Table of Contents
What is the role of each generation in the alternation of generations life cycle?
Alternation of generations describes a plant’s life cycle as it alternates between a sexual phase, or generation and an asexual phase. The sexual generation in plants produces gametes, or sex cells and is called the gametophyte generation. The asexual phase produces spores and is called the sporophyte generation.
What is the adaptive significance of alternation of generations in the major groups of plants?
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.
What is alternation of generation in animals?
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 type of reproduction occurs in an alternation of generations life cycle?
Alternation of generations allows for both asexual and sexual reproduction. Beginning with the diploid sporophyte, spores form from meiosis. Asexual reproduction with spores produces haploid individuals called gametophytes, which produce haploid gametes by mitosis.
How does the animal life cycle differ from the alternation of generations exhibited by plants?
Animals, such as humans, have a diploid-dominant life cycle. In the alternation of generations life cycle, there are both haploid and diploid multicellular stages, although the haploid stage may be completely retained by the diploid stage. Plants have a life cycle with alternation of generations.
What happens in alternation of generations?
Alternation of generations (also known as metagenesis or heterogenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct haploid sexual and diploid asexual stages. The haploid spores germinate and grow into a haploid gametophyte.
What is sporophyte and gametophyte?
The multicellular diploid plant structure is called the sporophyte, which produces spores through meiotic (asexual) division. The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes.
What is alternation of generation in Pteridophytes?
Alternation of generations (also known as metagenesis) is the type of life cycle that occurs in pteridophytes and other plants. They have distinct sexual haploid and asexual diploid stages.
How do Telophase 1 and metaphase 2 differ during meiosis in animal cells?
How do telophase I and telophase II differ during meiosis in animal cells? Cells remain diploid at the end of telophase I, but are haploid at the end of telophase II. Daughter cells form a cell plate to divide during telophase I, but divide by cytokinesis during telophase II.
What are the alternative of generation in plant?
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.
Why is it called alternation of generations?
The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes. The fluctuation between these diploid and haploid stages that occurs in plants is called the alternation of generations.
What is a sporophyte generation?
Definition of sporophyte : the diploid multicellular individual or generation of a plant with alternation of generations that begins from a diploid zygote and produces haploid spores by meiotic division — compare gametophyte.