Too Many Genes
Family Tree
Beyond Mendel
Blood Type This
Did you frequent my gene pool?
100
Fur color in rabbits has multiple alleles that follow the below dominance pattern. Write out all the possible genotypes for a dark gray coated rabbit.
CC
Ccch
Cch
Cc
100
The pedigree below tracks the presence of attached earlobes through a family's generation. Having attached earlobes is an autosomal recessive trait.What is the genotype of individual I-1?
Ee
100
In some chickens, feather color is controlled by codominance. When a black chicken mates with a white chicken, all of the offspring are covered in both black and white feathers.
A farmer mates a black chicken with a black-and-white chicken.
Determine the probability of getting specific genotype and phenotypes for the babies.
1/2 Black Chickens - genotype BB
and
1/2 Black-White Chickens - genotype BW
100
What blood type is each person?
Patient A: O-
Patient B: AB+
100
What are two selective forces on the hemoglobin gene in Africa?
Sickle Cell Anemia AND Malaria
200
A white coat and brown eyes is dominant in wolves. A wolf that is heterozygous for both traits mates with a brown coated- blue eyed wolf.
What are the genotypes and phenotypes of the two parents?
Parent 1: AaBb- white coat and brown eyes
Parent 2: aabb- brown coat and blue eyes
200
The pedigree below tracks Duchenne Muscular Dystrophy (DMD) through several generations. DMD is an X-linked recessive trait. What is the genotype of individual II-2?
200
This is an example of:
Incomplete Dominance
200
What types of blood can Patient A and Patient B receive?
Patient A: O- (can only receive O-)
Patient B: AB+ (can receive them all)
200
How is a genotype different than an allele?
A genotype consists of two alleles- every nucleus in your body has two alleles for every gene
An allele is specific version of a gene. Two different alleles for a gene might have slightly different genotypes. One of the alleles could be dominant and the other one could be recessive.
300
Dobby the House Elf marries another house elf named Dabbin. Dobby’s pointed ears are dominant, and he knows that he is heterozygous for ear shape. Dabbin’s ears are round. Dobby’s long nose is a recessive trait, and Dabbin’s is homozygous dominant for her stubby nose.
Determine the genotype and phenotype of Dobby and Dabbin.
Dobby: Ee aa - pointed ears and long nose
Dabbin: ee AA - Round ears and stubby nose
300
This pedigree depicts the inheritance pattern of Huntington's disease, a autosomal dominant trait. If individuals II-7 and II-8 have another child, what is the likelihood that they will have this disease?
1/2
300
In snapdragon plants, the gene for red petals (R) is incompletely dominant to the gene for white petals (r). Individuals that are heterozygous (Rr) have pink petals.
A plant with pink petals is crossed with a plant with white petals. What is the chance that the offspring will have red petals?
1/2 pink and 1/2 white are the phenotype possibilities.
0% will be red
300
A man with type AB blood is married to a woman also with type AB blood. What is the probability of their children having:
Type A: ____
Type B: ____
Type O: ____
Type AB: ____
Type A: __1/4__
Type B: _1/4___
Type O: __0__
Type AB: __1/2__
300
A population of 9 flowers was examined in a garden. There are two alleles that code for flower color: (A) which encodes for the purple allele ... and (a) which encodes for the white allele. If the population has 6 AA, 1 Aa, and 2 aa genotypes, what are the frequencies of the A and a alleles in the population?
Frequency for A: 72%
Frequency for a: 28%
400
There are three genes that are important for the development of the human hand.
Hand length, where long is dominant to short
Hand thickness, where thick is dominant to thin
Softness, where soft is dominant to rough.
You cross a woman with short thick hands that are rough with a man who has long thin hands that are soft. Each parent who has a dominant allele is heterozygous.
What is the genotypes and phenotypes for each parent?
A = Long. a= short
B = Thick b= thin
R = Soft r= rough
Parent 1: aaBbrr
Parent 2: AabbRr
400
The affected individuals have an X-linked recessive disorder. This couple is due to have a 6th child and they found out it’s a boy. What will his phenotype be? Explain your answer.
Will have a 100% chance of having the disease because the mom has it, and each boy gets 1 X chromosome from their mom.
400
Coat color in rabbits depends on the 3 alleles below.
A rabbit breeder crosses a dark gray rabbit (Ccch) with a chinchilla rabbit (cchc). What are the predicted phenotypes of their offspring?
1/2 Dark Gray and 1/2 chinchilla 
400
A man with type AB blood marries a woman with type O blood. They have two natural children and one adopted child. The children's blood types are A, B, and O. Which child is adopted?
The child with the O blood type is adopted.
400
A population people living in Antarctica have two alleles that code for tallness (T) or shortness (t). Tallness is dominant over shortness. If the population has 90TT, 40Tt, and 70tt genotypes, what will be the frequencies of the T and t alleles in the population?
Frequency of T: 55%
Frequency of t: 45%
500
About 70% of Americans get a bitter taste from the substance called phenylthiocarbamide (PTC). It is tasteless to the rest. The "taster" allele is dominant to non-taster. Also, normal skin pigmentation is dominant to albino. A normally pigmented woman who is a non-taster has an albino-taster father.
She marries an albino man who is a taster, though the man's mother is a non-taster. What are the genotypic and phenotypic probabilities for the expected offspring of this couple?
Key: A = taster. a= non taster
B= Normal Skin. b= albino
Parent Genotypes:
Mom:aa Bb (normal skin and non taster)
Dad: Aa bb
1/2 Bb = Normal Skin
1/2 bb = Albino
1/2 Aa= Taster
1/2 aa = non-taster.
500
A couple who are planning to have a baby are concerned that they will have a child with hemophilia, an X-linked recessive disorder.
Both the woman and the man are healthy, but the woman knows that she is a carrier. Each person also had a brother who died of hemophilia at a young age. Both the man and woman have healthy parents.
Draw a pedigree of this family, include all genotypes and determine the likelihood that this couple will have a kid with hemophilia.
The woman (II-3) has a genotype of XHXh
Likelihood of them having a baby with hemophilia will be 1/4
500
There are multiple alleles for feather color in pigeons.
Using a Punnett square, show a cross among an ash-red heterozygous male who also carries the chocolate allele, and a blue heterozygous female. Record all possible phenotypes as their expected percentage.
1/2 ash-red feathered offspring
1/4 blue feathered offspring
1/4 chocolate feathered offspring
500
A woman who is blood type AB has a child that is blood type A.
What are the all the possible genotypes of the daddy?
Since the problem doesn't state- the child could have a genotype of IAi or IAIA
So the possibilities of daddy could be:
1) IAi
2) IAIA
3) IBi
4) IAIB
5) i i
500
A hypothetical population of 100 humans has 68 individuals with the blood type AA, 20 individuals with blood type AB and 12 individuals with the blood type BB. What is the frequency of each allele in this population?
Frequency of A: 78%
Frequency of B: 22%