1. HW: Study Guide & Test Friday
Wednesday
April 26, 2017
I can:
review concepts of genetics and Punnett Squares
Agenda
(10) Catalyst
(15) Review: Punnett Squares
(30) My Favorite NO
(15) Kahoot!
(15) Study Guide
Catalyst
How can twins with identical DNA look/behave differently?
Identify the technology:
Separates strands of DNA by size to create a fingerprint
Makes identical copies of an organism
Organisms with DNA from different species
Undifferentiated cells
HW: Study Guide & Test Friday
Unit 4 Packet due Monday

3. How to complete a Punnett Square:
The allele combinations that might result from a cross can be determined by drawing a Punnett Square.
father = Bb, mother = bb
How to complete a Punnett Square: B b
1. Draw the Punnett Square.
2. Place the father's alleles on the top of the Punnett square, one letter per box. B b b b b
3. Place the mother's alleles on the left side of the square, one letter per box. B b b b b
4. Drop the father's alleles down into the squares and bring the mother's across.
Now you have all possible allele combinations for the offspring.

4. Question 1
A man with type AB blood marries a woman with type O blood. What percent of their children will have type A blood?
Type of inheritance?
Alleles?
Parental genotypes?
Answer to question?
Co-dominance
IA = type A
IB = type B
i = type O IA IB
IAi
IBi i
IAIB x ii
IAi
IBi i
50% type A blood

5. Question 2
Snapdragons can be red, white or pink. If a red snapdragon is crossed with a white snapdragon, what percent of the offspring will be pink?
Type of inheritance?
Alleles?
Parental genotypes?
Answer to question?
Incomplete
R = red
W = white R R RW RW W
RR x WW RW RW
100% pink W

6. Question 3
Hemophilia (h) is a recessive genetic disorder carried on the X chromosome. If a man with hemophilia marries a woman who is a carrier, what percent of their daughters will have hemophilia?
Type of inheritance?
Alleles?
Parental genotypes?
Answer to question?
Sex-linked
XH = no hemophilia
Xh = hemophilia Xh Y
XHXh
XHY XH
XhY x XHXh
XhXh
XhY Xh
50% daughter with
hemophilia

7. Question 4
Green seeds (G) are dominant to yellow seeds (g) in peas. If a homozygous dominant plant is crossed with a plant with yellow seeds, what percent of the offspring will have yellow seeds?
Type of inheritance?
Alleles?
Parental genotypes?
Answer to question?
Complete
G = green
g = yellow G G Gg Gg g
GG x gg Gg Gg
0% yellow g

8. My Favorite NO
This protocol is designed to allow us to learn together from our mistakes.
For each question displayed on the screen, you will write down on an index card:
what you know (alleles, parental genotype, Punnett Square)
what that implies about the correct answer
letter of the correct answer with a box around it
your name on the back of the card
After 2 minutes for each question, pass your cards to the person at the end of your row. Someone will come and collect the cards.

9. Question 1
A cleft chin in humans is coded by the dominant allele C. A chin without a cleft is coded by the recessive allele c. A man with a cc allele combination for the trait produces a zygote with a woman with a Cc allele combination for the trait. Which allele combinations could occur in the zygote?
Cc or cc
CC o rCc
CC only
Cc only
End

10. Question 2
Two parents have blood type A, and they are both heterozygous for this trait. What is the chance they will have a child with a homozygous genotype? 0%
25%
50%
75%
End

11. Question 3
A daughter has hemophilia, a recessive sex-linked trait. Which are possible genotypes of her parents?
XHXh and XhY
XHXH and XhY
XhXh and XHY
XHXh and XHY
End

12. Question 4
A woman with blue eyes has a brown ­eyed son. He marries a woman with blue eyes. What is the probability that they will have a a blue ­eyed child?
0 in 4
1 in 4
1 in 2
3 in 4
End