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
Premium Pregnancy Childbirth Abortion
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
Premium Chromosome X chromosome Y chromosome
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
Premium Plant Seed Pollen
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
Premium Flower Plant Pollen
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
Premium DNA Genetics Gene
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
Premium Chromosome DNA Down syndrome
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
Free DNA Cell Gene
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
Premium Plant Photosynthesis Leaf
Units of language on different levels are studied by traditional branches of linguistics as phonetics (that deals with speech sounds and intonation)‚ lexicology (treats the words‚ their meaning and vocabulary structure)‚ grammar (analysis forms of words)‚ syntax (analysis the function of words in a sentence). These areas of study are more or less clear-cut. Some scholars claim that stylistic is a comparatively new branch of linguistics‚ The term stylistics really came into existence not too long
Premium Narrative
Campbell’s Biology‚ 9e (Reece et al.) Chapter 31 Fungi Though fungal divisions have traditionally been based on modes of sexual reproduction‚ molecular considerations are becoming more important. Consequently‚ no emphasis has been placed on the vagaries of sexual and asexual reproduction among various fungi in this Test Bank. Instead‚ new questions assess students’ abilities to think logically about fungal morphology‚ genetics‚ and ecology. Two new sets of scenario questions deal with the biology
Premium Fungus Cell wall