Feb 7 Assignment 2 Answers

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Wichita State University *

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211

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Biology

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Feb 20, 2024

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Uploaded by ChancellorSteel13496

Biol 211 – In class assignment #2 Feb 7 2024 NOTE: THERE ARE TWO QUESTIONS ON THE BACK OF THIS SHEET. Names: _________________, __________________, _________________, __________________ 1. In one or two sentences, describe one major difference between the development of the angiosperm male gametophyte from the microsporocyte and the development of the angiosperm female gametophyte from the megasporocyte. In male gametophyte development, all four microspores that are produced by meiosis of the microsporocyte survive and develop into male gametophytes. In female gametophyte development, only one of the megaspores that is produced my meiosis of the megasporocyte survives and develops into female gametophyte, while the other three megaspores degenerate. 2. The oval below represents an angiosperm mature female gametophyte. Draw and clearly label the seven cells that make up the mature female gametophyte, specifically the egg cell, synergids, polar nuclei and antipodal cells. (2 pts) Antipodal cells Polar nuclei Egg cell Synergids

3. In three sentences or less, explain what happens during double fertilization in angiosperms. Be clear about what cells in the female gametophyte fuse with sperm cells and what the products of those fertilization events are. By ‘products of those fertilization events,’ I mean what structures result from those fertilization events? (3 pts) During double fertilization, both sperm cells produced by the male gametophyte fuse with cells / nuclei in the female gametophyte. One sperm cell fuses with the egg cell to produce a zygote (the next generation sporophyte). The second sperm cell fuses with both polar nuclei to produce the triploid endosperm (a nutritive tissue). 4. First, describe one difference between the embryos of eudicots and monocots (this difference is the reason why these two classes of angiosperms have their names). Second, in three sentences or less, describe how eudicots and monocots differ in how they protect the shoot apical meristem as it emerges from the soil. (3 pts) Embryos of eudicots and monocots differ in that eudicot embryos have two cotyledons whereas monocot embryos have a single cotyledon. Eudicots prevent the embryonic shoot apical meristem from being damaged as it emerges through soil by bending the hypocotyl and having that hook in the hypocotyl push through the over-topping soil, dragging the cotyledons and apical meristem behind it. Monocots protect their shoot apical meristem with a sheath, called a coleoptile, that pushes upward through the soil and the shoot grows up through the path cleared by the coleoptile.

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