1. Monday January 9, 2017
Learning Target: Same as Friday 1/6 Science Starter: Turn to pages in workbook 2. How do you feel about Genotype& phenotype?
Supplies: Genetics Workbook & HW 15 & Probability and Genetic Crosses Page

2. Announcements Heartbeat
Vocabulary—Make flashcards or see Mrs. Hinds website for Quizlet
Test Wednesday over Punnett Squares
HW #15 due Tomorrow
Homework questions of the day:
1B, 1E, 2E, 3AB, 3CD, 3E, 5BC, 5DE
Homework question 4—only choose 1 of the 4 options…you do not have to do all 3

3. Probability—Write down the Green or bright yellow Extra page, pgs
Probability—Write down the Green or bright yellow Extra page, pgs in workbook
If you roll one die, what’s the probability of rolling a 6?
1/6
(1 out of 6)
If you pull one card from the deck, what’s the probability of getting the ace of hearts?
1/52
(1 out of 52)
If you flip a coin, what’s the probability of landing on heads?
1/2
(1 out of 2)

4. A Genetic Cross
Gregor Mendel (1865) discovered that probability could be used to predict the results of a genetic cross mating)?
If you know parent genotypes, you can predict offspring genotypes

5. A Genetic Cross ♀ Bb x ♂ bb Bb, Bb, bb, bb Example: Brown hair (B) is
If you know parent genotypes, you can predict offspring genotypes
Example:
Brown hair (B) is
dominant to blond hair (b).
What are the possible
genotypes for their
offspring? Bb bb
♀ Bb x ♂ bb
Bb, Bb, bb, bb

6. 2/4 (50%) chance of brown hair
A Genetic Cross
If you know parent genotypes, you can predict offspring genotypes
Example:
Brown hair (B) is
dominant to blond hair (b).
What is the probability that
the Incredibles’ next child
will have brown hair? Bb bb
♀ Bb x ♂ bb
Bb, Bb, bb, bb
2/4 (50%) chance of brown hair

7. Practice
In pea plants, smooth peas (S) are dominant to wrinkled peas (s).
A purebred smooth pea is crossed with a wrinkled pea.
♀ _____ x ♂ _____

8. Practice
In pea plants, smooth peas (S) are dominant to wrinkled peas (s).
A purebred smooth
pea is crossed with a
wrinkled pea.
Determine the possible
offspring genotypes &
phenotypes.
♀ SS x ♂ ss
Ss, Ss, Ss, Ss
100% chance of smooth peas

9. Practice In guinea pigs, dark fur (D) is dominant to light fur (d).
Cross a hybrid dark guinea pig with a light guinea pig.
♀ _____ x ♂ _____

10. Practice In guinea pigs, dark fur (D) is dominant to light fur (d).
Cross a hybrid
dark guinea pig with a
light guinea pig.
Determine the possible
offspring genotypes &
phenotypes.
♀ Dd x ♂ dd
Dd, Dd, dd, dd
50% chance of dark fur
50% chance of light fur

11. A Genetic Cross
If you know offspring genotypes, you can predict parent genotypes
Example:
Brown eyes (B) are
dominant to blue eyes (b).
If Dash’s genotype is bb,
what are his parents’
genotypes? Bb ? bb ? bb

12. Practice In guinea pigs, dark fur (D) is dominant to light fur (d).
Two dark-fur guinea
pigs produce a light-fur
offspring.
What is the genotype
of the offspring? dd

13. Practice In guinea pigs, dark fur (D) is dominant to light fur (d).
Two dark-fur guinea
pigs produce a light-fur
offspring.
What must the parent
genotypes be? Dd ? Dd ? dd

14. Punnett Squares
Created by Reginald Punnett (1900) to make predicting the outcome of genetic crosses easier
show all the possible
outcomes of a genetic
cross
show the probability
of each outcome
25%
25%
25%
25%

15. Punnett Squares Example: In dogs, short hair (S) is dominant to
show all the possible outcomes of a genetic cross
show the probability of each outcome
Example:
In dogs, short
hair (S) is
dominant to
long hair (s).
Determine the possible
offspring phenotypes.
♂ SS
S S
25% S s SS SS
♀ Ss Ss Ss
100% chance of short hair

16. Why Use a Punnett Square?
Most scientists study MANY traits at one time
It gets VERY confusing without a Punnett Square!

17. 50% chance of straight toes
Practice
In humans,
straight toes (S)
is dominant to curled toes (s).
Determine the possible
results for a cross
between a recessive
male & hybrid
female.
♂ ss
s s
25% Ss Ss S s
♀ Ss ss ss
50% chance of straight toes
50% chance of curled toes

18. Special Cases ? Incomplete dominance Example: Carnations
Neither allele is dominant
Hybrid = in BETWEEN phenotypes
Example:
Carnations
CRCR = ?
CRCW =
CWCW =

19. Special Cases ? Codominance Example: Cows Neither allele is dominant
Hybrid = BOTH phenotypes
Example:
Cows
HWHW = ?
HWHB =
HBHB =

20. Lets practice— turn to pgs. 23-24
Heterozygous—Hybrid (H)
Homozygous—Purebred (P)

21. Closing—Did we hit our learning Target?
Show Mrs. Hinds or Ms. Hall
Page 23 in your workbook
(Does not have to be complete)

22. Tuesday January 10, 2017
Learning Target: Use a Punnett square to predict the traits of offspring Science Starter: Turn in HW Pick up HW 16– 1A, 2A, 2CD 3. Turn to pages in workbook
Supplies: Genetics Workbook & HW 15 & HW 16 & Probability and Genetic Crosses Page

23. Closing—Did we hit our learning Target?
Answer the following on a notecard:
Let’s say that long fur (L) is dominant to short fur (l). Can 2 purebred dogs with long fur have an offspring with short fur?
EXPLAIN!!!

24. Announcements Heartbeat Test Wednesday over Punnett Squares
Workbook Review Punnett Squares
Pgs
(These pages must be checked by Mrs. Hinds or Ms. Hall.)
If you finish these pages and are signed off, then you may begin Quizzizz. Stay tuned for GAME CODE
If you finish Quizzizz, then you may play Punnett Square basketball off the More tab and click on Useful Links.