ࡱ> lnk` ~!jbjb "`|c|c~++++ +n?,,,,,,,,>>>>>>>,$@RvBl?,,,,,?20,,(?202020,,,>20dxr,>2020 ;hI<, T9+$.u;I<>?0n?;B20B I<20$ 525S Assignment 1 Levels of Reasoning Laura Weis Part 1: Heredity and Mendel Seventh grade Types of ResoningQuestions ComprehensionGregor Mendel chose to study pea plants in the monastary garden. Explain two advantages that he had using pea plants that he would not have had using a different plant. A. Pea Plants have many traits that exist in only two forms so that it is easy to identify the genetic variance. They also have a lot of offspring in each plant so that it is easy to collect a lot of data. EvaluationThere are many reasons why a scientist will pick an organism to study for heredity traits. Evaluate two traits in an organism that you think are the most important in doing genetic heredity research. Explain your answer. A. Short regeneration time: easy to get large crosses for double trait studies. Large amount of offspring: easy to get a large data pool.  ApplicationIf you cross one pea plant that is short with another pea plant that is tall and has a genotype of Ss, what will be the genotypes and phenotypes of your resultant pea plants, in percentage. A. short plant ss Tall s s Plant S Ss Ss Ss s ss ss 50% Tall with 50% Ss 50% short with 50% ss SynthesisAssume that the plants that you got in question three all had yellow peas (YY). If you crossed the tall plants with other plants that were short and had green peas (yy), hypothesize the resultant phenotypes? All of the plants would be tall and some of the peas would be yellow. Some of the plants would be tall and some of the peas would be yellow All of the plants would be tall and all of the peas would be yellow Some of the plants would be tall and all of the peas would be yellow. A. d AnalysisIf the results of your two trait cross of plant height and pea color gave you a genotype ratio of 9:3:3:1, what were the genotypes of the parent plants. SSYY x SSYY SsYy x SsYy SSYY x SsYy ssyy x ssyy A. b KnowledgeWhat is heredity? The passing of traits from parent to offspring. The passing of traits from offspring to parent. The learning of traits from parent to offspring. The learning of traits from offspring to parent. A. a Part 2: Cells and Organelles Seventh Grade Level of ResoningQuestions and Answers EvaluationDecide upon the two most important organelles in the eukaryotic cell and explain why the cell could not function without these components. A. The nucleus houses DNA and controls all of the workings of the cell. It is the cells control center. The Mitochondria are the powerhouses of the cell. Without them, the cell would not have enough energy to do its jobs. SynthesisThink about a plant cell. How is it different from and animal cell? If animal cells (humans) had the organelles and components that plant cells have, how would our lives be different and why? A. Plant cells have cell walls, chloroplasts, large vacuoles, produce their own food. Our lives would be different because we would not be able to move as quickly (rigid cell walls), we would be green (chlorophill), we wouldnt have to eat food because we would make our own.  AnalysisCells in a multicellular organism are all the same. all different designed to do difrerent functions or jobs. designed to do the same funcion or job. c  KnowledgeCell membranes are important because . . . they create a barrier between the cell and the external environment they let everything come into the cell. they look pretty only some cells have cell membranes and they are better. A. a  ComprehensionProteins are the building blocks of life. They are made in the cell. Show, in a picture with labels, all of the organelles that are involved in making a protein. A. Ribosomes, Endoplasmic Reticulum, Golgi Apparatus  ApplicationEverything needs energy to survive. Cells have devised an organelle that provides them with energy called the Mitochondria. The Mitochondria takes food and breaks it down into usable energy for the cell. Which types of cells have the most mitochondria? brain cells skin cells muscle cells eye cells A. c Part 3: Cell Cycle Seventh Grade Level of ResoningQuestions and Answers KnowledgeWhat are the three stages of the cell cycle? Prophase, Interphase, and Metaphase Interphase, Mitosis, and Cytokinesis Mitosis, Anaphase, and Cytokinesis Interphase, Anaphase, and Telophase A. b Comprehension/ Analysis During Interphase, all of the DNA in each cell replicates, or makes a copy of itself. Why is it important that all of the DNA is copied before Mitosis? So that one cell has twice as much DNA and can do twice as much work. So that both daughter cells have all of the DNA to do work So that one daughter cell can give the harder jobs to the other cell, while keeping the easier jobs for herself. So that both daughter cells can choose which DNA they want to have and they will have twice as much to choose from. A. b. ApplicationIf you started with two dividing cells and they divided at a rate of one division per half hour, how many cells would you have after 5 hours? 10 cells 15 cells 20 cells 40 cells A. c AnalysisIdentify the second stage of Mitosis. What occurs in this stage and how does this prepare the cell for division? A. Metaphase. the chromosomes line up down the middle of the cell and attach to a spindle fiber. This lines up matching chromosomes and makes sure that when they separate, each daughter cell recieves one of each chromosome. It also gives the cell polarity, beginning the separation into two daughter cells. SynthesisWhen scientists first began to look at cells under microscopes, they had to mount the cells and stain them. By doing this, scientists could see dense organelles, like the nucleus, but by mounting and staining the cells, the cells would be killed. Scienists were looking at snapshots of cells, frozen in time. Most cells had giant, dark blobs in them, but some of them had Xs and distinct lines in them, like the diagram below. If you were a scientist looking at cells for the first time, how would you describe what you saw? Make a hypothesis and then give clear reasons for your explination. A. Cell division, different phases of Cell Cycle. Why, because progression between the phases and can see some cells beginning to separate with the lines from cells that hadnt separated. Half of the lines, different parts, and those cells that have dense organelles are not dividing. EvaluationWhy do you think cells divide this way? Is it efficient, do they expend a lot of energy, can it be fast? What are the advantages and disadvantages of dividing through Mitosis and is it something that organisms can survive withoug? A. Devloped over Billions of years. Efficient, most conservation of energy, can do fast. 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