Class 10/Specimen Paper
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
ICSE Suggested Specimen Paper Based Preparation Guide
In pea plants, tall (T) is dominant to dwarf (t). If a heterozygous tall plant (Tt) is crossed with a dwarf plant (tt), what is the probability of producing a dwarf offspring?
A man with colour blindness (an X-linked recessive trait) marries a woman who is a carrier for the trait. What is the probability that they will have a colour-blind son?
Odd One Out: Homozygous, Heterozygous, Phenotype, Genotype.
Scenario: A farmer crosses two plants, one with red flowers and one with white flowers. All the offspring have pink flowers. Which of Mendel's principles is not demonstrated by this cross, and what is this pattern of inheritance called?
Haemophilia: The Royal Disease
Haemophilia is an X-linked recessive disorder that impairs the body's ability to make blood clots. It became famous as the "royal disease" because it affected many members of the European royal families, descended from Queen Victoria of England, who was a carrier. Because it is an X-linked trait, her male descendants had a 50% chance of inheriting the disease, while her female descendants had a 50% chance of being carriers. This case study is a classic example of human sex-linked inheritance, demonstrating how a single faulty gene on the X chromosome can be passed down through generations, with different consequences for males and females.
Assertion (A): The phenotypic ratio of a dihybrid cross in the F2 generation is 9:3:3:1. Reason (R): The alleles of two different genes are inherited independently of each other.
(a) Both (A) and (R) are true and (R) is the correct explanation of (A). (b) Both (A) and (R) are true but (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) (A) is false but (R) is true.
In a dihybrid cross, if two genes are located very close to each other on the same chromosome, they are said to be "linked." How would this linkage affect the results of the cross compared to what Mendel predicted with his Law of Independent Assortment? Would you still expect to see a 9:3:3:1 phenotypic ratio?
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