Geolab Essay

1368 Words May 21st, 2013 6 Pages
Chapter 38 Angiosperm Reproduction and Biotechnology
38.1
Q: Distinguish between pollination and fertilization.
A: In angiosperms, pollination is the transfer of pollen from an anther to a stigma. Fertilization is the fusion of the egg and sperm to form the zygote; it cannot occur until after the growth of the pollen tube from the pollen grain.

Q: What is the benefit of seed dormancy?
A: Seed dormancy prevents the premature germination of seeds. A see will germinate only when the environmental conditions are optimal for the survival of its embryo as a young seedling.

Q: If flowers had shorter styles, pollen tubes would more easily reach the embryo sac. Suggest an explanation for why very long styles have evolved in most
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A: this might be possible, but satisfactory results would be very unlikely. Both tuber and futis are tremendous energy sinks. Each plant has a only a finitie amount of energy to divide between sexual and asexual reproduction although ha tomato potatoes hybirid could, in theory produce offspring that makes fruits and tuber equally these fruits and tubers would be of inferior quality or low yielding.

Asexual reproduction enables successful plants to proliferate quickly. Sexual reproduction generates most of the genetic variation that make evolutionary adaptation possible.
Plants have evolved many mechanism to avoid self-fertilization including dioece (male and female flowers on different individuals, non synchronous production of male and female part within a flower, and self incompatibility reactions in which pollen grains that bear an allele identical to one in the females are rejected.
Plants can be cloned from single cells, which can be genetically manipulated before being allowed to develop into a plant.
Q: what are the advantages and disadvantages of asexual reproduction?
A: asexual reproduction can be advantageous in a stable environment because individual plants that are well suited to the environment pass on all their genes to offsprings. Also asexual reproduction generally results in offspring that are less

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