1. Alleles are different versions of the same gene and one may be dominant to the other. –TRUE 2. In a dihybrid cross of a mother and father who are both heterozygous dominant for chin fissures and dimples‚ what would be the phenotypic ratio of chin fissures and dimples in their offspring? –-9:3:3:1 3. If two alleles are heterozygous‚ it means they are the same allele. --FALSE 4. If the letter ""C"" stands for the dominant allele for having a chin fissue and the letter ""c"" stands for the recessive
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Sept 27‚ 2010 Chapter 4 * With four valence electrons‚ carbon can form four covalent bonds with a variety of atoms * This tetra valence makes large‚ complex molecules possible * Fundamental groups: Alkanes and Alkenes * The electron configuration of carbon gives it covalent compatibility with many different elements * The valences of carbon and its most frequent partners (hydrogen‚ oxygen‚ and nitrogen) are the “building code” that governs the architecture of living
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Methods to elucidate gene function Historically‚ studies to identify genes that function in a particular process involve forward genetics. One way to mutate genes using this process is to expose organisms to a mutagen (typically either a chemical or gamma radiation)‚ randomly mutating the genome in many animals. We then screen these animals for defects in the process we wish to study – essentially‚ looking for physical or behavioral changes in the organism. Mutagenesis (creating mutations) is
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So in the last unit we studied about chemical basis of life. Now just Focus for a moment on biology‘s subject‚ ‗life‘. All living things on earth are characterized by cellular organization‚ growth‚ reproduction‚ homeostasis and heredity. These characteristics define the term life. Then what is inheritance? Inheritance is something you possess from your ancestor and carried along‚ it may be any asset‚ money or anything but when we connect with the life what we will take from our parental generation
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to the other‚ and heterozygotes exhibit an intermediate phenotype (incomplete dominance). Each dark-skin allele in the genotype adds pigment by increasing melanin production. There are seven different shades of skin color ranging from very light (aabbcc) to very dark (AABBC); most individuals have the intermediate skin color (AaBbCc). A cross between two individuals with intermediate skin color produces offspring with a range of phenotypes (bell-shaped curve). According to the article‚ some suggest
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hypomaturation General Information • • • • • • • • • Absence of systemic disorder Can be part of a syndrome Many types Different modes of inheritance Different phenotypes in a single family Same phenotype with different gene mutations Homozygotes differ from heterozygotes 1:800 – 1:15‚000 (clustering) Both dentitions Genes and Phenotypes • AMELX (amelogenin) – X-linked – Diffuse smooth hypoplastic and hypomaturation Hypoplastic type • • • • Inadequate deposition of organic matrix Normal mineralization
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What determines how a child develops? In reality‚ it would be impossible to account for each and every influence that ultimately determines who a child becomes. What we can look at are some of the most apparent influences such as genetics‚ parenting‚ experiences‚ friends‚ family relationships and school to help us understand the influences that help contribute to a child’s growth. Think of these influences as building blocks. While most people tend to have the same basic building blocks‚ these
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IB204 Mock exam 1 1) Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair‚ what fraction of their offspring would be expected to have straight hair? A) 1/2 straight B) 1/4 curly C) 100% straight D) 3/4 curly E) It is impossible to predict the outcome. 2) Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring. When the albino was crossed with a second black one‚ 4
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HSC BIOLOGY TOPIC 2: BLUEPRINT OF LIFE HSC BIOLOGY TOPIC 2: BLUEPRINT OF LIFE 1) Evidence of evolution suggests that the mechanisms of inheritance‚ accompanied by selection‚ allow change over many generations. 1.1.1 Outline the impact of evolution of plants and animals of: * Changes in physical conditions in the environment * Changes in chemical conditions in the environment * Competition for resources
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Unit 2. Chapters 9-16. Cell Processes 1. Cellular Respiration‚ Photosynthesis‚ Cell Cycle‚ Mitosis‚ Meiosis‚ & Genetics. Note A: All work must be hand-written‚ including charts & diagrams. Note B: each answer requires more than one sentence & use diagrams whenever possible; failure to use diagrams will result in less points. Chapter 9 Outline 1) Principles of Energy Conservation a) Cellular respiration and fermentation are catabolic(energy – yielding) pathways b) Cells must recycle the ATP
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