In the alternation of generations life cycle of plants‚ gametes are produced by the gametophyte. homospores. fruit. sporangia. strobili. Characteristics of eudicots include all EXCEPT two cotyledons. woody or herbaceous plants. leaves with netted veins. vascular bundles arranged irregularly in the stem. flower parts in fours and fives. Which plant structure is not found in the lycophytes? microphylls microspores archegonia rhizome Gymnosperm are characterized by producing "naked seeds". Which
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fertilization occurs‚ and then it is considered a fetus (Embryo). The development of the embryo is called embryogenesis. It always starts with the fertilization of the egg by the sperm. The fertilized egg is then referred to as a zygote (Embryogenesis). The zygote will go through mitotic divisions with no significant growth and cellular differentiation‚ which will lead to the development of the embryo
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every single one is attached to a kinetochore microtubule which comes from that pole. http://www.phschool.com/science/biology_place/biocoach/meiosis/metaii.html Fertilisation When fertilisation occurs 1 gamete from each of the parent joins to form a zygote this is due to the
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called a prothallus. Fern sperms then swim to the egg in the archegonium and produce a zygote. It develops into a new sporophyte. The life cycle of a typical gymnosperm include the dominant sporophyte. Gymnosperms usually have two different types of cones: male and female. The male cones have pollen grain‚ and the female cones have the ovules. The pollen gets to the female parts by the wind and forms zygote. Then eventually becomes a mature megastrobilus. . Water serves as a means to disperse
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female scales to a drop of fluid which evaporates moving the pollen closer to the megasporangium and then the scales close. Pollen tube then grows down into female gametophyte and the pollen divides into 2 sperm – one fertilizes the egg to produce a zygote and the other disintegrates. - Seed coat then surrounds embryo and wings develop for dispersal Pine Life Cycle: [pic] (Vodopich and Moore‚ pg 307) Leaves arranged in bundles (fascicles)
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approximately ____________ million years ago. Alternation of Generations lifecycle. Label the diagram below with the terms listed in the box Meiosis Fertilization Spores Haploid multicellular form (HF) Diploid multicellular form (DF) Zygote Embryo Gametes (egg + sperm) 1n 2n Being able to diagram the lifecycle will help you answer many questions such as… In plants through what process are spores always formed? ____________ (mitosis‚ meiosis‚ or fertilization)
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1. Plant breeders wanted to produce a better variety of tomato by selective breeding. Two plants‚ of the varieties Tangella and Piranto‚ were crossed. (a) Some flowers of each variety were covered with cellophane bags. The diagram shows a covered flower and a brush. (i) Explain why some flowers were covered with cellophane bags during the selective breeding. .......................................................................................................................... ........
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adoption available to couples‚ especially infertile couples. This new form of adoption utilizes the frozen stored zygotes from couples attempting pregnancy through In Vitro Fertilization (IVF)‚ the infertile couple may offer the zygote for “adoption” to another couple through an agency specializing in embryo adoption. The procedure allows the adoptive mother to be implanted with the frozen zygote through In Vitro Fertilization‚ resulting in her becoming the legal birth mother. It also enables her to be
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strains meet and fuse * plasmogamy: the union of the cytoplasm of the two gamete cells * karyogamy: the union of the nuclei * dikaryon (unfused) refers to the nuclei * fungus is all haploid‚ only diploid life cycle is the zygote. zygote undergoes meiosis to produce haploid spores for dispersal * molds: fungi in vegetative state (Deuteromycota/ fungi imperfecti * fungi are classified into 5 phyla * Chytridiomycota: spores with flagella * the rest
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is able to be transferred by wind due to its waterproof coating. The carpel of an angiosperm is the female reproductive structure‚ which produces female gametophytes with eggs. The carpel helps to create and ovule. The ovule protects the eggs and zygote‚ it is an a adaptation which increases reproductive fitness. Unlike angiosperms‚ mosses (bryophytes) have not achieved the widespread terrestrial success. They are not as successful as angiosperms due to the fact that they are non vascular. Non-vascular
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