Transcript Monohybrid Problems - Home

Monohybrid
Problems
General Rules to solving genetic
crosses using Punnett Squares.
1.
2.
3.
4.
5.
Make key
Write Parent Genotypes
Perform cross using square
Write Genotype and Phenotype ratios
Be sure to answer any additional questions.
Problem
1.In rabbits the allele for black coat color
(B) is dominant over the allele for brown
coat color (b). What is the genotypic
ratio and phenotypic ratio for a cross
between an animal purebred for black
coat color and one purebred for brown
coat color? What is the probability of
having the next baby rabbit with a black
coat?
1.In rabbits the allele for black coat color (B) is dominant over the allele for
brown coat color (b). What is the genotypic ratio and phenotypic ratio for a
cross between an animal purebred for black coat color and one purebred for
brown coat color? What is the probability of having the next baby rabbit with a
black coat?
1)Make a key:
Dominant:
Genotype?
Phenotype?
Recessive: Genotype?
Phenotype?
1.In rabbits the allele for black coat color (B) is dominant over the allele
for brown coat color (b). What is the genotypic ratio and phenotypic
ratio for a cross between an animal purebred for black coat color and
one purebred for brown coat color? What is the probability of having the
next baby rabbit with a black coat?
2) Write Parent Genotypes
Parent 1:
Genotype?
Phenotype?
Parent 2:
Genotype?
Phenotype?
1.In rabbits the allele for black coat color (B) is dominant over the allele
for brown coat color (b). What is the genotypic ratio and phenotypic
ratio for a cross between an animal purebred for black coat color and
one purebred for brown coat color? What is the probability of having the
next baby rabbit with a black coat?
3) Perform Cross Using Square
______ X ______
Parent 1
Parent 2
1.In rabbits the allele for black coat color (B) is dominant over the allele
for brown coat color (b). What is the genotypic ratio and phenotypic
ratio for a cross between an animal purebred for black coat color and
one purebred for brown coat color? What is the probability of having the
next baby rabbit with a black coat?
3) Perform Cross Using Square
1.In rabbits the allele for black coat color (B) is dominant over the allele for
brown coat color (b). What is the genotypic ratio and phenotypic ratio for a
cross between an animal purebred for black coat color and one purebred for
brown coat color? What is the probability of having the next baby rabbit with a
black coat?
4) Write Genotypes and Phenotypes
and Ratios
Ratios
Genotypes
-
1.In rabbits the allele for black coat color (B) is dominant over the allele
for brown coat color (b). What is the genotypic ratio and phenotypic
ratio for a cross between an animal purebred for black coat color and
one purebred for brown coat color? What is the probability of having the
next baby rabbit with a black coat?
5) Be sure to answer any
additional questions
What is the probability of having the
next baby rabbit with a black coat?
a) 0/4 (o%)
b) 1/4 (25%)
c) 2/4 (50%)
d) 3/4 (75%)
e) 4/4 (100%)
General Rules to solving genetic
crosses using Punnett Squares.
1.
2.
3.
4.
5.
Make key
Write Parent Genotypes
Perform cross using square
Write Genotype and Phenotype ratios
Be sure to answer any additional questions.