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ICSE Class 10 Genetics and Heredity — practice questions — page 4

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 91–120 of 139.

A dihybrid F2 fits 9:3:3:1. Why need a sample of 16 not match it exactly?Read the answer and worked solution →Classical X-recessive haemophilia: carrier mother, unaffected father. Risk per son?Read the answer and worked solution →For X-linked haemophilia, why does an affected father not give his allele to sons?Read the answer and worked solution →Classical X-recessive haemophilia: affected mother, normal father. A son's risk?Read the answer and worked solution →A carrier woman and affected man have a daughter. In classical X-recessive haemophilia, risk?Read the answer and worked solution →A carrier's daughter has a normal father. In classical X-recessive red-green blindness, risk?Read the answer and worked solution →X-recessive red-green blindness: an affected son gets the relevant X allele from:Read the answer and worked solution →Haemophilia affects a protein involved mainly in which process?Read the answer and worked solution →In the usual human XX/XY model, an ovum carries which sex chromosome?Read the answer and worked solution →In the usual human XX/XY model, which fertilisation produces an XY zygote?Read the answer and worked solution →Assume equal, independent XX/XY outcomes. After two sons, the next child's XY chance is:Read the answer and worked solution →Which observation is an example of variation within one species?Read the answer and worked solution →Why may offspring produced asexually still differ slightly from their parent?Read the answer and worked solution →Sexual reproduction increases genetic variety chiefly by:Read the answer and worked solution →Which change is a mutation?Read the answer and worked solution →A pea is genetically Tt but is observed to be tall. Which label describes Tt?Read the answer and worked solution →Mendel's pea flowers had which contrasting positions?Read the answer and worked solution →Which pair describes the pea pod colours Mendel studied?Read the answer and worked solution →Mendel contrasted violet pea flowers with flowers of which colour?Read the answer and worked solution →Match each term to its meaningRead the answer and worked solution →Crossing a tall pea plant with a short one gives an F1 generation that is:Read the answer and worked solution →On self-pollinating the F1 tall plants, the short plants in F2 are about:Read the answer and worked solution →A trait that behaves like the T of a tall pea plant is called:Read the answer and worked solution →Which genotype gives a short pea plant?Read the answer and worked solution →Tall or short and round or wrinkled seeds in peas are inherited:Read the answer and worked solution →A section of DNA that carries information for one protein is called a:Read the answer and worked solution →A child who inherits a Y chromosome from the father will be a:Read the answer and worked solution →Which kind of reproduction generates the greater diversity?Read the answer and worked solution →Fossils found closer to the earth's surface are generally:Read the answer and worked solution →Green beetles came to outnumber red ones in the bush because:Read the answer and worked solution →

Worked practice questions

A dihybrid F2 fits 9:3:3:1. Why need a sample of 16 not match it exactly?

  1. Recessive alleles are lost
  2. Alleles blend in small groups
  3. Fertilisation involves chance
  4. Dominance changes each time
Show answer and solution

Correct answer: C. Fertilisation involves chance

The ratio describes expected probabilities rather than guaranteed counts in a small sample.

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Classical X-recessive haemophilia: carrier mother, unaffected father. Risk per son?

  1. 0%
  2. 100%
  3. 25%
  4. 50%
Show answer and solution

Correct answer: D. 50%

Each son receives his mother's normal or haemophilia allele with equal probability.

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For X-linked haemophilia, why does an affected father not give his allele to sons?

  1. Sons receive both
  2. Sons receive neither
  3. Sons receive his Y
  4. Sons receive his X
Show answer and solution

Correct answer: C. Sons receive his Y

A son inherits his father's Y chromosome rather than the X carrying the allele.

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