Name
Date
Per.
Complete Dominance Worksheet
YOU W S T SHOW YOUR WORK. FOR CREDIT
1. Mr. Hufford and Mrs. Hufford are expecting their first child. If Males have the genotype XY
and females have t h e genotype XX, What are the chances of the Hufford's having a girl?
2. If Brown eyes @) is dominant over not brown eyes (b). Margaret is homozygous dominant
for brown eyes. Her husband Fred has blue eyes. What is the percent chance that they will
have a child with brown eyes?
3. Beth has Frccklcs. Her husband Tmy has no freckles. IF Beth js heterozygous and Troy is
hornozygous recessive, what are the chances of them having a baby with freckles?
(F= freckles, f = no freckles)
4. Unattached earlobes are doninant over attached earlobes. Mr. and Mrs. Raker have attached
earlobes. What is the percent chance of them having a baby with unattached earlobes?
(A = unattached, a= attached)
5. Tongue roIIing is a dominant tmit, Mr. and Mrs, Dunbar are tongue roIIers, Their son
Michael can roll his tongue, but their daughter Sarah cannot, What must the genotypes of the
parent be? SHOW YOUR WORK. (F! = tongue rolling, r = not tongue roiling)
I_
6. Ian and his wife Sabrina have curly hair. They arc hoping for a baby with curly hair. 'If they
are both heterozygous, what is the percent chance of their wish coming true?
(H= curly, h = straight)
Complete Dominance Worksheet
7 Cross a heterozygous tall pea plant with a hlomosygous recessive s h m pea plant. What are the m u 1ting
genet-vpes? What is the percent chance you will have a taIl baby pea plant? (T=Tall, t=Short)
8. Cross two heterozygous brown mice. What are the resuIting genotypes? What is the percent chance you
will have a white mouse? (B = brown,, b = white)
9. Cross a homozygous red fish wiih a purple fish. What are the resulting genotypes? What is the percent
chance you will see purple baby fish? (R = red, s = purple)
10. If the results from a cross between two dogs is 3 brown and I black. What must the genotypes of the
parents be? @= Brown, b= black)
I 1. Pf you crossed a green male monster of UNKNOWN genotype with a yellow monster and you get 2
-e,n
monsters and 2 yelIow monsters. What is the genotype of the father? (G= green, g = yellow)
12. Make up your own question below:
-