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WorksheetsGenetics Review
Total questions: 35
Worksheet time: 50mins
Name
Class
Date
1.
How many alleles does each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
2.
How many alleles does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
3.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
4.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
c)
blood types
d)
Egg sizes
5.
B = brown eyes; b = blue eyes
Brown eyes are dominant to blue eyes
What is true about the following two brothers that have brown eyes?
Brother 1: BB
Brother 2: Bb
Brown eyes are dominant to blue eyes
What is true about the following two brothers that have brown eyes?
Brother 1: BB
Brother 2: Bb
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
6.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
7.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
8.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
9.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowered plant from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
10.
If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring? Tall is dominant to short.
a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
d)
25%TT, 50%Tt, 25%tt
11.
What is a phenotype?
a)
The physical expression of a trait; what you see.
b)
The genetic representation of a trait
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
12.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed? Brown eyes are dominant to blue eyes.
a)
0 %
b)
25%
c)
50%
d)
75%
13.
Mark is a tall, 11 year old boy. He has a scar on his right cheek. He is intelligent and an excellent drummer. Which of his traits did he most likely inherit?
a)
height
b)
the scar
c)
his intelligence
d)
ability to play drums
14.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
15.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
16.
Colorblindness is a recessive, sex-linked disorder on the X chromosome. Cross the parents in the picture to figure out which percentage of their offspring will be colorblind.
a)
25%
b)
0%
c)
75%
d)
50%
17.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
18.
T= tall; t= short
What are the genotypic ratios of the cross in the picture?
What are the genotypic ratios of the cross in the picture?
a)
1:3
b)
3:1
c)
1:2:1
d)
2:2
19.
T= tall; t= short
What are the phenotypic ratios of the cross in the picture?
What are the phenotypic ratios of the cross in the picture?
a)
1:3
b)
3:1
c)
1:2:1
d)
2:2
20.
A corn plant that is heterozygous tall mates with a corn plant that is short. If tall plants are dominant to short, how many different phenotypes are possible in the offspring?
a)
1
b)
2
c)
3
d)
4
21.
If a red snapdragon and a pink snapdragon were crossed, what percentage of the offspring would be white?
Red and white show incomplete dominance to produce pink in snapdragons.
Red and white show incomplete dominance to produce pink in snapdragons.
a)
0%
b)
25%
c)
50%
d)
75%
22.
Red/green color blindness is a recessive sex-linked trait on the x chromosome. A woman who has normal vision but is a carrier for this allele marries a normal-vision male. What is the probability that they will have a child who is color blind?
a)
1/4
b)
1/2
c)
3/4
d)
1
23.
Red flower (R) color is dominant to white flower (r) color in rose plants. What are the expected phenotypic results of a cross between two heterozygous (Rr) rose plants?
a)
100% red
b)
75% red, 25% white
c)
50% red, 50% white
d)
75% white, 25% red
24.
Who is considered the "father of genetics"?
a)
Gregor Mendel
b)
Reginald Punnett
c)
James Watson
d)
Matthias Schleiden
25.
A trait that, when present, masks the other traits is a(an) ________________________
a)
recessive trait
b)
aggressive trait
c)
absent trait
d)
dominant trait
26.
The process in sexual reproduction in which male and female reproductive cells join to form a new cell.
a)
gene
b)
gamete
c)
fertilization
d)
allele
27.
Having two of the SAME alleles for a trait (example HH or hh):
a)
homozygous
b)
heterozygous
c)
recessive
d)
dominant
28.
In mussels, the allele for brown coloring (B) is dominant, and the allele for blue coloring (b) is recessive. Which parents would have to cross to have a 100% chance of blue offspring?
a)
BbxBb
b)
bbxbb
c)
BBxbb
d)
BBxBB
29.
What is the cause of some traits "skipping" a generation?
a)
dominant traits
b)
recessive traits
c)
hybrid alleles
d)
homologous chromosomes
30.
A person heterozygous for wet earwax mates with a person homozygous recessive for dry earwax. What is the chance their baby is heterozygous?
Wet earwax is dominant to dry earwax.
Wet earwax is dominant to dry earwax.
a)
0%
b)
25%
c)
50%
d)
100%
31.
Two mice heterozygous for red eyes mate. What is the expected genotypic ratio of their offspring?
Red eyes are dominant to not red eyes.
Red eyes are dominant to not red eyes.
a)
1 RR: 1 Rr: 1 rr
b)
0 RR: 4 Rr: 0 rr
c)
1 RR: 2 Rr: 1 rr
d)
1 RR: 1 Rr
32.
Black and white feathers in chickens show codominance to produce speckled chickens. If a black chicken mates with a speckled chicken, what percentage of the offspring will be black?
a)
100%
b)
75%
c)
50%
d)
25%
33.
Alleles that are inherited are the X chromosomes
a)
multiple alleles
b)
sex-linked genes
c)
codominance
d)
polygenic inheritance
34.
A person who is heterozygous for type A blood marries a person who has type O blood. They want to have children and would like to know what blood type their children could have. What would be the genotypic ratio of their offspring?
a)
1:1
b)
1:2:1
c)
3:1
d)
2:3:1
35.
Use the pedigree to determine if the shaded-in trait is a dominant trait, a recessive trait, or a sex-linked trait.
a)
Dominant
b)
Recessive
c)
Sex-linked
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