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Biology 1990 JAMB Past Questions

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31

In organism where the 2nd number of chromosomes is 16, the number of chromosomes in each gamete will be

  • A. 32
  • B. 16
  • C. 8
  • D. 4
View Answer & Discuss (5) JAMB 1990
32
What will be the result of the first filial generation (F1) and the second filial generation (F2) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant?
  • A. F1 flies all short-winged and F2 flies all normal-winged
  • B. F1 flies all normal and F2 flies all short-winged
  • C. F1 flies all short-winged and three-quarters of F2 flies are short-winged
  • D. F1 flies all normal-winged and three-quarters of F2 flies are normal-winged
View Answer & Discuss (7) JAMB 1990
33

What stage during cell division is represented in the figure above?

  • A. Prophase
  • B. Metaphase
  • C. Anaphase
  • D. Telophase
View Answer & Discuss (8) JAMB 1990
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34

An individual in the AB blood group is a universal recipient for blood donation because

  • A. all the red blood cells do not carry antigen
  • B. all the red blood cells carry antigen
  • C. all the red blood cells carry antigen
  • D. there are no anti-A and anti-B antibodies in the serum
View Answer & Discuss (3) JAMB 1990
35

Haemophilia results from the mutation of the genes

  • A. in the sex chromosome
  • B. which control skin colour
  • C. which control the mechanism for blood-clotting
  • D. which control the formation of haemoglobin
View Answer & Discuss (5) JAMB 1990
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