1/24 & 1/25 - 7th Grade Agenda Learning Objective: Human Traits Collect HW Genetic Activities Worksheet Collect Late Science Fair Background 2nd Semester Pretest Class Work: Scientific Method Worksheet Video: BBC (Challenges of Life) Text Book Reading: 192 – 198 HW: Reading & Notetaking p. 101 – 104 Reminder: Science Fair Procedures, Data Table & Results due 2/9 & 2/10 (15 Points)

Last Day to Turn in Latework for this Semester 1/24 & 1/25

Reflection Prompt: Write 2 differences between DNA and RNA

DNA vs RNA DNA RNA Copy One Strand Leaves the nucleus Master Copy Two Strands Never leave nucleus Copy One Strand Leaves the nucleus

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 nge tein type 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

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