Jamb Biology Questions - Inheritance of characters in organisms
Question 6:
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 F<sub style='font-size: smaller;'>1</sub> flies all short-winged and F<sub style='font-size: smaller;'>2</sub> flies all normal-winged
- B F<sub style='font-size: smaller;'>1</sub> flies all normal and F<sub style='font-size: smaller;'>2</sub> flies all short-winged
- C F<sub style='font-size: smaller;'>1</sub> flies all short-winged and three-quarters of F<sub style='font-size: smaller;'>2</sub> flies are short-winged
- D F<sub style='font-size: smaller;'>1</sub> flies all normal-winged and three-quarters of F<sub style='font-size: smaller;'>2</sub> flies are normal-winged
Question 7:
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
Question 8:
Which of the following characters is NOT sex-linked?
- A River blindness
- B Baldness
- C Haemophilia
- D Colour blindness
Question 9:
If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are
- A RR, 2Rr, rr
- B 2RR, 2rr, 2rr
- C 2RR, 2Rr
- D 4Rr
Question 10:
On what structure are the units of inheritance situated?
- A Golgi bodies
- B Ribosomes
- C Chromosomes
- D Endoplasmic reticulum