1/15 & 1/16 - 7th Grade Agenda

Learning Objective: Human TraitsCollect HW Genetic Activities Worksheet 1st Semester Final ExamVideo: Test Your BrainText Book Reading: 192 – 198HW: Reading & Notetaking p. 101 – 104HW: Science Fair Background due 1/17 & 1/18 (10 Points) Last day to turn in late work for the semester: 1/22 & 1/23

Last Day to Turn in Latework for this Semester 1/22 & 1/23

Reflection

• Prompt: Write 2 differences between DNA and RNA

DNA vs RNA

• Master Copy• Two Strands• Never leave

nucleus

• Copy• One Strand• Leaves the

nucleus

DNA RNA

Step 1 in Protein Synthesis

• Messenger RNA Production

Step 2 in Protein Synthesis

• Messenger RNA attaches to a Ribosome

Step 3 in Protein Synthesis

• Transfer RNA attaches to a Messenger RNA

Step 4 in Protein Synthesis

• Protein Grows

Mutation

Mutation

• Mutation means “cha_____” in Latin

• Mutation can cause a cell to produce an incorrect pro____ during protein synthesis.

• As a result, the organism’s trait, or pheno____, may be different from what it normally would have been.

nge

tein

type

Hybrid Animals

Horse Donkey

Mule

• All male and most female mules are infertile

• More intelligent than a donkey

• More endurance than a horse

• Requires less food than a horse

Ligers = Male Lion + Female Tiger

More Ligers

Tigon = Male Tiger + Female Lion

Zorse = Male Zebra + Female Horse

Wholphin = Dolphin + False Killer Whale

Wholphin

False Killer Whale

Dolphin

Wolfdog = Wolf + dog

House Cat + African Cat

African Cat

Tangelo = Tangerine + Grape Fruit

Some human traits are controlled by a single gene that

has more than two alleles

• Blood type is controlled by three Alleles

• What are the major human blood types?

• A, B, AB & O• Which human blood type

is a universal donor?• Blood Type: O

Many human traits are controlled by many genes

• Four genes control height in humans• Skin, eye and hair color are controlled by

multiple genes

What are the Female Sex Chromosomes?

• XX

What are the Male Sex Chromosomes?

• XY• Because there is

some missing genetic information in the “Y” chromosomes, Males are more likely to get a sex-linked trait

Who determines whether the child is a boy or a girl ?

• Father

How many pairs of chromosomes do humans have?• 23