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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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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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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THE ABORTION BATTLE Title: Abortion: Killing a Human Being Topic: The ethics behind the practice of abortion and validating it as a murder Specific Purpose: To inform students of the scientific procedure of abortion and paralleling it to the killing of a human being‚ just in vivo (during conception). INTRODUCTION *ask class question‚ give disclaimer* Attention Materials: Mention the story of a Philadelphian doctor who committed wrongful abortions. Segue into the the fetus from conception to its
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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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the embryo inside of a woman is a living thing. The embryo has genetic make up from the time of creation‚ therefore it is a living thing. Brian Fisher states that‚”A zygote is a unique being that is distinct from the mother. He or she has 46 unique chromosomes and is internally driven to grow into more mature stages. Therefore‚ a zygote is fully human — as is an embryo‚ a fetus‚ and a born baby.” A embryo will
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teratogens are most likely to cause damage. In fact‚ teratogens can cause spontaneous abortion (miscarriage) if significant damage occurs during the pre-embryonic stage. QUICK 1. What is the postnatal period? The prenatal period? 2. What is a zygote? How is it
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