Punnett Squares Based on the genotypes of parents, it is possible to predict the frequency of both genotypes and phenoty
Posted: Mon Jul 11, 2022 2:18 pm
Punnett Squares
Based on the genotypes of parents, it is possible to predict thefrequency of both genotypes and phenotypes of potentialoffspring. In this worksheet, you will be trying your hand atpredicting genotypes, phenotypes, and frequencies of traits usingPunnett Squares.
Googly Eyes (GG and Gg) is a dominat condition common in theMuppet community as is Loud Laughing (LL and Ll). Below aregenotypic crosses of Muppet parents expressing these alleles indifferent combinations. Complete all ten monohybridcross scenarios.
When writing genotypes and phenotypes, always record the mostdominant characteristic first, followed by the recessive. When you record phenotypic ratios for a monohybrid cross, there areonly two possible phenotypes - either the dominant phenotype or therecessive phenotype. So you do not need to indicate thegenoptype, simply put the dominant number first, followed by therecessive number.
For example: So, for Scenario 1 when you crossgenotypes Gg x gg, the Punnet Square would look something likethis:
G
g
g
Gg
gg
g
Gg
gg
Remember that genotype describes which genes (dominant orrecessive) an organism has for a particular trait. Thepossible genotype outcomes for the cross of these two parents forthis trait are Gg, Gg, gg, and gg. As such, the genotypicratio is written 2Gg:2gg.
And remember that phenotype is how something looks or how thetrait is physically presented.
The possible phenotypes for Googly Eyes are the dominant traitof Google Eyes (GG or Gg) or the recessive trait of no Googly Eyes(gg). So, you count up the number of dominant traits and thenumber of recessive traits and present them as a ratio.
In this case there are 2 dominant (Gg and Gg) and 2 recessive(gg and gg).
The phenotypic ratio would then be 2:2 (or reduced to 1:1) whichmeans that 50% of the offspring should have Googly Eyes and 50% ofthe offspring should not have Googly Eyes.
Scenario #
Genotype ofParent I
Genotype of Parent II
Genotypic Ratioof Offspring
Phenotypic Ratioof Offspring
1
Gg
gg
2
Gg
Gg
3
LL
ll
4
LL
Ll
5
Ll
Ll
6
Gg
GG
7
Ll
ll
8
GG
gg
9
ll
ll
10
gg
gg
Based on the genotypes of parents, it is possible to predict thefrequency of both genotypes and phenotypes of potentialoffspring. In this worksheet, you will be trying your hand atpredicting genotypes, phenotypes, and frequencies of traits usingPunnett Squares.
Googly Eyes (GG and Gg) is a dominat condition common in theMuppet community as is Loud Laughing (LL and Ll). Below aregenotypic crosses of Muppet parents expressing these alleles indifferent combinations. Complete all ten monohybridcross scenarios.
When writing genotypes and phenotypes, always record the mostdominant characteristic first, followed by the recessive. When you record phenotypic ratios for a monohybrid cross, there areonly two possible phenotypes - either the dominant phenotype or therecessive phenotype. So you do not need to indicate thegenoptype, simply put the dominant number first, followed by therecessive number.
For example: So, for Scenario 1 when you crossgenotypes Gg x gg, the Punnet Square would look something likethis:
G
g
g
Gg
gg
g
Gg
gg
Remember that genotype describes which genes (dominant orrecessive) an organism has for a particular trait. Thepossible genotype outcomes for the cross of these two parents forthis trait are Gg, Gg, gg, and gg. As such, the genotypicratio is written 2Gg:2gg.
And remember that phenotype is how something looks or how thetrait is physically presented.
The possible phenotypes for Googly Eyes are the dominant traitof Google Eyes (GG or Gg) or the recessive trait of no Googly Eyes(gg). So, you count up the number of dominant traits and thenumber of recessive traits and present them as a ratio.
In this case there are 2 dominant (Gg and Gg) and 2 recessive(gg and gg).
The phenotypic ratio would then be 2:2 (or reduced to 1:1) whichmeans that 50% of the offspring should have Googly Eyes and 50% ofthe offspring should not have Googly Eyes.
Scenario #
Genotype ofParent I
Genotype of Parent II
Genotypic Ratioof Offspring
Phenotypic Ratioof Offspring
1
Gg
gg
2
Gg
Gg
3
LL
ll
4
LL
Ll
5
Ll
Ll
6
Gg
GG
7
Ll
ll
8
GG
gg
9
ll
ll
10
gg
gg