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WorksheetsGenetics Review
Total questions: 40
Worksheet time: 43mins
The __________ allele is always expressed in an organism when it is present.
dominant
hybrid
recessive
heterozygous
A genotype is
the alleles an organism has for a certain gene
the physical appearance of the trait
a sperm or egg cell
the letters seen on the outside of the Punnett square
The different forms of a gene are called
genotypes
alleles
hybrids
traits
The genotype of this flower is _____________
red
heterozygous
homozygous dominant
homozygous recessive
The genotype of this flower is ______.
homozygous dominant
heterozygous
pink
homozygous recessive
Rr X Rr
RR X Rr
A heterozygous round-seeded plant (Rr) is crossed with a homozygous dominant round-seeded plant (RR). What percentage of the offspring will be homozygous dominant?
100%
75%
50%
25%
R = round
r = wrinkled
B = short
b = long
What genotype would a homozygous recessive guinea pig have?
Smooth seeds are dominant over wrinkled seeds.
What is the genotype ratio of the offspring from the following cross?
Nn X NN
NN = 100%, Nn = 0%, nn = 0%
NN = 50%, Nn = 25%, nn = 25%
NN = 50%, Nn = 50%, nn = 0%
NN = 25%, Nn = 50%, nn = 25%
G = green g = yellow
Cross two plants that are heterozygous for green pods.
What is the phenotype ratio of the offspring?
25% green, 75% yellow
25% green, 75% yellow
50% green, 50% yellow
75% green, 25% yellow
What gamete possibilities could come from this parent's genotype?
AB and aB
Ab, AB, Ab, and ab
Ab only
AB, aB, and ab
What gamete possibilities could come from this parent's genotype?
aB, ab, AB, and Ab
Ab and AB
AA and bB
AB only
What goes in box 3?
Aabb
AABB
AAbb
aaBb
What is the correct phenotype ratio when crossing two heterozygous parents in a dihybrid cross?
100% heterozygous
1:2:1
3:1
9:3:3:1
What is the genotype ratio of the offspring from this cross?
TT = 25% Tt= 50% tt=25%
all tall
TT= 75% tt = 25%
Tt = 100%
In pea plants tall is dominant (T) over short plants (t), and green is dominant (G) over yellow (g). Cross a tall green pea plant (TtGg) with a short yellow pea plant (ttgg). What is the phenotype ratio of the offspring?
1: 2: 2: 1
9: 3: 3: 1
4: 4: 4: 4
3: 3: 3: 3
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.
This cross would be
BBEE x bbee
BBEe x BbEe
BbEE x BbEe
BBee x BBEE
What goes in box 15?
aabb
AABB
aaBB
AAbb
What ratio of the offspring from the cross shown will be homozygous recessive?
0 in 4
1 in 4
2 in 4
4 in 4
How many alleles (letters) does each person carry for each gene?
1
2
3
4
What is the phenotype ratio of the offspring from this cross? (Brown hair is dominant to blonde hair)
50 % Brown Hair and 50% Blond Hair
25 % Brown Hair and 75% Blond Hair
75 % Brown Hair and 25% Blond Hair
0% Brown Hair and 100% Blond Hair
The phenotype of this flower is _____________
red
heterozygous
homozygous dominant
homozygous recessive
What percent of this mother's eggs will have the dominant allele for BOTH genes?
50%
0%
100%
25%
In a dihybrid cross, how many possible phenotypes appear in the offspring?
2
8
4
3
In guinea pigs, black hair is dominant to white hair. You have a pet guinea pig with white hair. What genotype(s) COULD your guinea pig have?
BB only
BB or Bb
bb only
Your pet guinea pig Farfalle got pregnant and had pups! Farfalle has black hair, which you know is dominant to white hair. Farfalle had a play date 2 months ago with studly white-haired Couscous, so he must be the father, but ALL of Farfalle's pups have black hair. What is Farfalle's most likely genotype for the hair color gene?
Heterozygous
Homozygous dominant
Homozygous recessive
In a monohybrid cross, how many possible genotypes appear in the offspring?
2
8
4
3
Which of Mendel's laws states that alleles are separated during gamete formation?
Law of Dominance
Law of Segregation
Law of Independent Assortment
Which of Mendel's laws states that alleles are distributed to gametes independently of one another?
Law of Dominance
Law of Segregation
Law of Independent Assortment
Which are correct examples of gametes?
Skin cells and intestinal cells
Egg cells and sperm cells
Ovary cells and testicle cells
Dominant cells and recessive cells
Which of Mendel's laws does this statement demonstrate?:
If your genotype is Bb, then you can only pass a B or b to your child, but you can't pass both.
Law of Dominance
Law of Segregation
Law of Independent Assortment
Which of Mendel's laws does this statement demonstrate?:
Person A is smart and has brown hair while Person B is also smart and has blonde hair.
Law of Dominance
Law of Segregation
Law of Independent Assortment
Huntington’s disease is caused by a dominant allele. If a woman who is heterozygous for the trait marries a healthy man, what is the chance that their child will have the disease?
0%
50%
75%
100%
