The binucleate crook cell would develop into the ascus and is called Ascus mother cells. The two nuclei in the ascus mother cell fuse to form one diploid nucleus. The cell that contains the diploid nucleus elongate. The diploid nucleus under goes meiosis ( reduction division) to give rise to four haploid nuclei. The four nuclei divide by mitosis to give rise to eight nuclei and these nuclei forms the nuclei of the eight ascospores which are contained in the ascus.
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Sept 27‚ 2010 Chapter 4 * With four valence electrons‚ carbon can form four covalent bonds with a variety of atoms * This tetra valence makes large‚ complex molecules possible * Fundamental groups: Alkanes and Alkenes * The electron configuration of carbon gives it covalent compatibility with many different elements * The valences of carbon and its most frequent partners (hydrogen‚ oxygen‚ and nitrogen) are the “building code” that governs the architecture of living
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Chapter 28 Question 1 1 out of 1 points A pregnancy test involves antibodies that detect GH levels in a woman’s blood or urine. Selected Answer: False Answers: True False Question 2 1 out of 1 points Sperm move to the uterine tube through uterine contractions and the energy of their own flagella. What other factor is involved in sperm movement? Selected Answer: reverse peristalsis of the uterus and uterine tubes
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Bio SOL * Safety * Rules in Lab- wear goggles‚ no food‚ drinks‚ gum‚ and candy in lab‚ no open-toed shoes‚ no chemicals or equipment can be removed from lab‚ teacher is absolute authority‚ contact lenses aren’t recommended‚ never hear a liquid in a closed container‚ stay out of prep room * Safety Equipment- shower and sinks * Scientific Investigation * Scientific Method * Observing a problem: variable-something that can change or vary‚ independent variable-
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caecilians and tailed frogs use internal fertilization just like reptiles‚ birds and mammals. The male deposits sperm directly into the female’s cloaca via an intromittent organ. Fertilization Entrance of the sperm initiates a sequence of events: * Meiosis II is completed. * The cytoplasm of the egg rotates about 30 degrees relative to the poles. * In some amphibians (including Xenopus)‚ this is revealed by the appearance of a light-colored band‚ the gray crescent. * The gray crescent forms
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of laggards were noted at Metaphase I‚ Anaphase I and II‚ Telophase I and II were 100% normal. These would indicate that lagging chromosomes were able to catch up‚ reached the opposite poles‚ and were included in daughter nuclei. Highly normal meiosis I and II resulted to high
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Symposis of General Embryology Professor Adel K.AbdelMalek MbChB‚MsC‚MMed‚Ph.D 2013 CONTENTS 1 Intoduction 1 2 Gametogenesis 5 Spermatogenesis 6 Oogenesis 9 3 Female reproductive cycles 12 Ovarian cycle 12 Menstrual cycle 15 4 Fertilization 18 Contraceptive methods 20 Infertility 21 Cloning 23 5 Early embryonic
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cell of an insect undergoing meiosis. Process X R: Centromere Q: Chromosome/ chromatid S: Nuclear membrane Diagram 1.1 (a) Label Q‚ R and S in Diagram 1.1. [3 marks] (b) 3m In the space below draw chromosome behaviour during metaphase I and metaphase II. 2m Metaphase I Metaphase II [2 marks] 2 PERFECT SCORE BIOLOGY 2011 (c) Explain how the process X involves in producing variation in organisms. P1 - During prophase Meiosis 1‚ crossing over occurs between
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Top of Form . The Male Reproductive System > The Male Reproductive System: Introduction The male reproductive system is composed of the testes‚ genital ducts‚ accessory glands‚ and penis (Figure 21–1). The dual function of the testis is to produce spermatozoa and hormones. The genital ducts and accessory glands produce secretions that‚ aided by smooth muscle contractions‚ conduct spermatozoa toward the exterior. These secretions also provide nutrients for spermatozoa while
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The 23rd Session of the International Poplar Commission The Mechanism of 2n Pollen Formatiom in Populus × euramericana and P. × popularis Speaker Jin-feng Zhang (Jennifer) zjf@bjfu.edu.cn Beijing Forestry University P.R.China OUTLINE 1 Introduction 2 Materials and Methods 3 Results and Analysis 4 Discussion 1 Introduction 1.1 Polyploid breeding is an important part in poplar breeding ● ● Triploid white poplar trees Triploid and aneuploid hybrids in Populus trichocarpa ×
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