Bellwork 12115 Match the following terms to their
Bellwork: 12/1/15 Match the following terms to their examples 1. 2. 3. 4. 5. Homozygous dominant Heterozygous Dominant Recessive Phenotype A. Blue eyes B. Aa C. BB D. A E. a Have your alien page out for me to collect
Warm Up 12/7 • Title: Dihybrid Crosses • Page: 48 • Date: 12 -7 -16 • Essential Question: How can I find the probability of a child inheriting more than one trait?
Answer this question in your notebook (48. 1) Suppose that black hair (B) is dominant over blonde hair (b) and brown eyes (E) are dominant over blue eyes (e). The father has black hair (heterozygous) and brown eyes (heterozygous) and the mother has blonde hair and blue eyes. Genotype of father Bb. Ee Genotype of mother - bbee What are the chances you end up with a Blonde hair, blue eyed, offspring? ?
Announcements End 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 Cat Half Sheet- 70 today tomorrow 50 Monohybrid cross practice- 50 today tomorrow 0 To make up your quiz, go see a biology teacher in the tutorial lab today after school.
Test Day=Friday
What traits do you see pictured below? Fur color Dihybrid Cross: a cross that shows the possible offspring for two traits Fur length
What’s the phenotypic ratio? 9: 3: 3: 1
Dihybrid Cross: a cross that shows the possible offspring for two traits Fur Color: Texture: B: Black R: Rough b: White. Coat r: Smooth Heterozygous x Heterozygous Their genotypes will be: Bb. Rr x Bb. Rr
Dihybrid Crosses: a cross that shows the possible offspring for two traits BR Br b. R br BR BBRr Bb. RR Bb. Rr Br BBRr BBrr Bb. Rr Bbrr b. R Bb. Rr bb. RR bb. Rr br Bb. Rr Bbrr bb. Rr bbrr Bb. Rr x Bb. Rr Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth
How many of the offspring would have a black, rough coat? How many of the offspring would have a black, smooth coat? How many of the offspring would have a white, rough coat? How many of the offspring would have a white, smooth coat? BR Br b. R br BR BBRr Bb. RR Bb. Rr Br BBRr BBrr Bb. Rr Bbrr b. R Bb. Rr bb. RR bb. Rr br Bb. Rr Bbrr bb. Rr bbrr Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth
How many of the offspring would have black, rough coat? How many of the offspring would have a black, smooth coat? How many of the offspring would have a white, rough coat? How many of the offspring would have a white, smooth coat? Phenotypic Ratio= 9: 3: 3: 1 BR Br b. R br BR BBRr Bb. RR Bb. Rr Br BBRr BBrr Bb. Rr Bbrr b. R Bb. Rr bb. RR bb. Rr br Bb. Rr Bbrr bb. Rr bbrr Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth
Fractions Method Step 1: Split the traits for mom and dad DAD MOM Bb. Rr x Bb. Rr Bb Rr
Step 2: Create 2 punnett squares for the traits DAD B DAD b B BB Bb R R RR b bb r Rr MOM Bb MOM Step 3: Fill in the punnett squares r Rr rr
Step 4: Solve problems by multiplying fractions DAD B DAD b r Rr Rr rr B BB Bb R R RR b Bb bb r MOM Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth MOM How many of the offspring would have a black, rough coat? 3 4 X 3 4 = 9 16
Step 4: Solve problems by multiplying fractions DAD B DAD b r Rr Rr rr B BB Bb R R RR b Bb bb r MOM Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth MOM How many of the offspring would have a black, smooth coat? 3 4 X 1 4 = 3 16
Step 4: Solve problems by multiplying fractions DAD B DAD b r Rr Rr rr B BB Bb R R RR b Bb bb r MOM Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth MOM How many of the offspring would have a white, rough coat? 1 4 X 3 4 = 3 16
Step 4: Solve problems by multiplying fractions DAD B DAD b r Rr Rr rr B BB Bb R R RR b Bb bb r MOM Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth MOM How many of the offspring would have a white, smooth coat? 1 4 X 1 4 = 1 16
Hybrid= Heterozygous Purebred= Homozygous
1. *Hybrid* 2. *Purebred* What is the probability that the baby Reebop will have 2 antennae and 3 body segments?
1. *Hybrid* 2. *Purebred* A A AA a Aa A AA Aa 4 4 What is the probability that the baby Reebop will have 2 antennae and 3 body segments? X B b b Bb bb 2 4 8 = 16
1. *Hybrid* Characteristic eyes humps 2. Hybrid eyes Genotype / phenotype code EE = 2 eyes Ee = 2 eyes ee = one eye HH = 1 hump Hh = 1 hump hh = 3 humps What is the probability that the baby Reebop will have 2 eyes and 3 humps?
Characteristic Genotype / phenotype code eyes EE = 2 eyes Ee = 2 eyes ee = one eye humps HH = 1 hump Hh = 1 hump hh = 3 humps 2. hybrid eyes 1. *Hybrid* E E EE e Ee ee 3 4 What is the probability that the baby Reebop will have 2 eyes and 3 humps? X H h h Hh hh 2 4 6 = 16
In pea plants, yellow seeds (Y) are dominant over green seeds (y), and rounded peas (R) are dominant over wrinkled peas (r). Cross a plant that is heterozygous for both traits with a plant that is homozygous recessive for both traits. Genotypes: Yy. Rr and yyrr What is the probability that the plant will be yellow and wrinkled?
Y y Yy yy y r R Rr r rr r Rr rr How many of the offspring would have a yellow, wrinkled seed? 2 4 X 2 4 = 4 OR ¼ 16
What are the traits? What’s dominant/recessive?
Work on your Dihybrid practice for the rest of class. We’ll finish tomorrow
Trait Dominant Gene Recessive Gene Body size Small (S) Large (s) Snow Color White (W) Blue (w) Feet Snow feet absent (F) Snow feet present (f) Nose Style Long (L) Stubby (l) Use the chart to identify the genotype of the following traits: 1. Heterozygous long nose, large body: _____ Ll ss 2. Hybrid small body, homozygous white snow body: _____ Ss WW ff ll 3. Snow feet present, stubby nose: ______
Olaf’s best friend, Frosty the (large) Snowman was bragging that he’d found the most adorable snow lady to marry. Frosty loves his (hybrid) small lady’s cute snow feet and wants Olaf to figure out the chances that Frosty can hear the pitter patter of little snow feet running through the forest, even though Frosty doesn’t have any feet of his own (Ff). GREEN= Frosty RED= Frosty’s Hunny
Identify the genotypes: ss Ff 4. Frosty: large body, no feet: __________ 5. Frosty’s fiancée: small body, feet: _________ Ss ff 6. Frosty: long nose (hybrid), white body (hybrid) Ll Ww ____________ 7. fiancé: long nose (heterozygous), white body (heterozygous) ___________ Ll Ww 8. What is the probability that Frosty and his fiancé will have a large baby with snow feet? (Hint: Remember to multiply your fractions)
- Slides: 29
