A flower‚ sometimes known as a bloom or blossom‚ is the reproductive structure found in flowering plants (plants of the division Magnoliophyta‚ also called angiosperms). The biological function of a flower is to effect reproduction‚ usually by providing a mechanism for the union of sperm with eggs. Flowers may facilitate outcrossing (fusion of sperm and eggs from different individuals in a population) or allow selfing (fusion of sperm and egg from the same flower). Some flowers produce diaspores
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BIO- FINAL EXAM REVEW SHEET This is a comprehensive review of material from exams 1-3. Please study your class notes/powerpoint slides and read the chapters listed in your syllabus to study for all new material. What are the characteristics of living organisms? Acquire and use energy Made up of other cells Process information Can replicate itself (can reproduce) Population evolves (they evolve) What are the characteristics of cells? Contain genetic information Can duplicate themselves
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into gene products. 2). Explain how nondisjunction may be related to Down syndrome. Describe four syndromes that result from inheritance of an abnormal sex chromosome number. During meiosis chromosomes are separated equally but if they are not separated equally this is known as non-disjunction in males meiosis I accounts for 80% of cases this is where gametes end up with either an extra chromatid or no chromatid. With Down syndrome the offspring carries an extra chromatid in Chromosome 21 which
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Unit 3 Lecture Study Guide 1. List the 4 primary tissue types and give the general characteristics and functions of each one. Epithelium- The epithelium protects us from the outside world. Skin‚ absorbs. Stomach and intestinal lining‚ filters. The kidney‚ secretes. Forming of glands‚ closely attached to each other forming a protective barrier‚ always has one free surface open to outside the body or inside an internal organ‚ has no blood vessels but can soak up nutrients from blood vessels in connective
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zygote also went through mitosis to develop the sporophyte. Mitosis is the process that creates haploid gametes‚ because it ensures the haploid gametes do not loose half of its chromosomes and cell data‚ which would be the result if it underwent meiosis (Hoefnagels.
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Spermatogenesis: In the male embryo‚ the spermatogenic cells are undifferentiated and are called spermatogonia; each contains 46 chromosomes. During spermatogenesis‚ these cells enlarge and become primary spermatocytes. These new cells undergo division by meiosis I and form haploid secondary spermatocytes with 23 chromosomes. These haploid cells divide again to form spermatids‚ each of which matures into a sperm cell. Describe the parts of a sperm. A sperm cell has a head containing the haploid nucleus
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Cri Du Chat Syndrome Introduction Cri du chat syndrome also known as 5p syndrome and cat cry syndrome - is a rare genetic condition that is caused by the deletion (a missing piece) of genetic material on the small arm of chromosome 5. Cri du Chat is a genetic disorder first described and named in 1963 by Jerome Lejeune. Cri-du-Chat means "cat’s cry" in French. The disorder causes the baby to produce a high pitched and cat like cry because of the structural abnormality and low
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BIO 181 SMCC General Biology Schedule* TuTh Fall‚ 2013 Bosch |Week/Date |Chap. & Topics/ Exams/ Outlines |Readings‚Quizzes&Reviews |Labs & Group Activities | |Wk1 Tu 8/20 |Syllabus & Ch1. Nature of Science |Read Ch.1. pp.4-5 & 11-24 |Lab Manual-Black Box-Sci. Process | |Th 8/22 |Ch.1 Nature of Science & Outline 1 |Finish reading the rest
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Evolution of Australian Biota 1. Evidence for the rearrangement of crustal plates and continental drift indicates that Australia was once part of an ancient super continent Identify and describe evidence that supports the assertion that Australia was once part of a landmass called Gondwana including: Matching continental margins Gondwana once consisted of South America‚ Africa‚ Madagascar‚ India‚ Antarctica‚ Australia‚ New Zealand and New Guinea. Continental margin: zone between the ocean basin
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the testes and are formed from cells by a type of cell division called mitosis and then meiosis. This process begins at puberty. Spermatogonia cells are made by mitotic division of the primordial germ cell. Mitotic cell division produces diploid cells that are identical to the Parent cell with 46 chromosomes. The Spermatogonia increases in size and mass and becomes a spermatocyte which then divides by meiosis. Meiotic cell division results in four haploid cells each with 23 homologous chromosome
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