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1. For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho)
AA _____
Ee ____
Ii _____
Mm _____
Bb _____
ff ____
Jj _____
nn _____
Cc _____
Gg ____
kk _____
oo _____
DD _____
HH ____
LL _____
Pp _____
2. For each of the genotypes below determine what phenotypes would be possible.
Purple flowers (P) are dominant to white flowers (p).
Brown eyes(B) are dominant to blue eyes (b).
PP __________________
BB ________________
Pp __________________
Bb ________________
pp __________________
bb ________________
Round seeds are dominant to wrinkled seeds.
Bobtails (short tails) in cats are recessive.
RR __________________
TT _________________
Rr __________________
Tt _________________
rr __________________
tt __________________
3. For each adult genotype, determine what the possible gamete genotype would be:
AA
aa
Aa
bb
zz
ZZ
zZ
Cc
4. For each adult genotype, determine all of the possible gamete genotypes:
AABB
aabb
AAbb
AaBB
Aabb
aaBB
AaBb
CcTt
XxZz
5. For each phenotype below, list the genotypes (remember to use the letter of the dominant trait)
Straight hair is recessive to curly hair.
Pointed heads are dominant to round heads.
____ straight
_____ pointed
____ curly
_____ pointed
____ curly
_____ round
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Monohybrid Cross Problem Set
1.
Hank believes he is cursed. He had parents with the most hideous nose hairs, and they loved him enough to pass that trait
to him (He is homozygous recessive for the nose hair trait). Now, Hank married a woman named Helga, whose mother,
also had nose hair issues, but luckily took after her dad and escaped it. It wasn’t long before they were married and had a
child. Using a Punnett Square, what is the probability that this child will escape The Hair?
HH, Hh = no hair
hh = had the most unfortunate event of being born with a nose hair that may grow to be 6 inches long
Probability of escape (in percent form):
2.
Johnny is homozygous recessive for blue eyes (bb). Johnny married Julie who had brown eyes, just like her dad (Julie’s
mom had blue eyes). When they had their child Jasper, he had brown eyes. While we know that Jasper has brown eyes,
what was the probability of Jasper having brown eyes? Use a Punnet Square and use B for brown eyes and b for blue eyes.
Percent chance of a brown-eyed Jasper:
3.
Daddy dog has black fur and Mommy dog has black fur, how does the puppy have white fur? Create a punnett square to
show how this can happen. (Black fur BB, Bb-White fur bb)
4.
Puppy dog has long canines. He inherited them from his dad, who has the heterozygous trait, but his mommy has short
canines. Puppy dog found a mate who has short canines, but her mom has long canines as did her dad. What is the
probability of their puppies having long canines? Canines (long) DD and Dd; Canines (short) dd
Probability of protruding puppy canines in fraction form:
5.
Oompas generally have blue faces which is caused by a dominant allele (F).The recessive condition (f) results in an
orange face. Develop a "key" to show the genotypes and phenotypes possible for Oompa Loompas.
6.
A blue faced Oompa (homozygous) is married to an orange faced Oompa. They have 8 Oompalets. Predict what percent of
the offspring will have blue faces.
7.
In humans, the trait for a crooked little finger is dominant to the trait for a normal, straight little finger. If we have a male
that is heterozygous for the trait of a crooked little finger that is married to a female that has a straight little finger, then
what will be the genotype and phenotype ratio of their offspring?
Genotypes
Phenotypes
8.
In fruit flies, the gene for sepia colored eyes is recessive to the normal, red-eyed color. The male is heterozygous for the
trait of red eye color and the female has sepia colored eyes. They produce 100 offspring. How many should have sepia
colored eyes and how many should have normal, red eyes?
Number with sepia eyes
Number with red eyes
9.
Charlie and Barbara got married. They both have jungles of hair on their knuckles. They ended up having a child whom
they called Mary Jo. To their surprise, she did NOT have knuckle hair. How is this possible? Make a Punnett square. Kdominant.
10. Two ducks, Gertrude and Herkemer Sawonson, decide that it is time for ducklings. Gertrude lays eggs, and a year or so
later only 25% survive. Even though ¾ of the offspring died, Gertrude and Herkermer still want to know the probability of
their ducklings having blue eyes. Gertrude has brown eyes (her mother has blue eyes and her dad was homozygous
dominant for brown). Herkemer has sparkling blue eyes and a good personality.
What are the chances for blue eyes?
Brown eyes?
Name
Dihybrid Cross Problem Set
11. Enrique is homozygous for blue eyes (bb). He is ready for a family of his own. He decides to go to Coyote Ugly to shake
his honky-tonk badonkadonk. That night he finds his blue-eyed ducky soulmate (bb). After several chaperoned dates and a
lengthy engagement, they decide that they want to know what color their ducklings tail-feathers would be before they get
hitched. Enrique has magenta tail feathers (mm) and his fiancés tail-feathers are homozygous green dominant (MM) for
this trait. What color tail feathers and eye color are the offspring MOST likely to have?
Duckling tail feather color:
Duckling eye color:
12. In prafs from Metatheres, yellow eyes (Y) are dominant over pink eyes (y). Webbed feet (D) are dominant over hoofed
feet (d). Suppose a homozygous yellow-eyed, heterozygous web-footed praf mates with a pink-eyed, hoof-footed praf.
Could they have a baby praf with yellow eyes and hoofed feet? Explain your answer.
Explanation:
13. In tomatoes, red fruit color (R) is dominant over yellow fruit color (r), and tall vines (T) are dominant over short vines (t).
A variety called Yellow Giant has yellow fruit and tall vines. Another variety, Tiny Boy, bears red fruit on short vines.
Using purebred plants could a plant breeder cross Yellow Giant and Tiny Boy tomatoes and obtain a variety that is short
with yellow fruit? Explain your answer.
Explanation:
14. In some dogs, the trait for barking is dominant over the trait for non-barking. Also, erect ears are dominant over dropping
ears. The male is heterozygous for the barking trait and heterozygous for the trait of erect ears. The female is homozygous
for drooping ears and heterozygous for barking. What will be the genotypes and phenotypes of the pups?
Genotypes
Phenotypes
Exceptions to Mendel’s rules:
Multiple Alleles
15. If mom has blood type AB and the father has blood type O, what is the phenotypic ratio of a cross between these two?
What blood types are impossible for this offspring?
Phenotypic ratio:
Impossible blood types:
16. A woman with type AB blood marries a man with type A blood. His mother had type O blood. What blood type is not
likely to occur among this couple's children? Explain your answer.
Unlikely blood type :
Explanation:
17. A couple has four children. Their first child has type A blood, the second has type 0, the third has type AB, and the fourth
has type B. what are the genotypes of the parents?
Parental blood types :
18. In humans the gene for ABO blood type is inherited as codominant alleles. The gene for Rh positive (pos.) blood is
dominant over the gene for Rh negative (neg.) blood. Let’s talk about Bill. Bill is has blood type A negative, and has the
homozygous dominant genotype. Bill’s wife, Jill, is AB pos. and both of her parents were purebred for Rh pos. blood. Bill
and Jill have 4 children. How many should have blood type AB neg.?
Number with AB- blood:
Incomplete Dominance
19. When yellow guinea pigs (Y) are crossed with white guinea pigs (Y'), cream-colored offspring (YY') are produced. Can a
pet-store owner mate a cream-colored male and a white female to obtain yellow guinea pigs? Explain you answer.
Yes or No :
Explanation:
20. Oompas can have red (R), blue (r) or purple hair. Purple hair results from the heterozygous condition. Make a "key"
showing the genotypes and phenotypes for hair color. Is this an example of codominance or incomplete dominance? (hint
if you mix red and blue together you will get purple. Therefore purple hair is the intermediate phenotype.)
21. Orville Oompa has purple hair and is married to Opal Oompa who brags that she has the bluest hair in the valley. How
many of Opal's children will be able to brag about their blue hair also?
22. A cross between round radishes (R) and long radishes (R') produces oval radishes (RR'). In a radish-breeding experiment,
the following results were obtained: 25 long radishes: 52 oval radishes: 26 round radishes. Determine the probable
genotypes of the parent radish plants. Explain your answer.
Probable genotypes :
For questions 29 and 30, make up two of your own genetic problems. Be very specific in your description of the
situation. Be clear as to what you want someone to figure out. Start out on scratch paper until you’ve got them well
worded. Then, transfer them here:
23.
24.
Now provide detailed, complete and accurate answers to 29 and 30 below. Make sure you use a ruler to
create your Punnett Squares!