Presentation on theme: "Reproduction By Aimee Chavez. Sexual Vs. Asexual Sexual reproduction: ( Meiosis) 2 parents and one or many offspring with genetic diversity Examples:"— Presentation transcript:
Reproduction By Aimee Chavez
Sexual Vs. Asexual Sexual reproduction: ( Meiosis) 2 parents and one or many offspring with genetic diversity Examples: sperm + egg = zygote seed plants Asexual reproduction (mitosis) 1 parent and one or many offspring which are an exact copy of the parent.
Sexual vs. asexual
Mitosis & The Cell Cycle Reproduction of regular body cells such as skin cells. An exact copy is made.
Meiosis and Sex Cells Meiosis: a process that produces 4 sex cells (haploid) which have 23 chromosomes. Sperm or egg. Often there are mistakes during meiosis and a cell can have too few or too many chromosomes. I.e. Downs syndrome
Sprouting Some vegetables such as sweet potatoes which grow sprouts can reproduce asexually.
Strawberries form runners & fragmentation
Budding Some organisms such as hydra and sponges can reproduce through a process called budding.
Regeneration Sea stars, Planarians, Lizards can regrow a body part called regeneration.
Binary Fission Bacteria and amoeba reproduce via binary fission.
Bacteria: need food, temperature, and suitable living conditions Asexual: Binary fission. One cell divides to form two identical cells Sexual: some reproduce by conjugation where 2 parents who combine genetic information. No babies!
Fungi: spores are surrounded by a covering and are carried thru air and water. The spores are produced in fruiting bodies which are reproductive hyphae. Asexual: adequate moisture and food, reproduce by fruiting bodies that become spores Unicellular yeast uses budding where a small yeast cell grows from body and breaks off as a new organism. Sexual: unfavorable hyphae of two grow together and genetic material is exchanged, new spore producing structure grows from the formed hyphae
Protists: asexual or sexual Amoeba: asexual replicates nucleus and fission occurs Fungus like produce spores Sexual: stress like from environment offspring have better survival a gamete becomes a zygote
Plants: two stages or generations Sporophyte: produces spores and gametophyte: produces sex cells sperm and egg Spores gametophyte to sperm and egg zygote to sporophyte
Gymnosperm: cones and naked seeds needle like scale like deep roots Produces male and female cones Scale on female has 2 ovules male produces pollen grains that mature to sperm Egg cell develops inside ovules Wind scatters pollen which becomes trapped on sticky ovules Pollen produces a tube which grows into ovule sperm moves through and joins with the egg The ovule becomes a seed and egg becomes an embryo Wind disperses the seeds which become a seedling and a tree
Angiosperms: flowering plants Angiosperm produces flowers Inside ovary an egg cell is produced in each ovule cells in the anther produce pollen Pollen gets trapped in the stigma Pollen grains produced pollen tubes that grows into ovule a sperm cell moves through the pollen tube an joins with the egg cell Ovule becomes a seed and fertilized egg becomes and embryo Ovary becomes a fruit with seeds Seeds become a new plant
Sponges Sexual: sperm and egg make larva immature and looks different than adult Asexual: Budding
Cnidarians: polyps: budding sexual
Worms: sexual and asexual some are male and female Asexual: breaking into pieces, except earthworms which can only grow back tail : regeneration
Insects: Complete metamorphosis Egg female in moist place Larva egg hatch to larva Pupa sings legs antenna form protective case Crawls out unfurls wings exoskeleton hardens
Gradual metamorphosis Egg to soil Nymph looks like mini adult no wings Larger nymph molts Adult wings
Amphibians Frogs and toads have external fertilization salamander is internal Eggs have a clear jelly moist and protective Egg to legless tadpole to hind legs to frog to adult
Reptiles: eggs fertilized internally shell Birds: internal fertilization and lay eggs have harder shells Mammals: internal fertilization Young develop in mom feed with milk