For each of the following, show the Punnett Square and give the Genotype AND Phenotype for each on your own paper! 1. In human, brown eyes are dominant over blue eyes. What type of offspring would you expect if you crossed a heterozygous brown eyed person to a heterozygous brown eyed person? 2. A widow's peak hairline is dominant to straight hairline. Cross a heterozygous widow's peak hairline person to a straight hairline person. 3. In humans premature gray hair is dominant over normal hair coloring. Cross a homozygous premature gray haired person to a homozygous normal haired person.

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Monohybrid Practice Problems
For each of the following, show the Punnett Square and give the Genotype AND
Phenotype for each on your own paper!
1. In human, brown eyes are dominant over blue eyes. What type of offspring would you
expect if you crossed a heterozygous brown eyed person to a heterozygous brown eyed
person?
2. A widow's peak hairline is dominant to straight hairline. Cross a heterozygous widow's
peak hairline person to a straight hairline person.
3. In humans premature gray hair is dominant over normal hair coloring. Cross a
homozygous premature gray haired person to a homozygous normal haired person.
4. In humans tongue rolling is dominant to non-tongue rolling. What would be the
expected type of offspring if a homozygous tongue roller was crossed to a heterozygous
tongue roller?
5. Brown hair is dominant over light colored hair. Cross two light haired people.
6. In a certain plant yellow fruit is dominant to white fruit. A heterozygous plant with
yellow fruit is crossed with a plant with white fruit. Determine the probable offspring.
7. In a certain animal, black fur is dominant to white fur. Determine the possible offspring
from crosses between:
a. Homozygous black x white
b. Heterozygous black x heterozygous black
8. In garden peas, round peas are dominant to wrinkled peas. If you crossed a
homozygous dominant and homozygous recessive what would be the genotype and
phenotype of the offspring?
9. In corn, normal kernels are dominant to waxy kernels. If you crossed a waxy kernel
plant to a heterozygous normal plant what type of seeds would be produced?
10. Tall plants are dominant to short plants in the garden pea plant. Cross a
heterozygous tall plant to a heterozygous tall plant.
Transcribed Image Text:Monohybrid Practice Problems For each of the following, show the Punnett Square and give the Genotype AND Phenotype for each on your own paper! 1. In human, brown eyes are dominant over blue eyes. What type of offspring would you expect if you crossed a heterozygous brown eyed person to a heterozygous brown eyed person? 2. A widow's peak hairline is dominant to straight hairline. Cross a heterozygous widow's peak hairline person to a straight hairline person. 3. In humans premature gray hair is dominant over normal hair coloring. Cross a homozygous premature gray haired person to a homozygous normal haired person. 4. In humans tongue rolling is dominant to non-tongue rolling. What would be the expected type of offspring if a homozygous tongue roller was crossed to a heterozygous tongue roller? 5. Brown hair is dominant over light colored hair. Cross two light haired people. 6. In a certain plant yellow fruit is dominant to white fruit. A heterozygous plant with yellow fruit is crossed with a plant with white fruit. Determine the probable offspring. 7. In a certain animal, black fur is dominant to white fur. Determine the possible offspring from crosses between: a. Homozygous black x white b. Heterozygous black x heterozygous black 8. In garden peas, round peas are dominant to wrinkled peas. If you crossed a homozygous dominant and homozygous recessive what would be the genotype and phenotype of the offspring? 9. In corn, normal kernels are dominant to waxy kernels. If you crossed a waxy kernel plant to a heterozygous normal plant what type of seeds would be produced? 10. Tall plants are dominant to short plants in the garden pea plant. Cross a heterozygous tall plant to a heterozygous tall plant.
Monohybrid Cross Problems 2
For each of the following, show the Punnett Square and give the Genotype AND
Phenotype for each on your own paper!
1. A tall plant of unknown genotype is test-crossed (meaning it is crossed with a
recessive tt plant). Of the offspring, 869 are dwarf and 912 are tall. What is the genotype
of the unknown parent, is it TT or Tt? Show the cross to prove it.
2. In humans, tongue rolling is a dominant trait. Those with the recessive condition
cannot roll their tongues. Bob can roll his tongue, but his mother could not. He is married
to Sally, who cannot roll her tongue. What is the probability that their first born child will
not be able to roll his tongue?
3. In goats, a recessive gene causes the goats to "faint" when they are startled. A farmer
breeds two goats that have never fainted and their first offspring faints two days after its
birth. What must the parent's genotypes have been? Show the cross to prove it.
a. What parental genotypes are needed to result in 100% fainting goats?
b. What parental genotypes will result in % of offspring being fainting goats?
4. In guinea pigs, black eyes are dominant to red eyes. A male guinea pig that is
heterozygous is crossed with a female that is red eyed. What are the expected
phenotypes of their offspring and in what proportion?
a. If out of 100 offspring 52 have red eyes and 48 have brown eyes, what are the
probable genotypes AND phenotypes of the parents?
b. What is the genotype of the parent needed to produce 75% black eyed
offspring when crossed with a heterozygous black eyed parent?
Transcribed Image Text:Monohybrid Cross Problems 2 For each of the following, show the Punnett Square and give the Genotype AND Phenotype for each on your own paper! 1. A tall plant of unknown genotype is test-crossed (meaning it is crossed with a recessive tt plant). Of the offspring, 869 are dwarf and 912 are tall. What is the genotype of the unknown parent, is it TT or Tt? Show the cross to prove it. 2. In humans, tongue rolling is a dominant trait. Those with the recessive condition cannot roll their tongues. Bob can roll his tongue, but his mother could not. He is married to Sally, who cannot roll her tongue. What is the probability that their first born child will not be able to roll his tongue? 3. In goats, a recessive gene causes the goats to "faint" when they are startled. A farmer breeds two goats that have never fainted and their first offspring faints two days after its birth. What must the parent's genotypes have been? Show the cross to prove it. a. What parental genotypes are needed to result in 100% fainting goats? b. What parental genotypes will result in % of offspring being fainting goats? 4. In guinea pigs, black eyes are dominant to red eyes. A male guinea pig that is heterozygous is crossed with a female that is red eyed. What are the expected phenotypes of their offspring and in what proportion? a. If out of 100 offspring 52 have red eyes and 48 have brown eyes, what are the probable genotypes AND phenotypes of the parents? b. What is the genotype of the parent needed to produce 75% black eyed offspring when crossed with a heterozygous black eyed parent?
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