Bio Term

925 words 4 pages
Show More
Lard WEeduck
Dr. Lerdkig
Lab Report #2
November 9, 2011
Lab Report: Environmental Control of Sex Determination
Introduction
Ceratopteris richardii, known as a C-fern has a lifecycle referred to as alteration of generations, which consist of neither haploid nor diploid dominant. C-ferns are homospours plants which are important in that they can produce hermaphrioditic gametophytes in order to be able to self fertilize. However, some of the homospourous C-ferns only produce male gametophytes .The life cycle of Ceratopteris richardii starts as a diploid sporophyte which then, by meiosis, produces haploid spores. These spores then undergo mitosis to produce a haploid gametophyte, which can be either hermaphrodite( producing eggs and …show more content…

The reason for this leveling out at the top of the graph was due to; if the percentage of male gametophytes kept increasing linearly, then there would be too many male gametophytes and not enough eggs being produced from the hermaphrodite gametophytes to be fertilized causing an unbalanced population. The outlier pertained to this because the population density was so high but the percentage of male gametophytes was relatively close to the other points supporting that male gametophyte production does not increase as population density increases. Even thought the population density was so high, the percentage of male gametophytes was relatively the same as the other points because the hermaphrodite gametophytes were trying to increase in number so that they could produce enough eggs to be able to self fertilize and reproduce with the male gametophytes, causing a leveling off in the graph. C-Ferns might have evolved this system of sex determination for many reasons. Being a hermaphrodite allows them to self fertilize, so by having this ability,C-ferns can produce eggs when there is sperm, so they always have the ability to reproduce. Unlike hermaphrodites, having separate sexes does not always guarantee you a parter so there is not guarantee in reproduction. Cross fertilization and self fertilization are important when discussing variation. Cross fertilization allows for different

Related

  • How Oil Prices Affect the Price of Food
    2677 words | 11 pages

    How Oil Prices Affect the Price of Food By Post Carbon | Wed, 21 December 2011 18:07 The current global food system is highly fuel- and transport-dependent. Fuels will almost certainly become less affordable in the near and medium term, making the current, highly fuel-dependent agricultural production system less secure and food less affordable. It is therefore necessary to promote food self-sufficiency and reduce the need for fuel inputs to the food system at all levels. The connection between….

    Show More
  • The Global Food Security Crisis
    2949 words | 12 pages

    In 2008 the United Nations declared a global food security crisis, but what exactly is food security? According to the Food and Agriculture Organization of the United Nations, food security “exists when all people, at all times, have physical, social, and economic access to sufficient, safe, and nutritious food to meet their dietary needs and food preferences for an active and healthy life” (FAO 2011). Based on the definition of food security, food insecurity is then defined as “a situation that….

    Show More
  • Air New Zealand essay
    3013 words | 13 pages

    1. Internal Analysis•Current resources, resource capabilities and/or resources potential to provide sustainable competitive advantage for the company. •Distinctive competencies and deficiencies and core competencies. •Key areas of competitive advantageThe VRIO analysis from the appendix suggests Air NZ (Air New Zealand) have only one resource that will provide them with sustainable competitive advantage and is a distinctive competency, this is the intangible resource of Air NZ being the national….

    Show More
  • Critical Analysis of Giorgio Agamben
    892 words | 4 pages

    Life That Does Not Deserve to Live, Giorgio Agamben aims to expand on Michel Foucault’s concepts of ‘biopower’ and ‘biopolitics’, to express the way in which the state has power over society in the way that ‘bare life’ is produced. He uses the Latin term homo sacer – literally translated to ‘sacred man’ – to describe a life which can be “eliminated without punishment” , one that possesses no value to the state and therefore can be terminated without the act being considered a crime. Examples of this….

    Show More
  • A Look Into the World of Anorexia
    945 words | 4 pages

    Perimeter College Abstract Eating disorders have become an increasing public health problem once thought to be an affliction amongst young women, now an epidemic across culture and gender boundaries. Anorexia gives rise to serious socio-economic and bio-psychological circumstances of our ever vast, growing society. Awareness of eating disorders have increased but perhaps only in proportion to its advancement of its research and treatment. That which still leaves us in a position for a much greater….

    Show More
  • The Pros and Cons of Plastic Use
    2736 words | 11 pages

    Sandra Lawson English 101 Jen Heckler 15March2013 To Use or Not to Use Plastic Grocery Bags an d Plastic Drinking Bottles. Most people if asked would say that they want to do the correct thing when it comes to their plastic waste. Every day the human race throws out millions of pounds of toxic waste in the form of plastic drink bottles and plastic grocery bags, for the most part, we do not do this maliciously; most people just do not know where to dispose of it other than the wastebaskets….

    Show More
  • Biopure Case Study
    2794 words | 12 pages

    approval Internal disruption Alternative 1-1 will utilize the marketing team already in place. It will also guarantee the highest return which will ensure management team satisfaction Long Term Viability While our recommendation emphasizes short term well being of Biopure. We believe that short term performance is vital for a….

    Show More
  • Rogerian Argument of Genetic Engineered Foods
    1146 words | 5 pages

    keep us healthy, the fuel we use to take us where we need to go, and even the food we eat and the sources it comes from, biotechnology already plays, and must continue to play, an invaluable role in meeting our needs. Biotechnology uses cellular and bio-molecular processes to develop technologies and products that help improve our….

    Show More
  • Ecology Lab 1
    3582 words | 15 pages

    Observing Plant Successional Changes in Old-Field Succession in Gatineau Park in Old Chelsea By Ghummaz Bhatti 4909040 Bio 2129 Section A2 Demonstrators: Paul Sokoloff Laura Robson November 11, 2009 Department of Biology University of Ottawa Abstract Patterns of plant successional change in Gatineau Park, Old Chelsea, were studied quantitatively. The relations between different successional stages of plant communities and abiotic factors were descried. To test these, we….

    Show More
  • Lab 8, Mitosis and Meiosis
    899 words | 4 pages

    Julie Lake November 8, 2012 BIO 111, C11- Online Villalpando, Shawn Lab 8 Title: Mitosis and Meiosis Exercise 1: Mitosis in Animal and Plant Cells Questions: A.) What is the purpose of mitosis? The purpose of mitosis is to create or produce more cells for a living organism. Mitosis occurs when genetic substance in the nucleus divides or separates in order to create more cells. Cytokinesis normally occurs next and the single cell develops into two separate cells. This same process continues….

    Show More

Popular Essays