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 below: (10 pts) 0 N M tube nucleus antipodals R U X egg nucleus S V W T Y synergids ** 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?

Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter10: Cell Reproduction
Section: Chapter Questions
Problem 1VCQ: Figure 10.6 Which of the following is the correct order of events in mitosis? Sister chromatids line...
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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 below: (10 pts)
0
N
M
tube nucleus
antipodals
R
U
X
egg nucleus
S
V
W
T
Y
synergids
** 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?
Transcribed Image Text: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 below: (10 pts) 0 N M tube nucleus antipodals R U X egg nucleus S V W T Y synergids ** 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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