Alternation Of Generations Flashcards
What happens between generations of certain plants.
They alternate between diploid and haploid individuals
What happens in the diploid individuals?
They reproduce through meiosis
Sexual repro. - prod. of gametes followed by fertilization between genetically different individuals to produce
genetically different offspring
May use spores
What happens in the haploid individuals?
They reproduce through meiosis
Asexual reproduction
May use spores
What is a Sporophyte?
The diploid generation of a plant
Makes haploid spores through meiosis
These spores develop without fertilization
What is a Gametophyte?
The plant that haploid spores develop into
Produce male and female gametes that fuse at fertilization and develop into another sporophyte
What kind of generation is more dominant in Vascular Plants?
Diploid sporophyte
What kind of generation is more dominant in Non-Vascular Plants? I.E. Moss
Haploid gametophyte
What is the Gametophyte of Moss?
Leafy green mat produces sperm and egg
What is the Sporophyte of Moss?
Stalks that grow up from the mat only a few times a year
What is the Sporophyte for Conifers?
The tree itself
What is the Gametophyte of a Conifer?
Within smaller male cones and larger female cones
Female Gameto. devs. from a spore produced at the top of each of the cones and remains inside
Male Gameto. is released in the pollen to fertilize female gametes
Alternation of Generations summary. In which organisms is it found?
The Gametophyte produces gametes that join to form a zygote. The zygote develops into the Sporophyte that produces spores. Spores germinate and grow into a Gametophyte… and so on
AG only occurs in plants
Some animals alternate between sexual and asexual repro.
Jellyfish
Coral
Sea Anemones
2 distinct adult forms
A non-motile polyp
A free swimming (motile) Medusa
Dominant stage varies from species to species
