Punnett Squares Practice Classwork
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Biology: Notes/Classwork Name: Date: April 18 th , 2012 Punnett Square Practice Sheet 1.) In cabbage butterflies, white wings are dominant to yellow wings. Cross a heterozygous white-winged butterfly with a yellow-winged butterfly. a) Use capital and lowercase forms of the letter “w” to represent the alleles for this trait. _____ = White wings _____ = Yellow wings b) Using the word problem above, write down the phenotype of each parent. Parent # 1 = Parent # 2 = c) Using the word problem above, write down the genotype of each parent. Parent # 1 = Parent # 2 = _______ _______ Using the above punnett square, determine the possible genotypes and phenotypes of the offspring! Genotype Chance (Write as a fraction) Chance (Write as a Percentage) Phenotype Chance (Write as a fraction) Chance (Write as a Percentage)
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Transcript of Punnett Squares Practice Classwork
Biology: Notes/Classwork Name: Date: April 18th, 2012
Punnett Square Practice Sheet
1.) In cabbage butterflies, white wings are dominant to yellow wings. Cross a heterozygous white-winged butterfly with a yellow-winged butterfly.
a) Use capital and lowercase forms of the letter “w” to represent the alleles for this trait.
_____ = White wings_____ = Yellow wings
b) Using the word problem above, write down the phenotype of each parent.Parent # 1 = Parent # 2 =
c) Using the word problem above, write down the genotype of each parent.Parent # 1 = Parent # 2 = _______ _______
Using the above punnett square, determine the possible genotypes and phenotypes of the offspring!
Genotype Chance(Write as a fraction)
Chance(Write as a Percentage)
Phenotype Chance(Write as a fraction)
Chance(Write as a Percentage)
2.) Tongue-rolling in humans is a dominant genetic trait. Cross a heterozygous tongue-roller with another heterozygous tongue-roller.
Biology: Notes/Classwork Name: Date: April 18th, 2012
a) Use capital and lowercase forms of the letter “t” to represent the alleles for this trait.
_____ = Tongue-rolling_____ = Can’t roll tongue
b) Using the word problem above, write down the phenotype of each parent.Parent # 1 = Parent # 2 =
c) Using the word problem above, write down the genotype of each parent.Parent # 1 = Parent # 2 =
_______ _______
Using the above punnett square, determine the possible genotypes and phenotypes of the offspring!
Genotype Chance(Write as a fraction)
Chance(Write as a Percentage)
Phenotype Chance(Write as a fraction)
Chance(Write as a Percentage)
3.) In guinea pigs, short hair is dominant over long hair. Cross a heterozygous short-haired guinea pig with a long-haired guinea pig.
a) Use capital and lowercase forms of the letter “s” to represent the alleles for this trait.
_____ =Long Hair_____ = Short Hair
Biology: Notes/Classwork Name: Date: April 18th, 2012
a) Using the word problem above, write down the genotype of each parent.Parent # 1 = Parent # 2 =
_______ _______
Use the above punnett square to answer the following questions!a) What FRACTION of the offspring would be expected to have the genotype “Ss”?
b) What PERCENTAGE of the offspring would be expected to have the genotype “SS”?
c) What FRACTION of the offspring would be expected to have long hair?
d) What PERCENTAGE of the offspring would be expected to have short hair?
4.) In guinea pigs, rough coats are dominant over smooth coats. Cross a homozygous rough-coated guinea pig with a smooth-coated guinea pig.
a) Use capital and lowercase forms of the letter “r” to represent the alleles for this trait.
_____ =Rough Coat_____ = Smooth Coat
a) Using the word problem above, write down the genotype of each parent.Parent # 1 = Parent # 2 = ______ _______
Biology: Notes/Classwork Name: Date: April 18th, 2012
Use the above punnett square to answer the following questions!a) What FRACTION of the offspring would be expected to have the genotype “RR”?
b) What FRACTION of the offspring would be expected to have the genotype “rr”?
c) What PERCENTAGE of the offspring would be expected to have the genotype “Rr”?
d) What FRACTION of the offspring would be expected to have rough coats?
e) What PERCENTAGE of the offspring would be expected to have smooth coats?
5.) In dogs, deafness is caused by a recessive gene. Two dogs who carry the gene for deafness but have normal hearing are mated.
a) Use capital and lowercase forms of the letter “d” to represent the alleles for this trait.
_____ = Deaf_____ = Normal Hearing
a) Using the word problem above, write down the phenotype of each parent.Parent # 1 = Parent # 2 =
b) Using the word problem above, write down the genotype of each parent.Parent # 1 =Parent # 2 =
_______ _______
Use the above punnett square to answer the following questions!a) What PERCENTAGE of the offspring would be expected to have the genotype “dd”?
b) What PERCENTAGE of the offspring would be expected to have the genotype “Dd”?
c) What FRACTION of the offspring would be expected to have the genotype “DD”?
d) What PERCENTAGE of the offspring would be expected to have normal hearing?
e) What FRACTION of the offspring would be expected to be deaf?
