asexual reproduction. The growth and development of embryos occurs naturally in many plants‚ some invertebrate animal species and a few vertebrates. The offspring having all of the mothers genetic material are called full clones and they form without meiosis. This would mean that all offspring are female and would eventually eliminate the the male species. Humans should not partake in parthenogenesis because of the following: children of an asexual birth would not have a father‚ both organisms would be
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Introduction Genetics: the science‚ which deals with the principles of heredity and variation. Heredity: transmission of characters from parents to their off spring. Variation: Differences for various characters among the individuals of the same species. Types of variation: 1. Environmental and 2. Hereditary 1. Heredity variation: Variation observed among the individuals of the same species due to difference in their genetic constitution is termed as heredity variation. 2. Environmental variation:
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cells have 47 chromosomes but not all. This is rarer and only accounts for 1%. The third being translocation trisomy 21‚ where only a small section of an extra chromosome 21 is present in the cells that gets stuck to and copied to other cells during meiosis (National Institute of Child Health and Human Development 2015). The frequency of Down syndrome is seen to correlate with the age of the mother. Children to born to mothers under 30‚ the risk is 0.04%‚ however children born to mothers aged 40 the
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QUESTIONS Q1 DISCUSS THE CHROMOSOMAL BASICS OF SEX DETERMINATION The chromosomal basis of sex varies with the organism. In most species‚ sex is determined by the presence or absence of special chromosomes. As a result of meiotic segregation‚ each gamete has one sex chromosome to contribute at fertilization. Sex determination is strictly chromosomal and is not usually influenced by the environment. There are two types of sex namely Heterogametic sex: The sex that produces two kinds of gametes
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Chapter Learning Objectives Chapter 30: Plant Diversity II: The Evolution of Seed Plants Concept 30.1: Seeds and pollen grains are key adaptations for life on land • Name five terrestrial adaptations that contributed to the success of seed plants. 1) Seed 2) Reduction of gametophyte generation (dominant is sporophyte) -tiny gametophytes can develop in sporangia of the parental sporophytes which protect them from UV and from drying out 3) Heterospory (mega and micro) -mega- female‚ part
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Angiosperms have a wide distribution in the biosphere and the largest number of species in the plant kingdom. An angiosperm is seed plant that produces flowers and fruits. Angiosperms are divided into monocots and eudicots. They are classified in Anthophyta. There are four structures for reproduction found in angiosperms. These structures include fruits‚ petals‚ stamen‚ and carpel. Fruits‚ which are the matured ovaries of plants helps to disperse the seeds of angiosperms. By being tasteful‚ more
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an individual cannot be reverse because mutation that happen in the chromosomes or genes is irreversible. A chromosome mutation is an unpredictable change that occurs in a chromosome. These changes are most often due to problems that occur during meiosis which is cell division process of gametes or by mutagens such as chemicals and radiation. Chromosome mutations can result in changes in the number of chromosomes in a cell
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DiGeorge Syndrome: A Study in Chromosomal Errors DiGeorge syndrome is an anomaly that occurs when the 22q11.2 chromosome has been deleted‚ causing many different symptoms in various parts of the body. Those affected by DiGeorge syndrome often display signs of heart disease and defect at birth‚ presence of "cleft" palate (opening in the roof of the mouth)‚ learning disorders‚ autoimmune diseases (such as rheumatoid arthritis)‚ hypocalcaemia (low presence of calcium in blood)‚ speech disabilities
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chloroplast and chlorophyll‚ which is the method for gaining nutrients and performing transpiration. Plants are also identified by their ability to carry out alternation of generations‚ which means that plants are capable of performing both mitosis and meiosis in order to reproduce sexually (http://en.wikipedia.org/wiki/Alternation_of_generations ). Another way to identify plants is if they are deciduous or evergreen‚ and what the leaf pattern looks like. Netted or parallel leaves can identify the type
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Leanne Butler 02-12-09 Anatomy and Physiology Introduction to the Human body Introduction The human body is such an interesting machine‚ the way it is structured and how it works is educational. There is so much to learn about the human body and up until today scientists are still under going medical research. There are a lot of questions people would like to know about how their body works. The report will include
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