A pollen grain of corn with nuclei labeled M, N, O fertilized an embryo sac with nuclei labeled
R, S, T, U, V, W, X, & Y, as shown in the image:
** M is tube nucleus; RST are antipodals; X is egg nucleus; WY are synergids
a. Which of the 5 combinations could be found in the embryo? (1) MNO (2) NOX (3) UVN (4)
MW (5) OX. What is the basis of your choice?
b. Which of the above combinations could be found in the endosperm layer of the seed? Why?
c. Which of the nuclei, if any, in the pollen grain would contain genetically identical sets of
chromosomes? Give basis of your answer.
d. Which of the nuclei in the embryo sac would be chromosomally and genetically identical?
Why?
e. Which of the nuclei in these two gametophytes will have no descendants in the mature
seed?
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