Study Set Content:
Acetabularia length
5 centimeters (2 inches) long.
If the cap of an alga is removed and the nucleus is replaced with a nucleus taken from another species, the base regenerates a cap
identical to the previous one
. If this new cap is also removed, however, the next cap that develops shows
form characteristics of both species
If the intermediate cap is removed, the next one that develops is identical
to that of the species from which the nucleus originally came.
The original nucleus directs development of
cytoplasmic substances
when these are gone, the replacement nucleus
exerts its own influence.
multicellular seaweed with flattened, crinkly-edged green blades
Sea lettuce (Ulva)
Sea lettuc or
Ulva
what anchors the blades in ulva
basal holdfast
A basal holdfast anchors the blades, which may be either
haploid or diploid, to rocks
s produce spores that develop into haploid blades bearing gametangia
Diploid blades
The gametes from the haploid blades, fuse in pairs, forming zygotes, that potentially grow into
new diploid blades.
Except for the (blank)
the haploid and diploid blades of sea lettuce are indistinguishable.
the similarity in forms of organisms
isomorphism
branched, filamentous green alga whose species are represented in both fresh and marine waters,
its relatives are mostly multinucleate.
Cladophora
THE YELLOWGREEN ALGAE, GOLDEN BROWN ALGAE, DIATOMS, AND BROWN ALGAE
PHYLUM CHROMOPHYTA
PHYLUM CHROMOPHYTA members
THE YELLOWGREEN ALGAE, GOLDEN BROWN ALGAE, DIATOMS, AND BROWN ALGAE
number of members of Phylum Chromophyta are primarily microscopic,
7,600
bestknown representatives of PHYLUM CHROMOPHYTA
kelps and brown seaweeds
a floating brown alga from which the Sargasso Sea got its name is also found in other marine waters
Sargassum
