Punnett Square
Dihybrid Cross
Pedigree Charts
Vocabulary
Inheritance Types
100
Black (B) is dominant over Blonde (b) fur color. Both parents are heterozygous black mice. What is the percentage of their offspring having blonde fur?
25%
100
In a dihybrid cross, _________ pairs of contrasting traits are being crossed.
two
100
What shape represents girls? Boys?
Girls= Circle
Boys= Square
100
Genetic component of an individual
genotype
100
How many alleles (letters) does a child get from each parent for each trait?
1
200
In a certain fish, blue scales (BB) and red scales (bb) are codominant. When a fish has the hybrid genotype, it has a patchwork of blue and red scales. If you breed a patchwork fish with a fish that only has Blue Scales, what is the probability of having fish with red scales?
0%
200
The Law of _______________ states that alleles of two or more different genes gets sorted into gametes independently of one another. The allele a gamete receives for 1 gene does not influence the allele received for another gene.
Law of Independent Assortment
200
What is the genotype of individual 2 in generation 1?
Ff
200
Genes that have more than two alleles
multiple alleles
200
In a certain fish, blue scales (BB) and red scales (bb) are codominant. When a fish has the hybrid genotype, it has a patchwork of blue and red scales. (Use the letter B). What is the genotype for patchwork fish?
Bb
300
In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (r). A pink-flowered plant is crossed with a white-flowered plant. What is the probability of producing a pink-flowered plant?
50%
300
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
3/16
300
What is the genotype of individual 3 in generation II?
Ff
300
Traits that are controlled by more than one gene
Polygenic traits
300
A cross between a red flower and a white flower produces red and white spotted flowers. Which type of inheritance pattern is indicated by these results?
Codominance
400
What is the probability of homozygous dominant offspring if you cross a heterzygous father and a homozygous recessive mother?
0%
400
A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits. What are the genotypes for the cross?
BBEE x bbee
400
The following pedigree chart shows ___ females and ___ males that DO NOT have the trait.
The following pedigree chart shows 4 females and 4 males that DO NOT have the trait.
400
There are two copies of each gene in the cell and during meiosis these alleles are separated so that each gamete only contains one gene
Mendel's Law of Segregation
400
In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (r). The heterozygous genotype is expressed as pink. What is the phenotype of a plant with the genotype RR?
Red
500
What is the possibility of having a child with type B blood with a type “O” mother and a type “AB” father?
50%
500
Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What is the probability of having Round and Yellow seeds?
100%
500
What is the probability of individual 6 in generation III having offspring without freckles if the second parent is a carrier?
Individual 6 genotype is ff, second parent is Ff.
50% off offspring will not have freckles
500
Traits that are found on the X chromosome and are inherited regardless of gender
Autosomal traits
500
Another two parents also think their baby was switched at the hospital. They are blonde and the baby has red hair. The mother has blood type “A,” the father has blood type “B,” and the baby has blood type “AB.” What is the fathers' blood genotype?
IBIB or IBi