January 11, 2017 Objective: I can explain how traits are observable characteristics that are passed down from parent to child. Launch: AN INVENTORY OF TRAITS - SURVEY Define following terms: GENE, HEREDITY, INHERITANCE Homework: Work on your midterm review packet and bring your review books to class.

January 12, 2017 Objective: I can explain how traits are observable characteristics that are passed down from parent to child. Launch: AN INVENTORY OF TRAITS - SURVEY Back of the launch practice review questions Homework: Work on your midterm review packet and bring your review books to class.

AN INVENTORY OF TRAITS - SURVEY

Brain pop: Heredity

GENETIC TRAITS Which ones do YOU have?

Genes from Mom & Dad Determine Your Traits You are a diploid (2n) organism, meaning that you received one set of genes from your father and the other set of genes from your mother. The combination of these pairs of genes that you've inherited is called your "genotype." The expression of these inherited genes is called your “phenotype” (what we actually see).

What is heredity? Heredity is the passage of coded instructions from one generation of a species to the next. This coded set of instructions ensures the accurate transfer of information from parent to offspring.

Which traits did you inherit from your mother; from your father? Take this simple genetic quiz and learn about the genes that you possess.

Class Lab Activity An inventory of my traits- survey

Attached ear lobe/free hanging

Earlobe Attachment Some people have their ear lobes attached to the side of the head and some people have free ear lobes. This is due to a gene that is dominant for unattached ear lobes and recessive in case of attached ear lobes.

Tongue roll

Even a dog can do it!!

Freak tongue roll

Rolling of Tongue If you can roll the lateral edges of your tongue together, then this means you have inherited a dominant trait. Those who are unable to do so are expressing inheritance of recessive gene for tongue rolling.

Dimples

Dimples People all over the world with dimples are expressing the dominant gene for dimples. Whereas, people without dimples have recessive genes.

Freckles

Freckles

CLEFT CHIN

CLEFT CHIN

Straight hair line

Widow’s Peak A widow's peak or the mid-digital hairline is due to expression of the gene for hairline. This gene has two alleles, one for widow's peak and one for straight hairline. The widow's peak allele is dominant and the straight allele is recessive. When two widow's peak alleles are present, the individual will have a peak. Then one widow's peak and one straight allele is present, it will give rise to expression of a peak. However, when there are two recessive genes, that is, straight hairline alleles, the expression of the trait is a straight hairline.

Widow’s peak

Widow’s peak

Crooked Pinky

You can try to bend your pinkie finger inwards towards your ring finger or fourth finger. If you are able to do so, it means you have inherited the dominant version of the gene that causes the distal segment of the pinkie to bend.

An x-ray of crooked pinky

You can see the crooked pinky on a baby too…

Hitchhikers thumb

Hair on Mid-digit of Fingers

Put your hands together… which thumb is on top?

Crossing of Thumbs You need to observe the position of your thumbs in a relaxed interlocking of fingers. Do you find your left thumb crossing your right thumb? If yes, then you probably have inherited 1 or 2 copies of the dominate gene. In case of 2 recessive genes inherited, you will find your right thumb placed over your left thumb.

Polydactylism

Is your 2nd toe longer than your first?

Vulcan- Can you do this?

PTC paper(Phenylthiocarbamide)

Video clip Couple gives birth to twins, one black, one white. https://www.youtube.com/watch?v=-e5ODsf_TEk