Self Studies

Principles of I...

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  • Question 1
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : The chances of having a child with Down’s syndrome increases if the age of the mother is between 20 to 25.

    Reason (R) : The chances of having a child with Downs syndrome increases with the age of the mother because age adversely affects meiotic chromosome behaviour.

  • Question 2
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion : Number of chromosomes in one genome is equal to number of linkage groups.

    Reason : Two homologous chromosomes form a linkage group.

  • Question 3
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : Haemophilia is an autosomal disorder.

    Reason (R) : A haemophilic father can never pass the gene for haemophilia to his son.

  • Question 4
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion : In some Drosophila, bilateral gynandromorphs are found.

    Reason : Ihe gynandromorphs are formed by an irregularity in mitosis at the first cleavage of the zygote.

  • Question 5
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : The frequency of red-green colour blindness is many times higher in females than that in males.

    Reason (R) : In females if only one X-chromosome of female possess allele for colour blind character she becomes the colour blind.

  • Question 6
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion : Y chromosome causes maleness.

    Reason: If the number of X chromosome is more than one, femaleness dominates.

  • Question 7
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : Sickle cell anaemia is an example of point mutation.

    Reason (R) : It is caused by addition or deletion of nitrogenous bases in the DNA or mRNA.

  • Question 8
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion : Karyotypes study is used to detect of chromosomal aberrations.

    Reason: Karyotypes can be used to know the sex of unborn child.

  • Question 9
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : Crossing of F1 hybrid with the recessive parent is known as test cross.

    Reason (R) : Test cross helps to determine the unknown genotype by crossing it with the recessive parent.

  • Question 10
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : Crossing of F1 hybrid with the recessive parent is known as test cross.

    Reason (R) : Test cross helps to determine the unknown genotype by crossing it with the recessive parent.

  • Question 11
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : Grasshopper shows male heterogamety.

    Reason (R) : In grasshopper, males have one X only (XO type).

  • Question 12
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion : In birds, the chromosome composition of the egg determines the sex.

    Reason : Female birds are heterogametic.

  • Question 13
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : A cross between a red flower bearing plant and a white flower-bearing plant of Antirrhinum is a case of incomplete dominance.

    Reason (R) : This type of cross produces all plants having pink flowers.

  • Question 14
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion : Quantitative inheritance is called polygenic inheritance.

    Reason : Several genes control the expression of a trait.

  • Question 15
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    Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : The offspring of a cross made between the plants having two contrasting characters shows only one character without any blending.

    Reason (R): The factor controlling any character is discrete and independent.

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