1. Punnett Square Problems Created by Peggy Lenz
4/16/2017
Genetics
Punnett Square Problems
Created by Peggy Lenz

2. Gray fur is dominant in mice over white
Gray fur is dominant in mice over white. A purebred gray mouse is crossed with a hybrid female. What color fur may their offspring have?

3. KEY G: P:

4. GG Gg GG Gg g G G G GG Gg gg G:1/2 GG, 1/2 Gg P: 4/4 gray fur G= gray
4/16/2017 g G
KEY
G= gray
g=white GG Gg G GG Gg gg GG Gg G
G:1/2 GG, 1/2 Gg
P: 4/4 gray fur

5. 4/16/2017
Aliens from Saturn usually have 3 eyes. A female with 2 eyes is crossed with a purebred, dominant 3 eyed male. Will any offspring have only 2 eyes?

6. 4/16/2017
KEY G: P:

7. Ee Ee Ee Ee e e E E EE Ee ee G:4/4 Ee P: 4/4 will have 3 eyes E=3 eyes
KEY
E=3 eyes
e=2 eyes Ee Ee E EE Ee ee Ee Ee E
G:4/4 Ee
P: 4/4 will have 3 eyes

8. The dominant gene S produces seeds in tomato plants
The dominant gene S produces seeds in tomato plants. Two plants both heterozygous are crossed. Will any any of the fruit contain no seeds?

9. KEY G: P:

10. SS Ss Ss ss s S S s SS Ss ss G:1/4 SS, 2/4 Ss, 1/4 ss
KEY
S= seeds
s= no seeds SS Ss S SS Ss ss Ss ss s
G:1/4 SS, 2/4 Ss, 1/4 ss
P: 3/4 seeds, 1/4 no seeds

11. INCOMPLETE DOMINANCE
A long tailed cat has a genotype of LL. A Manx cat with no tail has genotype NN. A short-tailed cat has genotype LN. A female Manx cat mates with a male short-tailed cat.

12. KEY G: P:

13. Could any of their kittens have long tails?
KEY N
LL=long
NN=no
LN=short LN LN L NN NN N LL NN LN
Could any of their kittens have long tails?

14. 4/16/2017 NO
WAY!