Class 10 Science - ICSE-BIOLOGY
Genetics
The 'Genetics' chapter in ICSE Class 10 Biology introduces students to the fascinating science of heredity and variation. It covers Gregor Mendel's pioneering hybridization experiments on pea plants, laying the foundation for how traits are passed from parents to offspring. Students will learn core terminology like genes, alleles, genotype, and phenotype, alongside fundamental laws of inheritance. Practical problem-solving involving Monohybrid and Dihybrid crosses using Punnett squares is heavily emphasized. This chapter is a high-scoring and critical component of the board exams, frequently featuring direct theoretical questions and multi-mark analytical cross problems.
Start Learning FreeKey Concepts
Heredity and Variation
Heredity is the transmission of characters from parents to offspring, while variation refers to the differences shown by individuals of the same species.
Genotype and Phenotype
Genotype is the genetic makeup of an organism, whereas phenotype is the observable physical or biochemical characteristic resulting from the genotype and environment.
Monohybrid Cross
A genetic cross that studies the inheritance of a single pair of contrasting characters, leading to Mendel's Law of Segregation and a 3:1 phenotypic ratio in the F2 generation.
Dihybrid Cross
A cross that tracks the inheritance of two pairs of contrasting characters simultaneously, illustrating Mendel's Law of Independent Assortment with a 9:3:3:1 phenotypic ratio.
Sex Determination in Humans
The process by which the sex of a human offspring is determined by the chromosomes (XX for female, XY for male) contributed by the parents, with the male sperm determining the sex.
Important Formulas
Board Exam Info
In the ICSE Class 10 Biology board examination, the Genetics chapter typically carries around 8 to 12 marks. Questions frequently include drawing Punnett squares for monohybrid or dihybrid crosses, defining key biological terms, distinguishing between dominant and recessive traits, and solving pedigree or sex determination problems.
Frequently Asked Questions
Why did Mendel choose pea plants for his experiments?
What is the difference between homozygous and heterozygous conditions?
A homozygous individual has identical alleles for a trait (e.g., TT or tt), whereas a heterozygous individual has two different alleles for a trait (e.g., Tt).
How is the sex of a child determined in human beings?
Human females produce eggs with only the X chromosome, while males produce sperm with either an X or a Y chromosome. If an egg is fertilized by an X-bearing sperm, a female (XX) is born; if fertilized by a Y-bearing sperm, a male (XY) is born.
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