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19. If a couple has two boys and one girl, what is the probability that the next child born to this couple will be

a girl?

(A) 1/4

(B) 1/3

(C) 1/2

(D) 2/3

(E) 3/4

20. Eggs fertilized by two sperm instead of onesome­ times form a mitotic spindle with three poles. After mitosis the daughter cells will probably

(A) be indistinguishable from normal cells

(B) eliminate the chromosomes contributed by the second sperm

(C) eliminate the chromosomes contributed by the egg

(D) display an abnormal number of chromosomes (E) stop protein synthesis immediately

21. In higher plant cells, a pigment important in the manufacture of carbohydrates from CO2 and H20 is contained in the

(A) nucleus

(B) vacuole

(C) cytoplasm

(D) chloroplast

(E) centrosome 

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