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ICSE Class 10 Genetics and Heredity — practice questions — page 3

Explore 139 free Genetics and Heredity questions in ICSE Class 10 Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Genetics and Heredity questions and exercises with answers

Showing questions 61–90 of 139.

Which statement about the first Oldowan toolmakers is cautious?Read the answer and worked solution →What is the earliest stone-tool mode associated with Homo?Read the answer and worked solution →What is a core in Oldowan toolmaking?Read the answer and worked solution →What was a sharp edge of an Acheulean hand axe used for?Read the answer and worked solution →Which sequence best describes one simple flake-making action?Read the answer and worked solution →What does an Oldowan sharp tip help a tool do?Read the answer and worked solution →How are stone tools commonly grouped by archaeologists?Read the answer and worked solution →What caution applies to a fixed sequence of tool modes?Read the answer and worked solution →Which factor can make a fossil species identification difficult?Read the answer and worked solution →Fossil ages may be estimated by which methods?Read the answer and worked solution →Why should an early fossil ancestor claim be treated cautiously?Read the answer and worked solution →Why do fossils matter when studying human evolution?Read the answer and worked solution →What type of evidence is the fossil record especially useful for?Read the answer and worked solution →Which broader change accompanied the evolution of bipedalism?Read the answer and worked solution →What does the fossil evidence say about early human evolution?Read the answer and worked solution →What is one consequence of fossil scarcity for human evolution?Read the answer and worked solution →Which description fits the history of human tool technology?Read the answer and worked solution →In peas, T is dominant to t. Tt × tt gives what expected tall:dwarf ratio?Read the answer and worked solution →Two tall peas have a dwarf offspring (T dominant). What explains this?Read the answer and worked solution →T is dominant to t. A tall pea has a dwarf parent. Its genotype is:Read the answer and worked solution →What TT:Tt:tt ratio is expected from Tt × Tt with random fertilisation?Read the answer and worked solution →Why can TT and Tt peas both be tall when T is dominant?Read the answer and worked solution →At the height locus, which allele can a tt pea transmit in a gamete?Read the answer and worked solution →At one locus, a Tt pea forms gametes normally. What fraction carry T?Read the answer and worked solution →T is dominant to t. A tall pea crossed with tt yields a dwarf. The tall pea is:Read the answer and worked solution →A tall pea × tt gives eight tall offspring. With T dominant, TT is:Read the answer and worked solution →With tallness dominant, which tall pea can produce dwarfs on selfing?Read the answer and worked solution →An F2 has the Mendelian 9:3:3:1 ratio. What fraction shows both dominant traits?Read the answer and worked solution →For a 9:3:3:1 F2, add the classes expressing just one dominant trait.Read the answer and worked solution →In a 9:3:3:1 F2, the double-recessive class is expected to be:Read the answer and worked solution →

Worked practice questions

Which statement about the first Oldowan toolmakers is cautious?

  1. They were certainly Denisovans
  2. Their species is uncertain
  3. They were certainly Neanderthals
  4. They were certainly modern humans
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Correct answer: B. Their species is uncertain

Researchers have not settled which species first made Oldowan tools.

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What is the earliest stone-tool mode associated with Homo?

  1. Mode 2, Acheulean
  2. Mode 3, Mousterian
  3. Mode 4, Aurignacian
  4. Mode 1, Oldowan
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Correct answer: D. Mode 1, Oldowan

Mode 1 Oldowan tools are the earliest associated with Homo.

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What is a core in Oldowan toolmaking?

  1. A net woven for catching fish
  2. Parent stone that yields flakes
  3. A sharpened needle made from bone
  4. A handle carved for a wooden axe
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Correct answer: B. Parent stone that yields flakes

The core is the parent stone from which flakes are removed.

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