New Seating Chart

Semester 2 PreviewGenetics

◦DNA◦Gene expression

and protein synthesis

◦Mutations◦Creation of sex

cells (gametes)◦ Inheritance of traits◦biotechnology

Evolution◦Gene pools◦Sources of variation◦Natural selection◦Evidence for evolution◦Adaptations◦Human impacts on

gene pools

• Classification of life– Kingdom Animalia

• Nervous systems– Kingdom Plantae

• Vascular systems• Plant reproduction

https://www.youtube.com/watch?v=EzEr23XJwFY

https://www.twig-world.com/film/genetic-modification-1063/

So what is a GMO and why are they controversial?

Quick CheckWhere is the DNA in a

eukaryotic cell?

1-4-17 Objective

create a model of a DNA molecule and correctly identify each component

As always…

Key concepts are underlined

Vocab is in green

DNA

Structure

Big Idea # 1 DNA is a type of

nucleic acid made up of repeating units called nucleotides

1 nucleotide

Remember…

Nucleotides are like building blocks

A long chain stacked together makes a DNA molecule

Like 1 nucleotide

Many nucleotides linked together = DNA

Big Idea # 2

Nucleotides are made up of 3 parts

1. sugar called deoxyribose2. phosphate group3. nitrogen base

Deoxyribose

Draw along with me in your notebook

Quick CheckWhat observations can you make about this model of DNA?

The deoxyribose sugar and the phosphate are ALWAYS THE SAME

There are 4 KINDS of nitrogen bases:– Adenine (A)– Guanine (G)– Cytosine (C)– Thymine (T)

but…

Quick Check

In your notebook

Draw an ADENINE NUCLEOTIDE pairing with the one you already drew

Big Idea #3

In DNA:– A always pairs with T – C always pairs with G

A and T form 2 hydrogen bonds between them

C and G form 3 hydrogen bonds between them

Quick CheckWhat observations can you

make about the 4 nitrogen bases in DNA?

Big idea #4

DNA is a double helix

Double - 2 strands Helix - twisted

The 2 strands of DNA are COMPLIMENTARY to each other

For your assignment: Color the sugar deoxyribose BLUE Color the phosphate group PURPLE Color the Adenine RED Color the Thymine YELLOW Color the Cytosine ORANGE Color the Guanine GREEN

Answer the questions on a piece of binder paper and build the molecule

When you are done, bring your molecule to the wall and join it to the others