What is a chromosomal disorder What does trisomy

What is a chromosomal disorder? • What does trisomy mean? • What is nondisjunction and when can it occur? • What is Kleinfelters? Turners? What sperm and eggs have to combine for these disorders to occur?

WHY DO YOU LOOK THE WAY YOU DO? ? ? We are going to take a survey for some specific traits… • Please mark whether which characteristic you have Do you have a chin with a cleft? Or a chin without a cleft? This is a chin with a Cleft.

Do you have a widows peak? • Widows peak How about an 80’s cut and crazy swoop bangs…. . Just kidding.

Do you have mid-digit hair? • That’s right, hair on your hand between the two digits. I do!

Do you have attached ear lobes? Unattached Attached

Do you have a hitchhikers thumb? hitchhikers Nonhitchhiker

Can you roll your tongue?

Are you ready to smell something gross? • Is your second toe longer than your big toe? What kind of weirdo takes a picture of their toes and puts it on the inter-net?

• Do you have Dimples like Miss Hollingworth? Divits in your cheeks? • When you cross your arms which do you put on top?

Our Traits Presence of Traits in Miss H’s Class

Do You see any patterns? • What is the relationship between percentages of various traits? • Are the traits distributed equally in our class?

Why do you look the way you do? • You appearance is determined by the genes you have inherited from your mother and father. • There are different types of these genes which are called alleles. • For example there are different alleles for Ear shape – Ex attached, unattached • The physical appearance of each trait is called the phenotype.

More on alleles. . • The specific alleles of a specific trait are the genotype – The dominant allele is written as a capital letter – The recessive allele is written as a lower case letter • If an allele is Dominant it will “cover up the other allele • Thus if the genotype is TT or Tt the dominant trait will show. If tt is the geotype the recessive trait is shown.

Your job is to determine if a specific trait is recessive or dominant • Recessive traits show up 25% of the population • Dominant traits show up in 75% of t he population

You job is to design an experiment to determine if a trait is recessive or dominant. • Choices of traits – Freckles or No Freckles – Broad Lips or thin lips – Left or right handed – Crossing Legs (Left over right or Right over left) – Bent pinkies or straight pinkies

You will create your own • Purpose • Procedure (Must be approved before you run your experiment – Materials and Steps Data • Data Analysis • Conclusion