Moss Life Cycle Alternation of generations Zygote created from egg & sperm.
-
Upload
herbert-applegate -
Category
Documents
-
view
224 -
download
0
Transcript of Moss Life Cycle Alternation of generations Zygote created from egg & sperm.
Moss Life Cycle
Alternation of generationsZygote created from egg & sperm
Alternation of generationsZygote divides by mitosis to create adult sporophyte
Alternation of generations
Haploid spores created by meiosis
Alternation of generations
Haploid spores released into air
Alternation of generations
Female gametophyte creates eggs
Male gametophyte creates sperm
Spore grows into male or female gametophyte
Alternation of generations
Sperm & egg create diploid zygote
Alternation of generationsCycle repeats
Group 1: Seedless, Nonvascular Plants
• Most primitive of plants
• Live in moist environments– Swimming sperm
• Examples:– Liverworts– Hornworts– Mosses
Mosses• Because
nonvascular: Grow low to ground– Water transported by
simple diffusion
• Lack true leaves– only 1 cell thick
• Rhizoids anchor into soil
• Early inhabitant of new ecosystems (succession)
Moss Life Cycle• Gametophyte stage
– Dominant stage; Haploid
– Looks like mat of green shag carpet
Moss Life Cycle• Gametophyte stage
– Dominant stage; Haploid
– Looks like mat of green shag carpet
• Antheridium: produces male sperm
Male gametophyte(creates sperm)
Moss Life Cycle• Gametophyte stage
– Dominant stage; Haploid
– Looks like mat of green shag carpet
• Antheridium: produces male sperm
• Archegonium: produces female egg
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
Moss Life Cycle• Gametophyte stage
– Dominant stage; Haploid
– Looks like mat of green shag carpet
• Antheridium: produces male sperm
• Archegonium: produces female egg
– Sperm swims through water to fertilize egg
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
Moss Life Cycle• Gametophyte stage
– Dominant stage; Haploid
– Looks like mat of green shag carpet
• Antheridium: produces male sperm
• Archegonium: produces female egg
– Sperm swims through water to fertilize egg
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
Moss Life Cycle
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
stalk
• Gametophyte stage– Dominant stage; Haploid
– Looks like mat of green shag carpet
• Antheridium: produces male sperm
• Archegonium: produces female egg
– Sperm swims through water to fertilize egg
• Sporophyte stage– Stalk grows out of the
zygote
Moss Life Cycle
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
• Gametophyte stage– Dominant stage; Haploid
– Looks like mat of green shag carpet
• Antheridium: produces male sperm
• Archegonium: produces female egg
– Sperm swims through water to fertilize egg
• Sporophyte stage– Stalk grows out of the
zygote
– Haploid spores created inside capsule by meiosis
Moss Life Cycle
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
• Gametophyte stage– Dominant stage; Haploid
– Looks like mat of green shag carpet
• Antheridium: produces male sperm
• Archegonium: produces female egg
– Sperm swims through water to fertilize egg
• Sporophyte stage– Stalk grows out of the
zygote
– Haploid spores created inside capsule by meiosis
– Spores released and grow into new gametophytes
.....
Moss Life CycleSee appendix B in your text book
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
. .
Moss Life CycleSee appendix B in your text book
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
Moss Life CycleSee appendix B in your text book
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
Moss Life CycleSee appendix B in your text book
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
Moss Life Cycle
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygotesporophyte
Moss Life Cycle
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
zygote
capsule
stalk
Male gametophyte(creates sperm)
Female gametophyte (creates eggs)
sporophyte....
Moss Life Cycle
Place the steps of the moss life cycle in order, from the step started for you:
__ 1___ Spores land._______ Diploid sporophyte will grow from zygote._______ Through water, sperm swim from
antheridium (male gametophyte) to archegonium (female gametophyte).
_______ Moss gametophytes grow near the ground._______ Sporophyte will create and release spores._______ Fertilization occurs.
Kobe Kuiz1) Label the parts of the diagram.
2) Using the picture answer the following:
• Where are spores created?• Name the haploid stage.• Which grows from the zygote?
3) How are the antheridia and archegonia different? Similar?
4) Meiosis begins which stage of plants?
5) Fertilization begins which stage of plants?
6) How are haploid spores created?