Unit 3 Chapter 3 (1st Secondary) Biology

67 Questions | Total Attempts: 37

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Unit 3 Chapter 3 (1st Secondary) Biology

Unit 3 Chapter 3 (1st Secondary) Biology


Questions and Answers
  • 1. 
    In Drosophila, XRXr is a ......
    • A. 

      White eyed male

    • B. 

      White eyed female

    • C. 

      Red eyed male

    • D. 

      Red eyed female

  • 2. 
    The number of sex chromosomes in the normal human sperm is .......
    • A. 

      46

    • B. 

      23

    • C. 

      1

    • D. 

  • 3. 
    The number of autosomes in the human ovum is ........
    • A. 

      46

    • B. 

      22

    • C. 

      23

    • D. 

      44

  • 4. 
    The chromosomal structure of the ovum in human is .......
    • A. 

      44 + XX

    • B. 

      22 + XY

    • C. 

      22 + X

    • D. 

      All the previous

  • 5. 
    Chromosome X differs from that of Y in .......
    • A. 

      Shape

    • B. 

      Size

    • C. 

      Number of genes it carries

    • D. 

      All the previous

  • 6. 
    The formation of the two testes in the fetus begins after about ............ weeks from fertilization
    • A. 

      8

    • B. 

      4

    • C. 

      6

    • D. 

      10

  • 7. 
    A turner female has a chromosomal structure of .........
    • A. 

      XY

    • B. 

      XO

    • C. 

      XXX

    • D. 

      XX

  • 8. 
    A male with a Down's syndrome results from the fertilization of a normal ovum by a sperm of ........
    • A. 

      22 + XY

    • B. 

      22 + Y

    • C. 

      23 + Y

    • D. 

      23 + X

  • 9. 
    The figure represents a karyotype of .........
    • A. 

      Klinefelter's syndrome

    • B. 

      Turner's syndrome

    • C. 

      Down's syndrome

    • D. 

      Normal male

  • 10. 
    Klinefelter's syndrome results due to the fertilization of an abnormal ovum having two X chromosomes by a sperm of ..........
    • A. 

      22 + X

    • B. 

      22 + Y

    • C. 

      44 + O

    • D. 

      44 + Y

  • 11. 
    The person having (45 + XY) is a ........
    • A. 

      Female with Down's syndrome

    • B. 

      Female with Turner's syndrome

    • C. 

      Male with a Down's syndrome

    • D. 

      Male with Klinefelter's syndrome

  • 12. 
    .......... is an example of sex linked traits.
    • A. 

      Colour of feathers in Andalusian Fowls

    • B. 

      Fur colour in mice

    • C. 

      Blood groups in Man

    • D. 

      Eyes colour in Drosophila

  • 13. 
    If a healthy man marries a colour-blinded woman, the disease will appear in .......... of their offspring.
    • A. 

      All of the males

    • B. 

      All of the females

    • C. 

      Half of the females

    • D. 

      Half of the males

  • 14. 
    A female suffers from a genetic hair falling, has a chromosomal structure of .......... (if B+ is the gene for hair falling).
    • A. 

      B+ B

    • B. 

      B B

    • C. 

      B B+

    • D. 

      B+ B+

  • 15. 
    When a healthy man marries a haemophylic carrier woman, the possibility of producing females with haemophilia disease is ........... %
    • A. 

      50

    • B. 

      25

    • C. 

      Zero

    • D. 

      100

  • 16. 
    The genes of early baldness in man are carried on ...........
    • A. 

      X chromosome

    • B. 

      Y chromosome

    • C. 

      X and Y chromosomes

    • D. 

      Autosomes

  • 17. 
    From the examples of sex linked traits we have .........
    • A. 

      Colour blindness

    • B. 

      Appearance of beard

    • C. 

      Genetic baldness

    • D. 

      Eye colour in human beings

  • 18. 
    From the examples of sex-influenced traits in human, we have .........
    • A. 

      Colour blindness

    • B. 

      Haemophilia

    • C. 

      Early (genetic) baldness

    • D. 

      Infantile paralysis

  • 19. 
    From the examples of sex-limited traits, we have
    • A. 

      Early baldness

    • B. 

      Appearance of beard

    • C. 

      Colour blindness

    • D. 

      Haemophilia

  • 20. 
    The ability of a female bird to lay eggs is a ...........
    • A. 

      Sex-limited trait

    • B. 

      Sex-linked trait

    • C. 

      Sex-influenced trait

    • D. 

      Mendelian trait

  • 21. 
    Red-green color blindness is X-linked in humans. If a male is red-green color blind, and each of his parents have normal color vision, which of the male's grandparents is most likely to be red-green color blind?
    • A. 

      Maternal grandfather

    • B. 

      Maternal grandmother

    • C. 

      Paternal grandfather

    • D. 

      Paternal grandmother

  • 22. 
    A couple has a female child with Tay Sachs disease, and three unaffected children. Neither parent nor any of the four biological grandparents of the affected child has had this disease. Tay Sachs disease is a genetic lethal disease that leads to death usually in early childhood. The most likely genetic explanation is that Tay Sachs disease is inherited as a/an ______________ disease.
    • A. 

      Sex-linked recessive

    • B. 

      Sex-linked dominant

    • C. 

      Autosomal recessive

    • D. 

      Autosomal dominant

  • 23. 
    Which of the following is not among the aims of the human genome project?
    • A. 

      Gene therapy for normalizing blood glucose levels

    • B. 

      Genetic testing for hemophilia

    • C. 

      Genetic testing for typhoid disease

    • D. 

      Evolutionary relationship

  • 24. 
    Alternation of the nucleotide sequence of a gene causes a change ------
    • A. 

      In the karyotype of somatic cells

    • B. 

      In the DNA finger print

    • C. 

      In the structure of the chromosome

    • D. 

      In the function of the protein formed by that gene

  • 25. 
    • A. 

      Colour blind male

    • B. 

      Hemophiliac male.

    • C. 

      Tall Pea plant

    • D. 

      Female carrier for colour-blindness.