How do algae reproduce?

Question

what is alternation of generation and an example of a species in which the generations are isomorphic and species in which the generations are different?

thanks :D

Answer 1

question 1 ) what is alternation of generation?

Answer 1 )The Alternation of phases (or generations)describes the life cycle of plants, fungi and protists.

A multicellular diploid phase alternates with a multicellular haploid phase.

The term can be confusing for people familiar only with the life cycle of a typical animal.

A more understandable name would be "alternation of phases of a single generation" because we usually consider a generation of a species to encompass one complete life cycle.

The life cycle of organisms with "alternation of generations" is characterized by each phase consisting of one of two distinct organisms: a gametophyte (thallus (tissue) or plant), which is genetically haploid, and a sporophyte (thallus or plant), which is genetically diploid.

A haploid plant of the gametophyte generation produces gametes by mitosis.

Two gametes (originating from different organisms of the same species or from the same organism) combine to produce a zygote, which develops into a diploid plant of the sporophyte generation.

This sporophyte produces spores by meiosis, which germinate and develop into a gametophyte of the next generation.

This cycle, from gametophyte to gametophyte, is the way in which all land plants and many algae undergo sexual reproduction. THIS IS CALLED ALTERNATION OF GENERATIONS !!!

For more details click on the link below -

http://en.wikipedia.org/wiki/Alternation...

Question 2 ) -How do algae reproduce?

Answer 2 ) - Algae is a vast group ranging from uncellular , microscopic to multicelluar and huge species .

They reproduce in many different manners  Sexual as well as Asexual.

Question 3 ) -An example of a species in which the generations are isomorphic ?

Answer 3 ) Isomorphic A .Of G . In which Haploid and the Diploid phases are morphologically Identical is rare and found in  a Brown alga called Ectocarpus .

click the link for more -

http://io.uwinnipeg.ca/~simmons/2152web/...

http://www.marine-genomics-europe.org/up...

Question 4 ) Species in which the generations are different?

Answer 4 ) These are very very many and found in All

Bryophytes , Pteridophytes , Gymnosperms and Angiosperms .

Below is an illustration of  fern  life cycle .

http://users.rcn.com/jkimball.ma.ultrane...