Mendel, Mendel extended, DNA/RNA and biotechnology
Coopercityhigh.net/webpages/lcoyne

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Law of Segregation- member of each pair of alleles separate when gametes are formed. A gamete will receive one allele or the other.
(anaphase I)
Law of Independent Assortment- pairs of alleles line up independently of one another during gamete formation (metaphase I)

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Mutations
Crossing over in prophase I
Independent assortment in metaphase I
Sexual recombination
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Variations in DNA can cause variations in organisms phenotype. This can result in the evolution of the species as traits are selected for and against

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Homozygous dominant- GG
Heterozygous- Gg
Homozygous recessive- gg
Genotype- GG, Gg, gg
Phenotype- green, yellow
Allele- alternate forms of a gene
Punnett square- used to determine probability of a trait being passed to offspring
P= parents, F
1
= 1 st generation of kids,
F
2
= 2 nd generation of kids
Meiosis→Fertilization→Cleavage→Differentiation

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Two plants are crossed, the first is heterozygous for height and has yellow seeds. The second is heterozygous for height and seed color. (Tall dominant over short, Green dominant over yellow)
Genotype of parents Ttgg X TtGg
Create two monohybrid cross (TtX Tt and ggXGg)
Multiply the fraction possibilities to get your answer

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A. 0
B. 6
C. 9
D. 12
Answer C

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A. Both parent plants are heterozygous for flower color.
B. Both parent plants were homozygous for purple flowers.
C. One plant had white flowers and the other was heterozygous.
D. One parent was heterozygous for flower color and the other was homozygous with purple flowers.
Answer A

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Incomplete dominance- neither trait is dominant
(red and white flowers make pink)
Codominance -(both are dominant) blood type
Sex linked- trait is found on the X chromsome
(males more likely to have these because they only have one X chromsome)
Polygenic- several genes code for a trait (height)
Multiple Alleles- 3 or more possible alleles for a trait (blood type/A,B,O)
Barr body- one X chromsome is shut down in each female diploid cell

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Autosomal- found on chromosomes #1-22, individuals need 2 recessive alleles to have disease
◦ Huntington’s unusual because caused by dominant allele
Sex linked- found on X chromosomes and males are more likely to have disease because they only have one X chromosome
Nondisjunction- chromosomes don’t separate properly during Anaphase resulting in an extra chromsome in gamete (down syndrome)

Autosomes (#1-22) sex chromosomes #23

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The allele for brown eyes is dominant to blue eyes. Which best explains how two brown eyed parents have a blue eyed child?
A. Each parent is carrying a recessive allele for the trait.
B. Eye color is a sex linked trait and male children could have only the allele for blue eyes.
C. Mutations after fertilization could alter gene sequences and change alleles.
D. One parent must have had only blue eyed parents.
Answer A

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Griffith proved transformation- bacteria pick of DNA from environment (mice experiment)

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purines = adenine and guanine pyrimidines = cytosine and thymine phosphate group nitrogen-containing base deoxyribose (sugar)

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Adenine- Thymine (uracil if RNA)
Cytosine- Guanine

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DNA Replication- process by which DNA makes a copy of itself in order to produce two identical cells
1. DNA is uncoiled with enzymes
2. DNA polymerase- enzyme which then bonds the complementary nucleotides together
3. Each new DNA molecule has one original and one new strand
(semiconservative model)

new strand nucleotide
DNA polymerase

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All organisms use the same 4 bases (ATCG)
It is the difference in order and arrangement which results in the variety of life on earth
This demonstrates an evolutionary relationship between organisms
The more shared DNA in the same order, the more closely related two species are

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RNA- nucleic acid which acts as a messenger between DNA and the ribosomes for protein synthesis
Central Dogma- information flows from
DNA to RNA

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Structure- single stranded
5-Carbon sugar (ribose) phosphate group nitrogenous base
◦ purines- adenine and guanine
◦ pyrimidines- cytosine and uracil

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Transcription- process by which information is transferred from DNA to RNA in sets of three nucleotides (codon)
◦ Introns are cut out and stay in nucleus, exons leave
◦ messenger RNA (mRNA)- copies and carries information out of nucleus to ribosome
Translation- decoding of mRNA in order to form proteins (assisted by transfer RNAtRNA and ribosomal RNA - rRNA)
◦ tRNA reads in sets of 3 called the anticodon
◦ Amino acids are linked by peptide bonds to make protein

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A. Only tRNA bends into specific shapes to make amino acids.
B. Only mRNA can repair specific mistakes in
DNA code.
C. The tRNA is used on the ribosomes and the mRNA is used in the nucleus.
D. The mRNA brings information to the nucleus for the tRNA to use.
Answer A

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Random changes to DNA
Point mutation- one nucleotide is substituted
Frameshift mutation- insertion or deletion of a base resulting in a shift as to how the codon is read
Mutagens- agents which can change the DNA
(UV light, industrial chemicals etc.)

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A. 5
B. 4
C. 2
D. 3
Answer D

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A. Cells having the new DNA version will look or operate differently from cells with the original DNA.
Only the sections of DNA without mistakes will be used in the future so the DNA strand will shorten.
C. The DNA will be exactly like the original since only the original strand of DNA is used as a template.
D. When the new strand is used as a template the strand built from it will differ from the original DNA.
Answer D

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Cut desired gene and plasmid of bacteria with same restriction enzyme
Combine desired gene and plasmid together
Insert recombinant plasmid into a bacteria and allow to reproduce
Evidence that it worked- bacteria shows trait
(glows, produces chemical etc)

Gel Electrophoresis
DNA moves towards positive side
The more bands that line up, the more closely related

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Transgenic organisms- contain DNA from a different species
Production of medicine like insulin, make plants resistant to disease, pests, etc…, make livestock produce more meat, milk…, test out treatments for human diseases on other organisms

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A. Nucleic acids are used as the building blocks of proteins, while enzymes are used as the building blocks of phospholipids.
B. Nucleic acids contain the genetic code for protein synthesis, while enzymes catalyze chemical reactions
C. Nucleic acids inhibit biochemical reactions, while enzymes catalyze reactions
D. Nucleic acids transmit signals that begin biological processes, enzymes convert carbohydrates into lipids and proteins.
Answer C