synaptic vesicles to release their neurotransmitters‚ there would be no movement in the cell at all. This experiment is so important because vesicle transport in neurons helps to identify many neurological disorders. One such example is a research on Drosophila. Since there is only one kinesin light gene in the subject‚ the mutants in that one chain gene exhibit severe motor neuronal disease (Hirokawa‚ 2008). The disruption of the anterograde and retrograde transport of membrane vesicles was found to interrupt
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evolutionary relatives by several semi-aquatic adaptations: a relatively hairless appearance in comparison to the great apes‚ a hooded nose and muscular nostril aperture control to prevent water from entering the lungs‚ extensive sebaceous glands‚ vestigial webbing between fingers‚ and the waxy coating found on newborns. The aquatic ape hypothesis has received little attention from mainstream paleoanthropologists as it lacks evidence from fossil records to support its
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and are usually smaller than the female flies. The females have pointed posteriors‚ do not have sex combs‚ and are usually larger. Once the flies are sorted‚ one must make two to three culture vials for the flies to cross in. Place one cup of Drosophila medium and one cup of water in each vial. Label each vial the date and what one is crossing. Then put five to six
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Experiment 1 Salivary Gland Chromosome Preparation Introduction: Microscopic‚ threadlike part of the cell and a structured DNA which carries hereditary information in the form of genes is a chromosome. Endomitosis is mitosis without nuclear or cellular division. This produces many copies of the same chromosome in a single nucleus (Kim 2004). For this experiment‚ I hypothesize that D. melanogaster undergoes endomitosis meaning without cellular mitotic division. If it undergoes endomitosis‚ then
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when crossed with a heterozygote (Yy) will give some offspring that are green 4- To determine whether an animal with the dominant phenotype is heterozygous or homozygous‚ it is best to cross it with the SAME phenotype. 5- If you performed the Drosophila cross LL × ll‚ what phenotypic ratio would you expect among the offspring? 3:1 6- According to Mendel’s law of independent assortment‚ how many different types of gametes would an AaBb parent have? An AABb parent? AaBb: AB‚ Ab‚ aB‚ ab (4) AABb:
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that Revolutionized biological science? Charles Darwin He read Mauthes’s work‚ and that’s what made it click. LaMark‚ says that blacksmith’s kids will have bigger arms because their parents have big arms. Whales pelvis’s are an example of vestigial structure. Darwin couldn’t explain 2 things thru his explanation of natural selection: trait inheritance & variation. Darwin’s theory for this was Pangenesis Father or geology – Charles Lyell Only 33% of Americans believe in evolution
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within DNA consist of genes that make proteins to determine our development Genome is the set of complete instructions for making an organism‚ containing all the genes in that organism. Thus‚ the human genome makes us human‚ and the genome for drosophila makes it a common housefly. Studying the effects of heredity and environment on two sets of twins‚ identical (monozygotic) and fraternal (dizygotic)‚ has come in handy. A number of studies compared identical twins reared separately from birth
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Ion tropic receptors are ligand-activated ion channels that permit entry of ions when the central pore is open. According to Hofmeyer (2009)‚ receptor protein tyrosine phosphatases control many aspects of nervous system development. At the Drosophila neuromuscular junction‚ regulation of synapse growth and maturation by the RPTP LAR depends on catalytic phosphatase activity and on the extracellular ligands syndecan and
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species. b. the origin of a new species from an ancestral form. c. an extinct species. d. a common ancestor of a group of modern species. 6. In studying a species of fish‚ a structure is discovered that has no apparent function. If this is a vestigial structure‚ what would you find in at least some relatives of this fish? a. The structure should be absent. b. The structure should be present and also have no function. c. A similar structure should be present‚ but it would be larger and have
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existed. However‚ biologists have now established that there are giant constrictors in the Everglades and are working to remove them in a humane way. Pythons and boas‚ classified as Boids‚ are comparatively large‚ non-venomous animals with a vestigial pelvic girdle. There are no native
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