moss life cycle diagram labeled

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Posted on August 29, 2020

[Note: If you consider the pollen grain to be composed of two cells, then the mature male gametophyte consists of three cells: An elongated, uninucleate tube cell or pollen tube containing two minute sperm cells.] This problem has been solved!

These tiny spores are dispersed so effectively by the wind that many mosses are worldwide in their distribution. Which of these represents the sporophyte generation of the moss life cycle?The sperm produced by mosses require _____ to reach an archegonium.In mosses gametes are produced by _____; in ferns gametes are produced by _____.Arrange the events in the life cycle of mosses in the flowchart below.Which of these was the dominant plant group at the time that dinosaurs were the dominant animals?Charophyceans are the green algae most closely related to plantsPlants evolved from green algae approximately _____ million years ago.The living plants that are most similar to the first plants to bear gametangia are the _____.Which of these characteristics is shared by algae and seed plants?

If meiosis I proceeds normally and nondisjunction occurs at meiosis II when the chromatids separate, it is possible to get gametes containing two single X chromosomes and gametes containing two single Y chromosomes: (Less common vernacular names include bird wheat and pigeon wheat.) All of this is happening within the ovule which increases in size and becomes the mature seed.

In the moss life cycle, fertilization takes place in the archegonium of the gametophyte. It consists of:During the summer, each spore mother cell undergoes meiosis, producing four haploid spores - the start of the new gametophyte generation. Sperm #2 fuses with the two polar nuclei (within the endosperm mother cell) to form the triploid endosperm (n + n + n = 3n). If a spore reaches a suitable habitat, it germinates to form a filament of cells called a Thus the gametophyte generation is responsible for sexual reproduction. The genus Polytrichum has a number of closely related sporophytic characters. If the doubled X and Y chromosomes move to the same cell at meiosis I, the resulting gametes will each contain single X and Y chromosomes. Unisexual flowers are either staminate (with one or more stamens) or pistillate (with one or more pistils). Multiple swimming sperm form in each antheridium. A single spore germinates to form a branched, filamentous protonema, from which a leafy gametophyte develops. A simple pistil is composed of one carpel, while a compound pistil is composed of several carpels fused together. Carpels are actually modified leaves which can be readily observed when certain fruits dry and split open. In the filamentous green alga (Summary of alternation of diploid with haploid phases in botany life cycles. Label the structures on this diagram of a moss. Each spore germinates and grows into a heart-shaped gametohyte (prothallus) which is smaller than your little finger nail. The arrow above shows a leaf segment or pinna with spore clusters or sori underneath. The general evolutionary trend (left to right) is a gradual increase in the diploid sporophyte phase and a decrease in the gametophyte phase. Upon reaching the embryo sac (inside the ovule), sperm #1 fuses with the egg to form a diploid zygote (n + n =2n). The sporophyte is the diploid phase of the alternation of generations, a method which allows sexual and asexual reproduction to prevent destructive genes to be reproduced. The life cycle of most mosses begins with the release of spores from a capsule, which opens when a small, lidlike structure, called the operculum, degenerates.

Sperm, which are released by the mature antheridium (the male reproductive organ), are attracted into the neck of an archegonium (the female reproductive organ). In the following diagram, normal spermatogenesis is compared with spermatogenesis with nondisjunction at meiosis I (anaphase I) and nondisjunction at meiosis II (anaphase II). Lichens are essentially fungi containing symbiotic algal cells. Here, one sperm fuses with the egg to produce the zygote. Remember that the diploid or 2 N organism looks like this. [citation needed]. The "male" stamen is composed of a pollen-bearing anther and a filament (stalk). This term also applies to flowers with multiple pistils, each composed of separate and distinct carpels. Show transcribed image text. The gametophyte bears organs for sexual reproduction. Although they all contain the same genes, they fall into two distinct groups with respect to the organization of their genes.However, the mitochondrial DNA of plants suggests a different evolutionary scenario. Because the relationship or "marriage" is beneficial to both partners, this particular example of symbiosis is classified as mutualism. In cross pollination, pollen is transferred from the anther of plant A to the stigma of a different plant B. Pollen is transferred by insects, wind and water. Fruits may be dispersed by the wind, seawater or hitchhiking on the fur of animals. In the common haircap moss, Polytrichum commune (shown here), there are three kinds of shoots: Female, which develop archegonia at their tip. This haploid gametophyte bears male and female sex organs (antheridia and archegonia). When the stem of a large clump of moss dies back, the stem-less clump becomes individual plants. With respect to populations of gametophytes, ferns are typically monoecious with both male and female sex organs on the same gametophytes.

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