Class 10 • Biology • Chapter 8
Heredity
True & False Quiz
Trait. Gene. Inherit.
✓True
✗False
25
Questions
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Ch.8
Chapter
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X
Class
Why True & False for Heredity?
How this format sharpens your conceptual clarity
🔵 Heredity explains why offspring resemble parents and why siblings differ — the foundation of genetics, medicine, and evolution.
✅ T/F tests Mendel's laws, dominant vs recessive traits, monohybrid cross ratios, and sex determination in humans.
🎯 The 3:1 phenotypic ratio appears only in F₂ generation of a monohybrid cross — NOT in F₁ (all dominant).
📋
Read each statement carefully. Click True or False — instant feedback with explanation appears. Submit anytime; unattempted questions are marked Skipped.
Q 1
Gregor Mendel is known as the Father of Genetics.
Q 2
Genes are made of proteins.
Q 3
Chromosomes are located in the nucleus of cells.
Q 4
The phenotype is determined only by the genotype, never by the environment.
Q 5
In humans, the sex of a child is determined by mother’s chromosomes.
Q 6
A dominant allele can mask the effect of a recessive allele.
Q 7
Mendel’s Law of Segregation states that alleles separate during gamete formation.
Q 8
A monohybrid cross studies the inheritance of two traits at a time.
Q 9
All genetic traits are inherited in simple dominant-recessive patterns.
Q 10
The gene for tallness (T) in peas is dominant over shortness (t).
Q 11
Variation among species is not necessary for evolution.
Q 12
Only inherited traits can be passed from parents to offspring.
Q 13
In humans, XX denotes a female and XY denotes a male.
Q 14
Mutations do not lead to genetic variation.
Q 15
All offspring of a pure tall (TT) and a pure short (tt) pea plant are tall.
Q 16
DNA is the hereditary material in most living organisms.
Q 17
Mendel used pea plants for his genetic experiments.
Q 18
Traits controlled by genes on X chromosomes are called sex-linked traits.
Q 19
All alleles code for the same protein.
Q 20
Codominance is when both alleles express themselves equally in the phenotype.
Q 21
Punnett Square is a device used to measure temperature of cells.
Q 22
Dihybrid cross produces a 9:3:3:1 phenotypic ratio in F2 generation.
Q 23
Phenotype refers to the observable traits of an organism.
Q 24
Homozygous genotype contains two identical alleles for a trait.
Q 25
The environment can never influence inherited traits.
Key Takeaways — Heredity
Core facts for CBSE Boards & exams
1
Mendel's Law of Segregation: alleles separate during gamete formation.
2
Dominant trait (expressed in Aa); Recessive trait (expressed only in aa).
3
Monohybrid cross F₂ ratio: 3 dominant : 1 recessive (phenotype); 1 AA : 2 Aa : 1 aa (genotype).
4
Dihybrid cross F₂ phenotype ratio = 9:3:3:1.
5
Sex determination: females = XX; males = XY — the father determines the child's sex.
6
Acquired traits (body changes during lifetime) are NOT inherited; only genetic changes are.