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Bio Lab Wksht & HW Questions 49

Bio Lab Wksht & HW Questions 49 - the archegonium...

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44 View the living fern gametophytes, called prothalli (singular: prothallus ), available on demonstration. The prothalli are bisexual, free-living and photosynthetic. At maturity, the prothallus is flat and heart-shaped. Examine the lower surface for rhizoids , antheridia and archegonia . What is the function of each of these structures? You may need to consult prepared slides to observe the reproductive structures. On the slide there are two prothalli, one with archegonia and one with antheridia. Both develop on one prothallus, but not at the same time (prevents inbreeding). Draw a fern gametophyte and label the structures. Sperm are released from the antheridia, swim to the neck of
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Unformatted text preview: the archegonium and then travel down to the egg. The fertilized egg, termed the zygote , then develops into a sporophyte. The sporophyte initially is attached to and dependent upon the gametophyte for nutrients, but soon becomes free-living, while the gametophyte shrivels and dies. Examine prepared slides of young sporophytes to illustrate this relationship and make a sketch in the space to the right. Human embryos are retained in and protected by the female reproductive organ. How does a fern plant approximate this condition? What does this retention of the zygote and subsequent embryo development seem to be an adaptation to?...
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