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JCE (Botswana) Variation and Inheritance — practice questions

Explore 2 free Variation and Inheritance questions in JCE (Botswana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Variation and Inheritance questions and exercises with answers

Showing questions 1–2 of 2.

What defines a species?Read the answer and worked solution →In a herd, a few animals can run faster than the rest. Over many generations, what is likely to happen?Read the answer and worked solution →

Worked practice questions

What defines a species?

  1. Members breed fertile young
  2. Members share one colour
  3. Members live in one place
  4. Members eat the same food
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Correct answer: A. Members breed fertile young

1. Members of one species can breed with each other. 2. Their young must themselves be able to breed, which means fertile offspring. 3. That test is what marks the boundary of a species. 4. Colour, home and diet can all vary widely within a single species. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Variation within a species_

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In a herd, a few animals can run faster than the rest. Over many generations, what is likely to happen?

  1. Slow animals become common
  2. All animals become slower
  3. Fast animals become common
  4. All animals become smaller
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Correct answer: C. Fast animals become common

1. Predators catch the slower animals more often than the faster ones. 2. Faster animals are therefore more likely to live long enough to breed. 3. When they breed they pass the fast running feature to their young. 4. Slower animals leave fewer young behind them each generation. 5. So over many generations the fast feature spreads through the herd. 6. This gradual change through survival and breeding is natural selection. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Natural selection_

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