Surname Centre Number Candidate Signature Other Names Candidate Number Leave blank General Certificate of Education June 2004 Advanced Level Examination BIOLOGY/HUMAN BIOLOGY (SPECIFICATION A) Unit 5 Inheritance‚ Evolution and Ecosystems Tuesday 22 June 2004 Morning Session No additional materials are required. You may use a calculator. BYA5 For Examiner’s Use Number 1 2 Mark Number Mark Time allowed: 1 hour 30 minutes Instructions • Use blue or black ink or ball-point pen. • Fill in the boxes
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movie they used DNA from frogs which carry a similar strand of DNA as the dinosaurs did. And combined them to create a dinosaur DNA strand. Essentially‚ what they were doing was cloning the dinosaurs. However‚ they made sure to control a certain chromosome in which they were able to make sure that the dinosaurs were all female‚ they did this in order to prevent unauthorized breeding. However‚ one of the scientists that went to see if he was goig to endorse the park stated that “life will find a way”
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with two chromosomes. (20) Answer Question 11.6: Tabulate the key differences between mitosis and meiosis. (14) Answer: Mitosis Meiosis DNA replication occurs during DNA replication occurs during interphase before mitosis begins interphase before meiosis 1 begins One division Two divisions Synapsis does not occur Synapsis occurs during prophase 1 Two daughter cells‚ each 2n and Four haploid cells‚ each containing half genetically identical to parent cell as many chromosomes as the
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Detailed Solution Model Test 1 General Study Paper I 1. Bioasphalt is an asphalt alternative made from non-petroleum based renewable resources. These sources include sugar‚ molasses and rice‚ corn and potato starches‚ natural tree and gum resins‚ natural latex rubber and vegetable oils‚ lignin‚ cellulose‚ palm oil waste‚ coconut waste‚ peanut oil waste‚ canola oil waste‚ potato starch‚ dried sewerage effluent and so on. Bitumen can also be made from waste vacuum tower bottoms produced in the process
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Answer Lab Report and Post-Lab Quiz (below for your convenience). Virtual Lab: The Cell Cycle and Cancer Worksheet 1. In which phase of mitosis do each of the following occur: a. Centromeres split and chromosomes move toward opposite sides of the cell b. Chromatin coils to form visible chromosomes c. The nuclear membrane disappears d. Sister chromatids line up in the center of the cell 2. In which phases of mitosis are sister chromatids visible‚ and attached to each other at the centromere
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During which phase of the cell cycle does DNA duplication‚ or replication‚ take place? – interphase When a double helix of DNA is replicated‚ two complete helices are formed. Together‚ these helices are called sister __________. – chromatids During which phase of mitosis do sister chromatids line up at the center of the cell? – metaphase During which phase of mitosis do the sister chromatids move apart? – Anaphase During which phase of mitosis do nuclear envelopes and the nucleoli reappear?
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spindle fibers important for mitosis? (5 points) Spindle fibers work as a path for chromosomes to travel(Campbell‚ 2009). 2. State the four bases that make up DNA. (4 points) a. (A)-Adenine b. (G)-Guanine c. (T)-Thymine d. (C)-Cytosine (Campbell‚ 2009). 3. What are the two base pairs? (2 points) a. AG b. CT 4. Answer the following questions: a. Define the term crossing over. (3 points) The phase in meiosis where chromosomes exchange segments of genetic materials (Campbell‚ 2009). b. Explain why crossing
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over we must understand what happens in a controlled setting b.ii) The data that we collect will be used for comparison throughout the experiment c) Crossing over can result in three different types c.i) 4:4‚ 2:4:2‚ 2:2:2:2 c.ii) Since the chromosomes can cross over in different ways it results in different arrangements of asci d) Research Questions d.i) How does exposure to environmental stresses in the controlled conditions change the crossover frequency in the population of sordaria d
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dihybrid cross would have resulted in a 9 : 3 : 3 : 1 ratio. 4. Is the cross in Case 1 sex–linked or autosomal? Explain. Since the pattern seems to be the same for males and females‚ the inheritance is probably autosomal (the gene is not on a sex chromosome). 5. Based on the data obtained‚ is the most likely mode of inheritance in Case 2 autosomal or sex–linked? Explain. The pattern of inheritance is not the same for males and females (there are no females with white eyes). This is strong evidence
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Heidi Cabral Science – Down syndrome Group 1 Down syndrome is a genetic condition that causes a delay in a child development mentally and physically. In every Eight hundred babies one is effect by Down syndrome. Down syndrome can form widely from child to child. Down syndrome has two affects to the person meaning that the child might need a lot of medical attention or lead healthy lives. Down syndrome cannot be prevented but can be discovered before the child is born. The condition
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