Biology EOC Review Units 7-15
Transcript of Biology EOC Review Units 7-15
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Biology Review
Units 7 - 15
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ASEXUAL VS SEXUAL REPRODUCTIONASEXUAL REPRODUCTION
SEXUAL REPRODUCTION
Creates identical copies (clones)Only involves MITOSISONE parent involvedCommon in bacteria and unicellular protists
Adds genetic variationInvolves meiosis and fertilizationTWO parents involvedDiploid and haploid cells
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MITOSIS AND MEIOSISMITOSIS
MEIOSIS
One division2n → 2n
(same number of chromosomes)
Results in 2 genetically identical cells
Two divisions2n → n
Half the number of chromosomes
Results in 4 DIFFERENT haploid cellsForms gametes (egg and sperm)
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DNA DNA is a polymer of nucleotides.
A nucleotide is made up of three parts: a sugar, a phosphate and one of four basesIn DNA, the bases are A, T, C, and G
DNA’s shape is a double helixThe two strands are held together by HYDROGEN bondsA binds to TC binds with G
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DNA REPLICATION Process of DNA copying itself Steps
DNA Unzips (Hydrogen bonds break)Each side acts as a templateNew DNA nucleotides are added according to base-pairing rulesTwo new molecules of DNA result – each with one old and one new
strand. Happens in INTERPHASE (before mitosis or meiosis)
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PROTEIN SYNTHESIS Remember, genes are made of DNA and are in the nucleus Genes (DNA) contain the instruction for making a protein In transcription, DNA is used to make mRNA in the nucleus mRNA then leaves the nucleus and goes to the ribosome In translation, tRNA then brings amino acids in the proper order to make the
protein on the ribosome.
DNA → mRNA → protein
Made of amino acids
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PROTEIN SYNTHESIS
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CAN YOU IDENTIFY THE PARTS?1. DNA2. mRNA3. Nucleus4. Cytoplasm5. Ribosome6. Codon7. Anticodon8. tRNA9. Amino acid10.Protein
(polypeptide)
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READING THE CODON CHART Be sure to use
mRNA You won’t have
to memorize this!
What amino acid is coded for by the DNA
ATA GAGFirst convert DNA to mRNAATA GAGUAU CUC
UAU = tyrCUC = Leu
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GENETICS We have two genes for each trait
– this is our GENOTYPE One gene came from mom, one
from dad If the genes are alike, the
individual is homozygous (RR, rr)
If the genes are different , they are heterozygous (Rr)
Some genes are dominant and others are recessive
We only show a recessive trait if we have no dominant gene
RR and Rr would “look” dominant
rr would look recessive
This diagram shows the cross between 2 heterozygous purple flowers
Cross is: Bb x Bb Notice that 75% are purple and 25%
white
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SEX LINKAGE Females are XX Males are XY Sex-linked traits
are on X chromosome
Trait is more common in MALES
Examples are colorblindness and hemophilia (blood fails to clot)
• Males give X chromosomes to their daughters and Y’s to their sons
• Moms give X’s to both daughters and sons
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CODOMINANCE – BLOOD TYPE Four blood types▪A, B, AB, O
Three different alleles: A, B or neither
A = AA or AOB = BB or BOAB = ABO = OO
Agglutinogen = protein
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PEDIGREESTracing traits through
generations Males are squares Females are circles Horizontal line means married Vertical line means children Filled in circle means the
individual HAS the condition Can you identify the
genotypes of individuals 4, 7, 12?
4 = Ee (parent 2 had to give an e)7 = Ee (child is ee, so they had to have one e)12 = ee (affected with recessive condition)
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A chart s
howing
arrangement o
f
chromosomes
KARYOTYPE
In humans, 22 pair of autosomes1 pair of sex chromosomesXX = femaleXY = maleExtra chromosomes a result of
non-disjunctionChromosome pairs fail to separate in meiosisOne example is DOWN SYNDROME (extra 21)Another example is KLINEFELTERS (XXY)
XY = male
3 21’s = Down Syndrome
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GENETIC TECHNOLOGY
TRANSGENIC ORGANISMS
DNA FINGERPRINTING
Organisms that have 2 different kinds of DNAGene cloningUses bacteria to make human proteins like insulin
Use gel electrophoresis to compare DNA fragmentsIF DNA matches, it’s from the same individual
Evidence points to suspect 2
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EVOLUTION – CHANGE OVER TIMEEVIDENCE NATURAL SELECTION
Fossil evidenceFossils found in sedimentary rockLower level fossils are older and
more PRIMITIVEWe can compare fossils to modern
organismsSimilar structure suggests common
ancestorBiochemical evidence
DNA and protein similarities suggest common ancestor
Credited to Charles DarwinOrganisms in populations have
variations that can be passed from generation to generation
More organisms born that environment can support
Organisms compete for resourcesThose organisms with favorable
variations have more babies and the population evolves
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CLADOGRAMS
DETERMINING EVOLUTIONARY RELATIONSHIPS
Which type of plant is most closely related to flowering plants?
CONIFERS
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HISTORY OF CLASSIFICATION SYSTEMS
o Aristotle – Plants and Animals o Linneaus – developed BINOMIAL
NOMENCLATUREo TWO KINGDOMS: plants and animalso THREE kingdoms: plant, animal,
Protisto FIVE kingdoms: plant, animal,
Protist, fungi, Moneran
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CLASSIFICATION
Scientific name is genus and species name. Organisms in same genus are closely related
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FIVE KINGDOM CLASSIFICATION
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DICHOTOMOUS KEY• Always begin with #1• Follow directions using choices given• What shape is “Gina”?• Equilateral triangle
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TYPES OF PLANTS
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PLANT ADAPTATIONSROOT, STEM, LEAF
FLOWERS AND FRUITSRoots are adapted to absorb water with root hairsLeaves are adapted for photosynthesis by being flat and greenStems move water with xylem
Flowers have bright petals to attract pollinatorsPollen (Sperm) can be transferred by animalsWhen egg joins with pollen, a seed is formed in the ovaryThe ovary becomes the fruitFruit surrounds and protects seedFruit also helps get baby plants in seeds away from parent plant
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TYPES OF ANIMALS
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DISEASE CAUSING VIRUSESVIRUS STRUCTURE
VIRAL REPRODUCTION
A virus is not made of cellsIt is nucleic acid (DNA or RNA) surrounded by protein coat (Capsid)
Virus can’t reproduce unless it is inside a living cellThe virus uses the cells enzymes and ribosomes to make DNA and proteinNew viruses either bud off of the cell or the cell bursts, releasing lots of viruses
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BACTERIA VS VIRUSESBACTERIA VIRUS
Made of cellsCan be killed by antibioticsExamples of disease caused by bacteria is strep throat
Not made of cellsMUCH SMALLER THAN CELLSCan’t be killed by antibioticsExample of diseases caused by viruses are AIDS (HIV), Smallpox, Influenza
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INTERNAL AND EXTERNAL FACTORS IN DISEASE
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IMMUNITY
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PASSIVE VS. ACTIVE IMMUNITYPASSIVE IMMUNITY
ACTIVE IMMUNITY
Person does NOT make memory cells or antibodiesAntibodies only are transferredDoesn’t provide long-term protectionNatural: from breastfeedingArtificial: Rabies “shot”
Person DOES make antibodies AND memory cellsProvides long term immunityNatural: you have diseaseArtificial – you get a VACCINATION
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BEHAVIORAL ADAPTATIONS
BEHAVIOR IS ANY THING AN ANIMAL DOES. ANIMAL BEHAVIORS ALSO HELP ANIMALS
SURVIVE AND/OR REPRODUCE.
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Innate Behavior
o Innate behavior is also called inborn behavior.
o It is programmed in DNAo Innate behaviors include
reflexes and instinctso Exampleso human suckling.o spiders spinning webso Migration: birds flying south for
the wintero Hibernation – dormant when
coldo Estivation – dormant when hot
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LEARNED BEHAVIOR
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SOCIAL BEHAVIOR
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CARBON CYCLE Cycling of carbon and oxygen Three main processes
Photosynthesis – plants use carbon dioxide; produce oxygenRespiration – uses oxygen, produces carbon dioxide (both plants and animals)Combustion – burning – releases more carbon dioxide
Greenhouse Effect•Carbon dioxide traps heat in the atmosphere, making life possible•Increased carbon dioxide can make temperatures rise more•Human activities can lead to GLOBAL WARMING
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BE A GOOD STEWARD