Biology January 31st

Get out your annotated Blue People article!

Reminders:DNA Genetics Internet Activity

due tomorrow!!

Blue People of Troublesome CreekComplete the following tasks with your

group:Create a list of the words you do NOT

knowShade the circles and squares of the

people who are blue in the pedigreeAnswer the following questions:

◦What made some members of the Fugate family blue?

◦Who diagnosed the disorder?◦Why did the Fugates marry into their own

family? ◦What two industries brought progress to

KY?

Question of the Day!

Why don’t you look like the person sitting next to you? (be specific!)

Why do you look like that?

Genetics = Study of Heredity

Passing of genes, or traits, from parent to

offspring

GenesSegments of DNA on

chromosomes that determine specific traits

Two forms of every gene!◦Called alleles◦Represented by capitol or lowercase

letters Ex: H or h (same letter, different form)

◦Alleles make up your genotype◦Genes determine your physical

appearance!

TraitsInherited Characteristics

Observable Traits = Phenotype

Physical Characteristic

sEx: Hair color, eye color, freckles, dimples, right-handed

Traits ContinuedDominant Trait = will always be

seen when a copy of the allele is present◦Represented by capitol letter◦Ex: Right-handed (H)

Recessive Trait = hidden when the dominant allele is present◦Represented by lower case letter◦Ex: Left-Handed (h)

GenotypeThe genes that are present in an

individual ◦Represented by 2 letters!

Homozygous: 2 of the same alleles or genes◦Homozygous dominant: 2 dominant alleles

Ex: HH

◦Homozygous Recessive: 2 recessive alleles Ex: hh

Heterozygous: 2 alleles that are opposite◦One dominant and one recessive

Ex: Hh

Happy Friday!!Turn in your DNA Genetics

Internet ActivityGet out your Genetics Practice

Problems from Thursday, as well as your notes

Genetics Quiz TUESDAY!!

Practice #1

AA ___________Bb ___________Cc ___________DD ___________

Practice #2

Green peas are dominant to yellow peas

GG _____________Gg _____________gg _____________

Practice #3

Straight hair is dominant to curly.

_________ Straight_________ straight

(heterozygous) _________ curly

Gregor MendelAustrian Monk who studied

genetics in pea plants

Punnett SquaresUsed to predict the traits of

offspringMom’s

genotype

Dad’s

genoty

pe

Possi

ble Offsp

ring

genotypes

Mendel’s ExperimentParent Generation: TT x tt

(tall) (short)

T = tall pea

plantt = short pea

plant

Mendel’s ExperimentFirst Generation: Tt x Tt

(tall) (tall)

T = tall pea

plantt = short pea

plant

More Practice

Use the punnett square on #2 to answer the following question:If you crossed a heterozygous short haired guinea pig with a long haired guinea pig, what percentage of the offspring would have long hair?

In hobbits, hairy toes (H) are dominant to smooth toes(h).

Cross a homozygous hairy toed hobbit with a heterozygous

hairy toed hobbit.

In pea plants, purple flowers (P) are dominant to white

flowers(p). Cross 2 homozygous purple flower plants.

In guinea pigs, brown hair (B) is dominant to spotted hair (b). Cross 2 heterozygous

brown guinea pigs.

Widow’s peak (W) is dominant to a smooth hairline (w). Cross a woman who is homozygous for widow’s peak with her husband,

who has a smooth hairline.

In Rasatafarians, dreadlocks are dominant to baldness. Cross a female who’ s bald with her husband, who is homozygous for dreads.