scject~~

1. Which of the following statements about  meiosis is correct ?



A.   Two daughter cells are formed in meiosis.

B.     The chromosomes replicate twice in meiosis.

C.     The daughter cells formed in meiosis are genetically identical.

D.     The daughter cells formed in meiosis have the same chromosome number.


2. In the fruit fly, red eye is dominant to white eye. A pure-breeding white-eyed fruit fly is crossed with a pure-breeding red-eyed fruit fly. The expected phenotypic ratio among the offspring is



    A. white eye: red eye = 1
    B. white eye: red eye = 1:4
    C. white eye: red eye = 1:2
    D. white eye: red eye = 0

　

3. Which of the following body characteristics of humans can be inherited ?



    (1) short sight
    (2) colour blindness
    (3) night blindness



A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)