which of the following types of algae shows a distinct alternation of generations?
f5658ea691c3ef4fa218fa0eb242f4ec
Useful Notes on the Alternation of Generations in Algae This way, there is alternation of two haploid generations (gametophyte) with one diploid (sporophyte) generation. Such life-cycle is known as haplobiontic type of life-cycle. There is distinct alternation of generations in the higher red algae, e.g., Polysiphonia. The plants are different in their chromosome numbers as well as in functions. The sexual plants bear male and female sex organs on them, and the asexual plants bear tetraspores.
0efcff9befbe9dc85f43221cd0b0818d
Green algae Members of the class Chlorophyceae undergo closed mitosis in the most common form of cell division among the green algae, which occurs via a phycoplast. By contrast, charophyte green algae and land plants (embryophytes) undergo open mitosis without centrioles. Instead, a 'raft' of microtubules, the phragmoplast, is formed from the mitotic spindle and cell division involves the use of this phragmoplast in the production of a cell plate.
1faabeba5580ac15cb352187777b32e4
- 1 Red algae are unique among the algae in that flagellated cells are not formed during the life cycle. 2  The sexual reproduction is oogamous. 3  Sexual plants (gametophytes) produce either male sex organs called spermatangia or female sex organs called carpogonia.
7746c6b1d5a8a8a29319f1745b2753ae
Algae The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example, Spirogyra and the stoneworts. No definition of algae is generally accepted.
3e1358ae775bd961242ecd4a7fd27f73
--Chapt. Alternation of Generations. All Embryophytes and some algae undergo an Alternation of Generations. Each generation of offspring has a different ploidy than the generation before it. Generations alternate from diploid to haploid to diploid to haploid, etc. sporophyte (2n) --> gametophyte (n) --> sporophyte (2n) --> gametophyte (n) --> sporophyte (2n) etc... In short: 1. a haploid (n) gametophyte generates gametes (n) via mitosis 2. gametes fuse to form a diploid (2n) zygote 3. zygote grows mitotically into the sporophyte (2n) 4.
74ab81432946909e8c68336640c3b5d5
Alternation of generations Diagram showing the alternation of generations between a diploid sporophyte (bottom) and a haploid gametophyte (top). Typical moss: green haploid body and brown diploid sporophyte. The term alternation of generations is used to describe a process in the life cycle of some eukaryotes. It describes an alternation in forms which occurs in plants and some protists. One form is diploid, with 2 n chromosomes: the sporophyte. The other form is haploid with only one set of chromosomes: the gametophyte. Both forms are multicellular.
6634bcdf1335143e4143fad4245ceec2
Protista The life cycle of green algae is shown below. Haploid spores give rise to a multicellular haploid leaf-like structure called a thallus. The thallus produces gametes. Green algae are isogamus, meaning they have only one type of gamete, rather than having separate male and female gametes.aploid spores give rise to a multicellular haploid leaf-like structure called a thallus. The thallus produces gametes. Green algae are isogamus, meaning they have only one type of gamete, rather than having separate male and female gametes.
91a7dd3351b879c01ad1866bcce90263
- One trait used to classify algae is the type of. photosynthetic pigments they contain. Some algae have different forms of chlorophyll—a, b, and c—that absorb different wavelengths of light. Accessory pigments absorb light at different. wavelengths than chlorophyll, giving algae a variety. of colors.
afeadafbf4f5f1217616558b539d2004
The Life Cycle of Plants In bryophytes (mosses and liverworts), the dominant generation is haploid, so that the gametophyte comprises what we think of as the main plant. The opposite is true for tracheophytes (vascular plants), in which the diploid generation is dominant and the sporophyte comprises the main plant. Bryophyte Generations
51b8d73acba1763a0981103eed4cc80d
Alternation of generations Some species of red algae have a complex triphasic alternation of generations, in which there is a gametophyte phase and two distinct sporophyte phases. For further information, see Red algae: Reproduction.
7049395bbc77681cde1d027249f400d3
Algae The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae that includes, for example, Spirogyra and the stoneworts.ne definition is that algae have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells. Some authors exclude all prokaryotes and thus do not consider cyanobacteria (blue-green algae) as algae.
f903815469e63a2f928184f18a2d8206
Plant Biology Exam 4 a generalized life cycle seen in all land plants where both multicellular haploid and diploid stages occur, gametes are produced by mitosis and meiosis produces haploid spores spirogyra a genus of filamentous green algae commonly found in polluted water in this area where it forms slimy mats, the generic names come from the single chloroplast in each cell that form a helix
fbdddc6b75f8366dda03af7bc18a0b7f
- Brightfield Digital Image Gallery Filamentous Algae (Spirogyra) What appears to some as mere green pond scum masks the intricate and beautiful world of filamentous algae, which is clearly visible to the microscopist and botanist.hen the algae occur in highly fertile waters in thick mats, wide fluctuations in the dissolved carbon dioxide and oxygen concentrations of the water column can result in rapid changes in the water's pH, causing stress or even death to obligate aquatic organisms such as fish.
69e5a0297feb286006e24fd453905a22
Algae There is no generally accepted definition of algae. One definition is that algae have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells.he largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae that includes, for example, Spirogyra and the stoneworts.
57f07bffb5284a8a435f0e370db52f13
- Green algae are the most diverseof all of the algae types. Their body form may be unicellular, colonial, filamentous, or multicellular. Their method of sexualreproduction may include isogametes, heterogametes, or congugation.reen algae are the most diverseof all of the algae types. Their body form may be unicellular, colonial, filamentous, or multicellular. Their method of sexualreproduction may include isogametes, heterogametes, or congugation.
b9103a8d332e9acdf13e3eaeca524a29
Sporophyte Most algae have dominant gametophyte generations, but in some species the gametophytes and sporophytes are morphologically similar (isomorphic). An independent sporophyte is the dominant form in all clubmosses, horsetails, ferns, gymnosperms, and angiosperms (flowering plants) that have survived to the present day.
c61b9edc8a879ceaf26f22b325b1738a
Evolution of Plants These, along with the cyanobacteria (often misleadingly called blue-green algae), form the phytoplankton of aquatic ecosystems . Others, including all brown algae (Phaeophyta), most red algae (Rhodophyta), and many green algae are multicellular. The large marine forms of these phyla are usually called seaweeds. Plants are thought to have evolved from a class of freshwater green algae called the charophytes. Two particular groups of charophyte, the Coleochaetales and the Charales, resemble the earliest land plants (bryophytes) in a variety of ways, including the structure of their chloroplasts and sperm cells, and the way their cells divide during mitosis .
6a983f1d75eeaba752e0ab0fbde68a7c
- Characteristics of Algae. All algae are eukaryotic photoautotrophs that produce oxygen (except for the water molds, which are fungus-like chemoheteroptrophs). The thallus (body) of multicellular algae usually consists of a stipe, a holdfast, and blades. Algae reproduce asexually by cell division and fragmentation.Many algae reproduce sexually. Algae are classified according to their structures and pigments.hlorophyta. Green algae have cellulose and chlorophyll a and b and store starch. Bacillariophyta. Diatoms are unicellular and have pectin and silica cell walls: some produce a neurotoxin, domoic acid, that causes a rare syndrome known as amnesic shellfish poisoning (ASP).
bb1b6ff9d1547e4283f2679e146620b8
The Life Cycle of Plants In bryophytes (mosses and liverworts), the dominant generation is haploid, so that the gametophyte comprises what we think of as the main plant. The opposite is true for tracheophytes (vascular plants), in which the diploid generation is dominant and the sporophyte comprises the main plant.
550a86497be49d2d8803cab030ac2102
- All plants produce spores by meiosis; algae and fungi produce spores by meiosis or mitosis. This is called alternation of generation. In the lower plants, the gametophyte generation is the dominant stage; in higher plants, the sporophyte generation is the dominant stage. Four major groups of plants have evolved. The bryophytes are seedless and disperse via haploid spores. The ferns, gymnosperms, and flowering plants have vascular tissue.
2bc3481fe0d29da8924f8f6fe319cb8e
- The simplest filamentous algae consist of a thallus (body) of a single chain of cells. This is the result of cell division in one plane only.The filaments may be :- Unbrached filamentous forms :-Such type of thalli are found in many algae and consist of a straight row of cells. image1507. As a free living e.g.
892b365c3ba4af81af2290bbaafa497a
Kidney Transplant Transplant Evaluation The crossmatch is done by mixing your blood with cells from your donor. If the crossmatch is positive, you have antibodies against the donor and should not receive this kidney. If the crossmatch is negative, you don't have antibodies to the donor and you're eligible to receive this kidney.
688a4a77e5216dd6108c3a8110cb0759
MADMAN BIOLOGY Share this set. alternation of generations. A life cycle in which there is both a multicellular diploid form, the sporophyte, and a multicellular haploid form, the gametophyte; a characteristic of plants and multicellular green algae.
b82bb7ed97f62f4a93107eae903de99d
Classification of Protists The most abundant group of algae is the green algae. The green algae exhibit similar features to the land plants, particularly in terms of chloroplast structure. That this group of protists shared a relatively recent common ancestor with land plants is well supported.
c61f1c856979484967a6306ae4375701
Sporophyte: Definition & Examples Definition. All plants and some algae have a life cycle in which they undergo alternation of generations. This process involves a haploid multicellular generation called a gametophyte and a diploid multicellular generation called a sporophyte.
eebdb627e3bd54d3281191c8277d3790
Algae Algae constitute a polyphyletic group since they do not include a common ancestor, and although their plastids seem to have a single origin, from cyanobacteria, they were acquired in different ways. Green algae are examples of algae that have primary chloroplasts derived from endosymbiotic cyanobacteria.