
   • B.It is an X-linked recessive trait and males have only one X chromosome
   • C.It is located on the Y chromosome
   • D.It is an autosomal dominant trait
4. 4.Phenylketonuria is cited in NCERT as an example of pleiotropy because the single mutated gene affects:
   • A.Only blood clotting
   • B.Mental development and pigmentation of hair and skin
   • C.Only the shape of red blood cells
   • D.Only flower colour
5. 5.All of the following are Mendelian disorders EXCEPT:
   • A.Haemophilia
   • B.Phenylketonuria
   • C.Thalassemia
   • D.Down's syndrome