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Alternation of generations

Definition of the noun alternation of generations

What does alternation of generations mean as a name of something?

noun

  1. the alternation of two or more different forms in the life cycle of a plant or animal

Explanation

Alternation of generations is a term primarily used to describe the life cycle of plants. A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which is diploid with 2n chromosomes, made up of n pairs. A mature sporophyte produces spores by meiosis, a process which reduces the number of chromosomes to half, from 2n to n. Because meiosis is a key step in the alternation of generations, it is likely that meiosis has a fundamental adaptive function. The nature of this function is still unresolved, but the two main ideas are that meiosis is adaptive because it facilitates repair of DNA damages and/or that it generates genetic variation.

Printed books with definitions for Alternation of generations

Click on a title to look inside that book (if available):

Google previewBiology, Concepts and Applications without Physiology (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewBiological Science (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewThe Dual Nature of Life (2005)

Interplay of the Individual and the Genome by Gennadiy Zhegunov

The alternation of generations is a striking phenomenon that is characteristic only of communities of living organisms, and it is an amazing property peculiar to life. It started from the moment of the origin of living bodies and it continues to this ...

Google previewConcepts of Biology (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewCampbell Biology in Focus (2016)

by CTI Reviews

Alternation of generations is a term primarily ...

Google previewCampbell Biology (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewBiology (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewBotany, An Introduction to Plant Biology (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewPolyploidy (2012)

Biological Relevance by Walter H. Lewis

do not transform to sexual allopolyploids with n and 2n alternation of generations is an interesting question. Gymnosperms.

Google previewBiology, Concepts and Applications (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewBiology, The Dynamic Science (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily used to describe ...

Google previewIntroductory Botany (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewBiology, Science for Life (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewThe Living World Basic Concepts (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewIntroduction to Botany (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewBiology, The Dynamic Science, Volume 2, Units 3, 4 and 7 (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewConcepts in Biology (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken ...

Google previewInvertibrate Zoology (2001)

by P.S.Verma

The term alternation of generations means that the individual exists in two distinct forms, which alternate each other regularly in the life history. One individual possesses the power to reproduce the other by asexual reproduction, which again ...

Google previewBiology, The Unity and Diversity of Life (2016)

Biology, Biology by CTI Reviews

Alternation of generations is a term primarily ...

Google previewPlant Biology (2016)

Biology, Botany by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is.

Google previewHolt Mcdougal Biology (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewEssentials of Biology (2016)

by CTI Reviews

Alternation of generations is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which ...

Google previewA Complete Course in ISC Biology (1997)

by V. B. Rastogi, B. Kishore

Alternation of generations is a regular feature in the life cycle of a multicellular plant where a gamete-bearing haploid gametophytic generation alternates with the spore-producing diploid sporophytic generation.

Google previewAdvances in Parasitology (1972)

Alternation of generations is the most singular feature of digeneans, but the account of its origin and development is the least satisfactory part of the present phylogeny, although it was the starting point of speculation. It may appear that ...

Google previewWorks: Principles of biology (1899)

by Herbert Spencer

Alternation of generations is a means of furthering multiplication. To be effective each member of either generation must be a self-supporting centre of growth or diffusion or both. Hence if, as in the Liverworts, one of the so-called alternating ...

Google previewThe Synthetic Philosophy of Herbert Spencer: Principles of biology (1899)

by Herbert Spencer

Alternation of generations is a means of furthering multiplication. To be effective each member of either generation must be a self-supporting centre of growth or diffusion or both. Hence if, as in the Liverworts, one of the so-called alternating ...

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Photo about Alternation of generations

Alternation of Generations

Red Algae showing alternation of generations.

Photo credit: jkirkhart35

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