_____________Deoxyribo-Nucleic Acid

DNA makes up genes that determines the ______ of all living things….such as:

traits

Eye color, skin color, texture, freckles, hair color, style…etc

Makes up _____________

Controls ____________

Forms _______________________

Found in the __________ of all cells

GENES

TRAITS

CHROMOSOMES

NUCLEUS

A ladder

twisted

Double helix

The code is found in the

“________” of the ladder.

Each rung is a combination of ______ ________________ bonded together.

The Nitrogen bases are:

C = CYTOSINE

G = GUANINE

T = THYMINE

A = ADENINE

RUNGS

2 nitrogen bases

“A” bonds ONLY with “___”

“C” bonds ONLY with “___”

A

TC G

T A

A

C

T

GG C

C

T A

GThis goes on for the entire length of the DNA molecule, which consists of __________ of nitrogen bases.

T

G

billions

The ____________________ in DNA will determine what the trait is.

“O W L” means

If you change the letters to

“L O W”

it no longer means…

However…

For example: Lets take a look at the letters of the alphabet…

sequence of letters

“A predatory bird”

“A predatory bird”

Since DNA consists of billions of nitrogen bases, the amount of variation among organisms is HUGE. If you change only one letter, the entire code will be changed, and therefore the organism will be different!!

DNA is composed of four types of nucleotides.

• DNA is made up of a long chain of nucleotides.• Each nucleotide has three parts.

1) a phosphate group2) a deoxyribose sugar3) a nitrogen-containing base

phosphate group

deoxyribose (sugar)

nitrogen-containingbase

• The nitrogen containing bases are the only difference in the four nucleotides.

TA

CG

Nucleotides always pair in the same way.

• The base-pairing rules show how nucleotides always pair up in DNA.

• Because a pyrimidine (single ring) pairs with a purine (double ring), the helix has a uniform width.

– A pairs with T

– C pairs with G

•DNA makes up a _______________.

•Chromosomes are found in the nucleus of every cell in the body!!

chromosome

A gene is a

________________________that codes for a __________________.

There are about __________ genes in an entire DNA molecule

geneSmall piece

Of DNA

specific

trait

30,000

(Physical trait)

ribosomenucleus

RNA is a “__________” molecule. It helps carry the DNA code to the __________ so it can make the protein.

Skin color/texture

Eye color/shape

Height

Bone density

Hair texture

Etc…

DNA contains the code for what protein will be made by the cell

helper

ribosome

1. What does DNA mean? _____________________________________

2. Suppose one side of a DNA molecule had the bases

A-A-G-T-C- G- A-T-G-G-C-A-C-C. What would the other side of the DNA look like? ____________________________________________

3. What is the function of RNA? _____________________________

4. What is a mutation? ______________________________________

5. What term best describes what a DNA looks like? _________________

6. Explain the relationship between DNA, chromosomes, and genes?

__________________________________________________________

7. If everyone consists of only 4 nitrogen bases (A-T-C-G), why are no two people alike? __________________________________

8. How many chromosomes does a human have? ___________

9. How many genes does a human have? ___________

10. Therefore, approximately how many genes are on a single chromosome? ______

11. If 24% of a DNA molecule is Adenine, what percent would be…

Thymine = ____% Guanine= _____% Cytosine= _____%

Deoxyribo-nucleic acid

T- T- C- A- G-C--T- A- C- C- G-T- G-Gcarry the DNA code to the ribosome

A random change in the DNA code

Double helix

A chromosomes is made up of DNA, which is consists of about 30,000 genes

bc it’s the sequence of nitogen bases that makes us different46

About 30,000

~ 650

24 26 26

If there is 37% of Adenine in a DNA molecule…

How much Thymine? ___________How much Cytosine? ___________How much Guanine? ___________

If there is 23% of Guanine in a DNA molecule…

How much Thymine? ___________How much Cytosine? ___________How much Adenine? ___________

If there is 18% of Cytosine in a DNA molecule, which is the only possibility for another nitrogen base? (Put an ‘X’ on your answer)

________18% Adenine________64% Adenine________ 32% Guanine________ 32% Thymine

UNDERSTANDING THE COMPONENTS OF DNA

Replication makes an exact copy of a cell’s DNA

• A single strand of DNA serves as a template for a new strand.• The rules of base pairing direct

replication.• DNA is replicated during the

____________stage of thecell cycle.

• Each body cell gets acomplete set ofidentical DNA.

• DNA replication takes place in ___________

Nucleus

S (synthesis)

Proteins carry out the process of replication.

• DNA serves only as a template. • Enzymes and other proteins do the actual work of

replication.– Enzymes unzip the _______________– Free-floating nucleotides form hydrogen bonds with the

template strand. nucleotide

The DNA molecule unzips in both directions.

Double helix

RNA carries DNA’s instructions.

• The central dogma states that information flows in one direction from _____________

• ______________DNA to RNA toprotein

• The central dogma includes three processes.

• RNA is a link between DNA and proteins.

replication

transcription

translation

1) Replication

2) Transcription

3) Translation

• RNA differs from DNA in three major ways.

1)RNA has a ____________________

2)RNA has ___________ instead of thymine.

3)RNA is a __________________________.

Ribose sugar

uracil

single-stranded structure

The transcription process is similar to replication.

• Transcription and replication both involve complex enzymes and complementary base pairing.

• The two processes have different end results.– Replication copies

all the________;transcription copiesa ___________.

– Replication makes_______ copy;transcription canmake ________copies.

growing RNA strands

DNA

onegene

DNA

gene

one

many

•When the sequence of letters is changed. Since the code no longer reads the correct way, the cell does not make the correct protein.

•Consequently, a different trait may appear.

•They are usually _________

Oops!!

bad

Some mutations affect a single gene, while others affect an entire chromosome.

• A mutation is _______________________________.• Many kinds of mutations can occur, especially during

replication.• A point mutation substitutes one nucleotide for another.

mutatedbase

a change in an organism’s DNA

• Many kinds of mutations can occur, especially during replication.

– A frameshift mutation inserts or deletes a nucleotide in the DNA sequence.

• Chromosomal mutations affect many genes.

– Chromosomal mutations affect many genes.– Gene duplication results from unequal crossing over.

• Chromosomal mutations may occur during crossing over

Mutations can be caused by several factors.

• Replication errors can cause mutations.

• Mutagens, such as UV ray and chemicals, can cause mutations.

• Some cancer drugs use mutagenic properties to kill cancer cells.

A MUTATION is any _________________ in copying the DNA message.

CHANGE = WRONG ______________

A wrong base in the DNA gives the cell the wrong __________________.

If a cell has the wrong message, the wrong type of ________________ is made.

If the wrong protein is made, the wrong ________________ may appear.

CHANGE

BASE PAIR

MESSAGE

PROTEIN TRAIT

1. Simple copying mistakes during cell reproduction

1. A mutation causes a change in an offspring’s traits only when it takes place in the ___________________ sex cells.

2. Chemicals

1. _______________

2. _______________

3. Radiation

1. _______________

2. _______________

__________________: Any agent that can cause alterations to DNA

PARENTS

NICOTINE

ASBESTOS

SUN

X-RAY

MUTAGEN

HELPFUL MUTATIONSHARMFUL MUTATIONS

Any trait that interferes with the ______________________

and _________________ of an organism.

Any trait that enhances an organisms ability to______________________

and _________________ in its _____________________.

REPRODUCTION

SURVIVAL

REPRODUCE

SURVIVE ENVIRONMENT

1. The term “clone” refers to organisms having ____________________

Two “clones” are exact _______________ of each other.

Same _______ = Same __________ = Same _________

2. Examples of clones:

a. _________________: form from the splitting of _____ fertilized egg

b. Clone organisms produced in ___________________

IDENTICAL DNA

copies

DNA GENES TRAITS

IDENTICAL TWINS ONE

LABORATORY

Fraternal Twins vs Identical Twins_____________________ eggs are fertilized by_____________________ sperm.

Each egg and sperm carry __________________combinations of ____________.

Therefore, each offspring will ________________genetically.

TWO DIFFERENT

TWO DIFFERENT

DIFFERENTDNA

VARY

10

20

20

20

20

20

10

RemoveUnfertilized

Ovum

Destroy Nucleus

RemoveBody Cells

Insert Nucleus from Dark frog into egg

of Light frog

DNA MOLECULE

_______________(SHAPE)

SIDE PARTS RUNG PARTS

___________ ___________

___________

& ___________

___________ ___________

What is the difference between a cell, nucleus, chromosome, genes, and DNA?

How are they related?

WHAT IS THE DIFFERENCE BETWEEN…

Cell: ________________________________

Nucleus: ________________________________

Chromosome: _________________________________

Gene(s): _____________________________________

DNA: ________________________________________

How are they related? ____________________________________________________________________________