(English Medium) ICSE Class 10 - CISCE Important Questions for Biology

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

(i) What is the phenotype and genotype of the F1 generation if a plant bearing pure axial flowers is crossed with a plant bearing pure terminal flowers?
(ii) Draw a Punnett square board to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers.
(iii) What is the phenotypic ratio and genotypic ratio of the above cross shown in (ii)?
(iv) State Mendel’s Law of Dominance.
(v) Name two genetic disorders commonly seen in human males.

find odd one from following: Typhoid, Haemophilia, Albinism, Colour blindness.

State the exact location of the Centromere

the Biological/technical term for The repeating components of each DNA strand lengthwise

the Biological/technical term for An alteration in the genetic material that can be inherited. 

Give scientific reasons : Colour blindness is more common in men than in women.

A homozygous tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous dwarf (t) plant bearing white (r) flowers :-
(i) Give the genotype and phenotype of the plants of F1 generation.
(ii) Mention the possible combinations of the gametes that can be obtained from the F1 hybrid plant.
(iii) State the Mendel’s law of Independent Assortment.
(iv) Mention the phenotypes of the off springs obtained in F2 generation.
(v) What is the phenotypic ratio obtained in F2 generation?

The cross between two parents having one pair of contrasting characters

Chromosomes get aligned at the centre of the cell during:
A. Metaphase
B. Anaphase
C. Prophase
D. Telophase

___________ is the scientific name of garden pea, which Mendel used for his experiments.

State Mendel’s law of Dominance.

In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r) : Draw a Punnett square to show the gametes and offspring when both the plants have heterozygous round seeds (Rr).

Mention the Phenotype and Genotype ratios of the offspring in F2 generation.

Name the sex chromosomes in human males and females

Briefly explain the term ‘Mutation’.

What is the number of chromosomes in the gametes of human beings?

Name the Following

The type of gene which is not expressed in the presence of a contrasting allele.

Give one example A nitrogenous base in DNA

Expand the following biological abbreviations : DNA

Explain Monohybrid cross