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Warm Up. Put bug lab on desk to be collected – turn in drawing and chart Write down and answer the following question in your notebook. 1. T = tall t = short A. What are the 2 possible genotypes of a tall person? B. What is the phenotype of a person with a tt genotype?.
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Warm Up Put bug lab on desk to be collected – turn in drawing and chart Write down and answer the following question in your notebook. 1. T = tall t = short A. What are the 2 possible genotypes of a tall person? B. What is the phenotype of a person with a tt genotype?
1. T = tall t = short • What are the 2 possible genotypes of a tall person? > TT or Tt B. What is the phenotype of a person with a tt genotype? Short
Notebook Table of Contents March 11 Punnett Squares 7.L.2.2 Notes March 11 Punnett Squares How does a Punnett Square help determine patterns of heredity?
Vocab Review Dominant Allele - represented using a capital letter. Recessive Allele – represented using a lowercase letter Genotype – combinations of letters Phenotype – physical characteristics you can see
Vocab Review Heterozygous – genotype with one capital and one lowercase letter Homozygous – genotype with 2 capitals or 2 lowercase letters
7.L.2.2 Vocabulary Punnett Square > A diagram that shows how parent’s alleles might combine in offspring • Used to determine the potential genotypes and phenotypes of offspring • Each box = 25% or 1/4
Ratio – two numbers that show the relationship between two amounts * Written as number : number 5:4 Percentage – a ratio that compares a number to 100. ex – 50: 100 = 50% Probability – percentage/chance that something will happen. The probability of having an offspring with brown hair is 75% or there is a 75% chance
How to complete a Punnett Square Male / Father alleles B b Step 1 – draw the 4 square Step 2 – put parent allele’s on the outside of Punnett square. dad – top mom – left side Female / Mom Alleles b b
Male / Father alleles B b Female / Mom Alleles b b Step 3. Distribute parent alleles • Bring dad alleles down • Bring mom alleles across Step 4. Determine ratio and probability/percentage - Look at genotypes inside Bb = 2 bb = 2 Ratio = 2:2 50% chance of brown eyes 50% chance of blue eyes B b b b B b b b
B b B B B b B b B b b b
A homozygous dominant red rose crosses with a homozygous recessive pink rose. What are the possible offspring genotype and phenotypes? 1. Homozygous Dominant Red = RR Homozygous Recessive Pink = rr Genotypes: 4 will be Rr Phenotypes 100% of offspring be red R R Rr Rr Rr Rr r r
Two heterozygous black cats (white cats are recessive) are crossed. • Heterozygous black = Bb Genotypes 25% = BB 50% = Bb 25% = bb Phenotypes 75% = black 25% = white B b BB Bb Bb bb B b
Let’s Practice • Punnett Square Worksheet • Punnett Practice #1 • Complete worksheets on your own • When finished with 1 (both sides) check answers at solution station – do not bring pens or pencils!!
A C B A B C C B D C A C C • Test Corrections • 14 – 21 • If marked wrong or ½, use notes to find correct answer. Write on separate sheet and turn in with test/ • Due Wednesday • Extra Credit • Metaphase • Prophase • Telophase / Cytokinesis • Interphase
Warm Up Put HW on desk (Punnett Square Worksheet) WRITE ALL PARTS OF QUESTION A homozygous dominant white dog crosses with a heterozygous white dog. • What are the possible genotypes? • What are the offspring phenotypes?
A homozygous dominant white dog crosses with a heterozygous white dog. Homozygous Dominant = HH Heterozygous = Hh • Genotypes = 2 HH, 2 Hh • Phenotypes = 100% white H H H HH HH h Hh Hh
Exit Ticket Review A heterozygous male is crossed with a homozygous recessive female (use the letter t) Heterozygous = Tt Homozygous recessive = tt • Genotypes = 2 Tt, 2 tt • Phenotypes = 50% tall, 50% short T t t t Tt tt Tt tt
Homozygous Dominant = 2 capital Heterozygous = 1 capital , 1 lowercase
Heterozygous = 1 capital, 1 lower case Heterozygous = 1 capital, 1 lower case
Homozygous tall = 2 capitals Heterozygous = 1 capital, 1 lowercase
Heterozygous white = 1 capital, 1 lower case Homozygous black = 2 lowercase
Monster Punnett Squares Bikini Bottom Genetics Punnett Square Practice Complete front and back of each sheet Raise hand for answer sheet when finished Heterozygous = different Homozygous = same Dominant = Capital Recessive = Lowercase Pure = homozygous Hybrid = Heterozygous Today’s Agenda
Invent-An-Alien! Possible Phenotypes: S/s: Square head (S) or Round (s) E/e: Three eyes (E) or Five eyes (e) H/h: Horns (H) or No horns (h) G/g: Circle nose (G) or Triangle nose (g) A/a: Two antennae (A) or Three antennae (a) Y/y: Two eyebrows (Y) or Four eyebrows (y) T/t: Sharp teeth (T) or Flat teeth (t) • Use these seven characteristics to invent and draw your alien. • Trade aliens with a partner. • On the back of your partner’s paper, draw two chromosomes, each with seven alleles. Label each chromosome with the alien’s alleles!
Warm Up Put homework packet on desk Complete Punnett Square Practice Handout (both sides) – no talking
Yesterday’s Behavior Test = 2 people got above a 70, no one got an A or B Your behavior hurts your overall grade No more warnings – automatic consequences
A C B A B C C B D C A C C • Green Grade = test grade • Blue = Class Grade • Test Corrections • 14 – 21 • If marked wrong or ½, use notes to find correct answer. Write on separate sheet and turn in with test/ • Due Thursday Extra Credit Metaphase Prophase Telophase / Cytokinesis Interphase
Warm Up Put HW packet on desk Write & Answer following question in your notebook A homozygous recessive frog with spots is crossed with a heterozygous female with no spots. What is the probability of their offspring having spots?Create a Punnett square to solve
A homozygous recessive frog with spots is crossed with a heterozygous female with no spots. What is the probability of their offspring having spots? Male = ff Female = Ff Spots = F There is a 50% chance Of their offspring having spots f f F Ff Ff f ff ff
A heterozygous purple monster crosses with a homozygous recessive blue monster What are the two parent genotypes? Pp pp B. What are the possible offspring genotypes? 2 Pp 2pp C. What are the possible offspring phenotypes? 50% purple, 50% blue P p p P Yesterday’s Exit Pp pp Pp pp
2. True 3. False 4. C. Genotypes
E • I • H • J • C • D • B • F • G • A
Warm Up • Take out all Leveled Curriculum work from yesterday • Begin silently working
Due – End of class Today Level C – Complete 2 with * and 1 of choice (3) Level B - Complete 2 with * and 1 of choice (3) Level A – Complete the 1 assignment Directions Test Grade Work independently Copying = 0 for both people When you finish a level raise your hand to get signature Leveled Curriculum
Select ONE male and ONE female alien from front page, circle them Determine parent genotypes for each trait (write under directions) Skin Color - Eye Color - Height - Superpower - Arms Recessive = 2 lower case Dominant = you choose 2 capital or heterozygous 3. Complete Punnett Squares 4. Under Punnett Square write possible offspring phenotypes 5. Draw baby on back using traits from Punnett Squares 6. Explain the traits of your baby for EACH of the traits you made in the Punnett Squares Alien Genetics
Warm Up Put packet from Friday on your desk Write down the words below and an example of each into your notebook (use the letter t) • Homozygous Dominant • Homozygous Recessive • Heterozygous • Phenotype • Genotype • Inherited Trait • Acquired Trait • Allele
Homozygous Dominant > TT • Homozygous Recessive > tt • Heterozygous > Tt • Phenotype > characteristic – hair color • Genotype > combinations of alleles/letters in our genes – tt • Inherited Trait > something passed down ,eye color • Acquired Trait > something you change or learn, attitude • Allele > combinations of the same trait or gene represented by a letter T
height, hair texture, freckles • T, H, t, h • Combinations of alleles • Physical characteristics you can see • Tt, Hh, Ff • A capital letter • A lowercase letter • tt, hh, ff • ff • Tt