2/29 - 7th Grade Agenda Learning Objective: Learn about Genetic Disorders Collect HW: Reading & Note taking p. 102 – 103 Counselor Presentation Text Book Reading: 195 – 200 HW: Reading & Note taking p. 104 – 106 Reminder HW: Science Fair Project due 3/3 & 3/4 (50 Points)

Reflection Prompt: What are the 4 major blood types for humans? Which blood type is the universal donor blood type? Why?

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 to humans have? 23

Sex Linked Genes Genes on the X and Y chromosomes are called sex linked genes Most of the genes on the X chromosomes are not on the Y chromosomes Since Males have the Y chromosomes they are missing an allele.

Red – Green colorblindness More males have red – green color blindness then females Why?

Red – Green colorblindness

Red – Green colorblindness

Genetic Disorders – Cystic Fibrosis Cystic Fibrosis is a disorder in which the body produces abnormally thick mucus in the lun___ and intes_____. The thick mucus fills the lungs making it hard for the affect person to breathe. gs tines

Genetic Disorders – Sickle Cell Disease Sickle shaped red blood cells clog blood vessels and cannot carry as much ox_____ as normal cells. ygen

Genetic Disorders – Hemophilia People with Hemophilia do not produce one of the prot_____ needed for normal clotting. They can die from simple cuts and bruises ein

Genetic Disorders – Down Syndrome In Down syndrome, a person’s cells have an extra copy of chrom______ 21 People with Down syndrome have some degree of mental retar________ osome dation