Kit Library / Science / Genetics and Breeding
⚡ Topic Learning KitShared by a Veda learner · Generated with Veda AI
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💡 Key Idea
Why you look like your parents.
Heredity is the transmission of characters (traits) from parents to their offspring.
↳ Heredity explains both why offspring resemble parents and why they are never exact copies.
📖 Definition
Master these five words first.
↳ These five terms are the vocabulary every heredity question is built on.
⭐ Important Fact
Genes don't float — they're packed.
Genes are located on chromosomes inside the nucleus. Each gene is a segment of DNA that carries instructions for a trait.
↳ A gene is a DNA segment; a chromosome is the carrier that holds many genes.
⚙️ Process
From parent to child in 4 steps.
↳ Offspring get half their genes from each parent — that's why traits blend but don't copy.
⚖️ Comparison
Same genes, different results.
↳ Heredity creates similarity; variation creates difference — both come from the same gene system.
⚠️ Common Mistake
Don't say 'same as parents'.
↳ Resemblance ≠ identical copy; gene mixing always produces variation.
✏️ Example
Why siblings still differ.
↳ Same parents, different gene combinations — that's why siblings aren't identical.
🌍 Real World
Heredity feeds and heals us.
↳ Heredity principles drive crop improvement, animal breeding, and genetic health studies.
🎯 Exam Tip
Two marks, two moves.
↳ Definition + example + gene location = a complete heredity answer.
🧠 Memory Trick
One chain, three links.
Nucleus → Chromosome → Gene → Trait
↳ Follow the chain from nucleus to trait to recall the whole heredity pathway.
Heredity is the passing of traits from parents to offspring through genes carried on chromosomes. It explains why offspring resemble their parents yet still show variation, and it forms the foundation of genetics.
Full explanation, worked examples & memory tricks in the app
All 15 questions, laddered from warm-up to topper-level, each with its answer and the reasoning behind it.
Q1. Which term describes the passing of traits from parents to offspring?
BeginnerC · Heredity
Heredity is the transmission of traits from parents to offspring; genetics is the study of heredity and variation.
Q2. Alternative forms of a gene are called:
BeginnerB · Alleles
Alleles are the alternative forms of a gene, such as T and t for plant height.
Q3. An organism carries how many alleles for each gene?
BeginnerD · Two
Each organism carries two alleles per gene, one inherited from each parent.
Q4. A plant with genotype Tt is best described as:
BeginnerC · Heterozygous
Tt has two different alleles, so it is heterozygous.
Q5. Mendel's monohybrid F₂ generation shows a phenotypic ratio of 3:1 (dominant : recessive) and a genotypic ratio of 1:2:1.
BeginnerA · True
Mendel's monohybrid F₂ generation shows a phenotypic ratio of 3:1 (dominant : recessive) and a genotypic ratio of 1:2:1.
Q6. In a Tt × Tt cross, what fraction of offspring are expected to be short?
IntermediateC · 1/4
The cross gives 1 TT : 2 Tt : 1 tt, so 1/4 are tt (short).
Q7. Which law explains why a gamete carries only one allele for each gene?
IntermediateA · Law of Segregation
The Law of Segregation states that the two alleles separate during gamete formation, so each gamete carries one allele.
Q8. A dihybrid F₂ cross produces which phenotypic ratio?
IntermediateB · 9:3:3:1
Mendel's dihybrid cross gave a 9:3:3:1 phenotypic ratio in the F₂ generation.
Q9. In a cross between two heterozygous tall plants (Tt × Tt), what is the genotypic ratio of the offspring?
IntermediateB · 1:2:1
The genotypic ratio is 1 TT : 2 Tt : 1 tt, i.e., 1:2:1.
Q10. Which of the following statements best explains why siblings can have different phenotypes despite sharing the same parents?
IntermediateD · They receive a unique combination of alleles from each parent.
The correct option is B. Siblings inherit a unique combination of alleles from each parent, which leads to different phenotypes. This genetic variation is a result of the segregation of alleles during gamete formation, allowing for diverse traits to be expressed.
Q11. Two identical twins have the same genotype but one is taller. Which statement best explains this?
AdvancedD · Phenotype depends on genotype and environment.
Phenotype = genotype + environment; identical genotypes can produce different phenotypes under different environmental conditions.
Q12. A student says recessive traits are always rare. What is the best correction?
AdvancedD · Recessive traits need two copies to show but can be common.
Recessive simply means the trait requires two recessive alleles to be expressed; it does not imply rarity or harm.
Q13. Mendel's Law of Independent Assortment is best demonstrated by which cross?
AdvancedD · A dihybrid cross of round-yellow × wrinkled-green
Independent assortment is observed when two traits are tracked together, as in a dihybrid cross producing a 9:3:3:1 ratio.
Q14. A breeder wants to develop a disease-resistant crop variety. Which principle is most directly applied?
AdvancedD · Heredity and Mendelian inheritance
Breeders use heredity principles, including Mendelian inheritance, to select and combine desirable traits such as disease resistance.
Q15. In a genetic cross involving two traits, a plant with genotype RrYy (where R = round seeds, r = wrinkled seeds, Y = yellow seeds, y = green seeds) is crossed with another plant of genotype RrYy. What is the expected phenotypic ratio of the offspring?
AdvancedA · 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green
The correct phenotypic ratio of a dihybrid cross (RrYy × RrYy) is 9:3:3:1, where 9 offspring will have round yellow seeds, 3 will have round green seeds, 3 will have wrinkled yellow seeds, and 1 will have wrinkled green seeds. This is a result of the independent assortment of all…
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