1/20 & 1/21 - 7th Grade Agenda

Collect HW: Reading & Notetaking p. 101 – 104 & Signed Grade PrintoutLast Day to turn in late work for the SemesterLate Science Faire Background PresentationsGenetic Traits ActivityHuman TraitsMicro Viewer Lab (Central Nervous System)Video: BBC (Challenges of Life)Text Book Reading: 199 – 203HW: Reading & Notetaking p. 105 - 108Reminder Procedure, Data Table, Graph & Results due 2/9 & 2/10 (15 Points)

Reflection

• Prompt: Write 2 differences between DNA and RNA

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.

gstines

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

Reflection

• Prompt: Write 3 facts you learned from the video