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Science

Heredity and Evolution

This Class 10 Science topic from the chapter “World of Living” explains how traits are passed from parents to offspring through genes and chromosomes. Students explore Mendel’s experiments, dominant and recessive traits, inherited variation, and the basic idea of sex determination in humans. The topic also introduces evolution, showing how variations, natural selection, fossils, and similarities or differences among organisms help us understand the gradual development of life over generations.

Expert · Level 1 · 6 questions

TOPIC PRACTICE

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  1. It reduces interbreeding between groups and allows different variations to accumulate
  2. It immediately makes all organisms identical
  3. It removes all genes from both groups
  4. It completely stops evolution
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  1. Because a new species is established when separated groups can no longer produce successful fertile offspring
  2. Because distance always removes chromosomes
  3. Because distance makes all organisms identical
  4. Because reproductive isolation is unrelated to evolution
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  1. Because similarities must be considered along with fossils, structures, embryology, and other evidence
  2. Because classification has no relation to organisms
  3. Because classification is based only on colour
  4. Because classification makes all organisms one species
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  1. Because similar functions can produce external similarity even when the basic structures differ
  2. Because outer appearance is always complete proof
  3. Because internal structure has no importance
  4. Because all similar organs come from one ancestor
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  1. Because inherited changes alter trait frequencies in populations over generations
  2. Because an individual can never show any change
  3. Because populations do not reproduce
  4. Because evolution is completed within one organism's lifetime
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  1. Genes carry traits forward and inherited variations guide evolution through selection, drift, isolation and time
  2. All traits learned during life pass directly to offspring
  3. Evolution occurs without variation and without time
  4. Offspring has no genetic relation with parents

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