What does alternation of generations refer to?
What does alternation of generations refer to?
alternation of generations, also called metagenesis or heterogenesis, in biology, the alternation of a sexual phase and an asexual phase in the life cycle of an organism. The two phases, or generations, are often morphologically, and sometimes chromosomally, distinct.
What are the two generations of alternation of generations?
Alternation of generations means that plants alternate between two different life stages, or generations, in their life cycle; a haploid stage called gametophyte and a diploid stage called sporophyte.
What is alternation of generations example?
The classic example is the mosses, where the green plant is a haploid gametophyte and the reproductive phase is the brown diploid sporophyte. The two forms occur together. In bryophytes and mosses, the gametophyte is the dominant generation and the sporophyte are sporangium bearing stalks growing from the gametophyte.
What does meiosis do in alternation of generations?
Sexual reproduction involves the two alternating processes of meiosis and fertilization. In meiosis, the chromosome number is reduced from the diploid to the haploid number. In fertilization, the nuclei of two gametes fuse, raising the chromosome number from haploid to diploid.
What is the alternation of generations quizlet?
A life cycle in which there is both a multicellular diploid form, the sporophyte, and a multicellular haploid form, the gametophyte; characteristic of plants.
Which of the following refers to the principle of alternation of generations in plants?
Which of the following refers to the principle of alternation of generations in plants? Explanation: Plants have a multicellular haploid stage called the gametophyte.
What form of reproduction is represented by alternation of generations?
The alternation of generations allows for both the dynamic and volatile act of sexual reproduction and the steady and consistent act of asexual reproduction. When the sporophyte creates spores, the cells undergo meiosis, which allows the gametophyte generation to recombine the genetics present.
How did alternation of generations evolve?
Evolution of the Alternation of Generations When the sporophyte creates spores, the cells undergo meiosis, which allows the gametophyte generation to recombine the genetics present. This allows for great diversity to arise.
Which is part of the alternation of generations life cycle quizlet?
A life cycle in which there is both a multicellular diploid form, the sporophyte, and a multicellular haploid form, the gametophyte; characteristic of plants. You just studied 36 terms!
What is the alternation of generations Why is it important for plants?
Plants alternate between the diploid sporophyte and haploid gametophyte, and between asexual and sexual reproduction. Therefore, the life cycle of plants is known as alternation of generations. The ability of the plants to reproduce sexually and asexually helps them to adapt to different environments.
Which of the following is part of the life cycle called alternation of generations?
The ‘alternation of generations’ in the life cycle is thus between a diploid (2n) generation of sporophytes and a haploid (n) generation of gametophytes.