A
Complete any 6 questions
1. In cats, a bobtail is recessive to a normal long tail. What would be the expected
genotypic and phonotypic ratios of the offspring of two heterozygous cats?
2. In oompa loompas, an orange face is dominant over a purple face. If a
homozygous orange faced oompa loompa married a purple faced oompa loompa
would they have any purple faced kids? (prove your answer with a Punnett
square)
3. In roses, red petals are dominant to white. What would be the phenotypic and
genotypic ratios if two heterozygous roses were crossed?
4. In sunflowers, tall stems are dominant to short stems. What are the expected
phenotypic and genotypic ratios if a short plant is crossed with a heterozygous
tall plant?
5. White color is dominant over yellow in squash. What are the expected
phenotypic and genotypic ratios if a heterozygous white fruited plant is crossed
with a yellow fruited plant?
6. In bikini bottom, Squarepants is dominant to roundpants. Sponge Bob is
heterozygous for square pants and Sponge Suzie has roundpants. What are the
expected phenotypic and genotypic ratios if they had children?
7. In humans the ability to roll your tongue is dominant to not being able to roll
your tongue. Answer both of the questions below and prove your answer with a
Punnett square:
a. Can two tongue rolling parents have a non-roller child?
b. Can two non rollers have a child that is a tongue roller?
8. In chimpanzees, straight fingers are dominant to bent fingers. Complete a
Punnett square to show the genotypes and phenotypes expected for a
heterozygous male crossed with a female with bent fingers.
9. In humans, polydactyly (extra fingers and toes) is dominant over the normal
number of digits. Suppose a man with the normal number of fingers has
children with a woman with polydactyl whose father had the normal number of
digits. What would be the predicted phenotypic and genotypic ratios of their
children?
10.
In humans cystic fibrosis is a recessive genetic disorder that causes
mucous to build up in the lungs and digestive tract. A healthy couple have their
first child and find out that the baby has cystic fibrosis. How is it possible that
two parents without the disorder can have a child with the disorder? Prove your
answer with a Punnett square.
Achondroplasia (dwarfism) is a dominant trait. On the show Little People,
Big World two parents with achrondroplasia have 4 kids: 3 of normal height, and
one that is a little person. How does that compare with the expected results?
Explain your answer with a Punnett square.
11.
B
Complete any 4 questions
1. Achondroplasia (dwarfism) is a dominant trait. On the show Little People, Big
World two parents with achrondroplasia have 4 kids: 3 of normal height, and
one that is a little person. How does that compare with the expected results?
Explain your answer with a Punnett square.
2. In humans the ability to roll your tongue is dominant to not being able to roll
your tongue. Answer both of the questions below and prove your answer with a
Punnett square:
a. Can two tongue rolling parents have a non-roller child?
b. Can two non rollers have a child that is a tongue roller?
3. In humans cystic fibrosis is a recessive genetic disorder that causes mucous to
build up in the lungs and digestive tract. A healthy couple has their first child and
later discover that the baby has cystic fibrosis. How is it possible that two
parents without the disorder can have a child with the disorder? Prove your
answer with a Punnett square.
4. In pea plants, round seeds are dominant over wrinkled seeds. Also, yellow seeds
are dominant over green. What are the expected phenotypic and genotypic
ratios if two plants heterozygous for both traits are crossed?
5. In bears, brown fur is dominant over black fur. Tongue color is also a genetic
trait. Red tongues are dominant to blue tongues. What would be the
phenotypic and genotypic ratios if a brown bear heterozygous for both traits
mates with a bear that has black fur and a blue tongue?
6. Unattached earlobes are dominant over attached earlobes. If a man with free
earlobes and a woman with attached earlobes have 10 children, all with free
earlobes, can we be certain the man is homozygous for the trait? If their
eleventh child has attached earlobes, does that prove the father’s genotype?
Support both of your answers with Punnett squares.
7. In humans the gene for brown eyes is dominant to the gene for blue eyes and
the gene for right handedness is dominant to left handedness. Two people that
are heterozygous for both traits marry and have children. What are the
expected phenotypic and genotypic ratios for their children?
8. In humans freckles and broad noses are dominant to no freckles and narrow
noses. Determine the expected phenotypic and genotypic ratios between a
woman heterozygous for both traits and a man with no freckles and a narrow
nose.
Complete 3 questions.
C
***If you choose to do #5 you
only need to do 2 questions***
1. Achondroplasia (dwarfism) is a dominant trait. On the show Little People, Big
World two parents with achrondroplasia have 4 kids: 3 of normal height, and
one that is a little person. How does that compare with the expected results?
Explain your answer with a Punnett square.
2. In humans freckles and broad noses are dominant to no freckles and narrow
noses. Determine the expected phenotypic and genotypic ratios between a
woman heterozygous for both traits and a man with no freckles and a narrow
nose.
3. Unattached earlobes are dominant over attached earlobes. If a man with free
earlobes and a woman with attached earlobes have 10 children, all with free
earlobes, can we be certain the man is homozygous for the trait? If their
eleventh child has attached earlobes, does that prove the father’s genotype?
Support both of your answers with Punnett squares.
4. In humans the gene for brown eyes is dominant to the gene for blue eyes and
the gene for right handedness is dominant to left handedness. Two people that
are heterozygous for both traits marry and have children. What are the
expected phenotypic and genotypic ratios for their children?
5. In Guinea pigs, black hair is dominant over white, rough coat texture is dominant
over smooth, and short hair is dominant over long hair. Assuming these genes
are on separate chromosomes, draw a Punnett square for a cross between a
homozygous black, rough, short haired Guinea pig and a white, smooth, longhaired one.
a. What would the phenotype of the offspring be?
b. Cross two of the F1 generation. What would be genotypic and phenotypic
ratios of the offspring be?
Hints: the Punnett square to cross the F1 generation requires an 8x8 square. Also find
all the possible gamete combinations (foil doesn’t work because there are now 3
alleles)