bio exam 1 virtual reviews

bio exam 1 virtual reviews - Q: I am a bit confused about...

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Q: I am a bit confused about this whole endosperm situation. The gametophytye in angiosperms is 2n (has "polar bodies") and then a sperm adds and it becomes 3n. How does the angiosperm end up having a 2n gametophyte in the first place? What are these "polar bodies"? A: You're getting waaaay too bogged down in the details. But since you asked. ... "Female gametophytes of flowering plants develop within the ovule contained within an ovary at the base of the carptel of the flower. There are usually eight (haploid) cells in the female gametophyte: a) one egg, b) two synergids flanking the egg; c) two polar nuclei in the center of the embryo sac; and d) three antipodal cells (at the opposite end of the embryo sac from the egg). The pollen tube grows through the stigma and style toward the ovules in the ovary. The germ cell in the pollen grain divides and releases two sperm cells which move down the pollen tube. Once the tip of the tube reaches the micropyle end of the embryo sac, the tube grows through into the embryo sac through one of the synergids which flank the
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This test prep was uploaded on 04/16/2008 for the course BIO 1402 taught by Professor Oberdeister during the Spring '08 term at SMU.

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bio exam 1 virtual reviews - Q: I am a bit confused about...

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