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ICSE Class 10 Genetics and Heredity — practice questions — page 5

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 121–139 of 139.

Why is the low weight of a starving beetle not inherited?Read the answer and worked solution →The similar basic structure of limbs in mammals, birds and reptiles makes them:Read the answer and worked solution →How many pairs of human chromosomes are not the sex chromosomes?Read the answer and worked solution →Each germ cell must carry how many sets of genes?Read the answer and worked solution →The sex chromosomes of a woman are:Read the answer and worked solution →Very minor differences between bacteria after repeated division arise from:Read the answer and worked solution →For each trait, how many versions does a child carry?Read the answer and worked solution →Mendel studied inheritance by growing:Read the answer and worked solution →What did Mendel do first, that earlier students of inheritance had not?Read the answer and worked solution →Which pea plant is itRead the answer and worked solution →Blue beetles surviving because an elephant crushed the bushes is a case of:Read the answer and worked solution →Fill the gaps on heredityRead the answer and worked solution →True or false on heredityRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →Quick picks on heredity and evolutionRead the answer and worked solution →Variants are selected in a population by:Read the answer and worked solution →Free and attached earlobes in people are an example of:Read the answer and worked solution →Inherited or acquiredRead the answer and worked solution →Order Mendel's experimentRead the answer and worked solution →

Worked practice questions

Why is the low weight of a starving beetle not inherited?

  1. Germ cells divide too slowly
  2. Germ cell DNA is unchanged
  3. Germ cells are not yet formed
  4. Germ cells cannot store fat
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Correct answer: B. Germ cell DNA is unchanged

1. Germ cells are made in specialised reproductive tissue. 2. Starvation reduces the weight of the beetle but does not change the DNA of its germ cells. 3. Change in non-reproductive tissue cannot be passed to the germ cells, so it is not inherited. _Source: syllabus Science, Ch 9 'Heredity and Evolution'_

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The similar basic structure of limbs in mammals, birds and reptiles makes them:

  1. Hollow organs
  2. Hybrid organs
  3. Homologous organs
  4. Homogenous organs
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Correct answer: C. Homologous organs

1. Mammals, birds, reptiles and amphibians all have four limbs. 2. The basic structure is similar, though modified for different functions. 3. Such a homologous characteristic points to an evolutionary relationship. _Source: syllabus Science, Ch 9 'Heredity and Evolution'_

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How many pairs of human chromosomes are not the sex chromosomes?

  1. 22
  2. 12
  3. 42
  4. 32
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Correct answer: A. 22

1. Most human chromosomes have a maternal and a paternal copy. 2. There are 22 such pairs. 3. One further pair, the sex chromosomes, is not always a perfect pair. _Source: syllabus Science, Ch 9 'Heredity and Evolution'_

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