Heredity
Class 10 · Science
4 ideas in Class 10 Science, explained in plain words, with games and quizzes to practise.
Variation Across Generations
Part of: Inheritance and Variation
Offspring resemble their parents but are not always identical. Small differences can be copied into later generations, and environmental conditions can affect which variants survive.
Why it matters. Variation helps explain both similarity within a species and why some individuals cope better when surroundings change.
Try it in two minutes
- Compare two leaves or seeds and name a feature they share.
- Name one difference between them.
- Ask how a difference might matter if the surroundings changed.
Try at home. Observe two plants of the same kind and list one shared trait and one difference.
Dominant and Recessive Traits
Part of: Inheritance and Variation
Mendel crossed pea plants with contrasting traits. In his example, all first-generation plants were tall, while short plants appeared again in the next generation. This showed that a trait can be present without being visible.
Why it matters. The pattern helps distinguish an inherited version of a trait from the version that appears in an organism.
Try it in two minutes
- Use two different coloured counters as versions of a trait.
- Show that one visible version can appear when both versions are present.
- Ask what combination would show the other version.
Try at home. Draw a simple two-generation trait chart with two versions and label which is visible in each combination.
Genes, Chromosomes and Trait Combinations
Part of: Genes and Chromosome Inheritance
Genes are DNA sections that carry information used to make proteins. Proteins can affect traits, such as plant height. In sexual reproduction, gene versions from both parents can combine in new ways.
Why it matters. This links inherited information to visible characteristics and explains why offspring can have new combinations of traits.
Try it in two minutes
- Draw a simple chain: DNA section, protein, trait.
- Ask how a change to a protein-making instruction could affect a trait.
- Use two pairs of coloured cards to model inherited versions.
Try at home. Make a two-trait card model and see how different pairings create different combinations.
Human X and Y Chromosome Inheritance
Part of: Genes and Chromosome Inheritance
In the chapter’s description, most chromosome pairs have matching forms. The X and Y pair differs: females are described as XX and males as XY. An egg contributes X, while a sperm contributes X or Y.
Why it matters. This explains how the chromosome combination in a child forms and why either outcome is possible.
Try it in two minutes
- Draw an X card for the egg.
- Make two possible sperm cards, X and Y.
- Pair each sperm card with the egg card and name the resulting combination.
Try at home. Use paper cards to model the two possible chromosome combinations described in the chapter.
What your child will practise
- Dominant and Recessive Traits: Lab Explorer Quest (Collect the Answer)
- Genes, Chromosomes and Trait Combinations: Jungle Quick Fire (Quick Fire)
- Human X and Y Chromosome Inheritance: Mission Control Quest (Collect the Answer)
- Human X and Y Chromosome Inheritance: Ocean Puzzle (Clue Puzzle)
- Variation Across Generations: Desert Quick Fire (Quick Fire)
- Quiz: Dominant and Recessive Traits (8 questions)
- Quiz: Genes, Chromosomes and Trait Combinations (8 questions)
- Quiz: Human X and Y Chromosome Inheritance (8 questions)
- Quiz: Variation Across Generations (8 questions)