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WorksheetsGenetics
Total questions: 50
Worksheet time: 3hrs 35mins
Name
Class
Date
1.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
2.
How many alleles (letters) 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
5.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
6.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
7.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
8.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other 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
9.
AA and Aa always show up as
a)
dominant
b)
recessive
10.
aa always shows up as
a)
dominant
b)
recessive
11.
Aa is
a)
homozygous
b)
heterozygous
12.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
13.
What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
14.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
15.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
16.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
17.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
18.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
19.
Which of the characteristics is a lion least likely to pass on to its offspring?
a)
fur color
b)
length of tail
c)
scars on leg
d)
body size
20.
What gender has an X and a Y chromosome?
a)
male
b)
female
c)
transgender
d)
all of the above
21.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
22.
What is a phenotype?
a)
The expression of a trait; what you see.
b)
refers to the genetic makeup of an individual
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
23.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
24.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
25.
An allele whose trait always shows up in the organism when the allele is present.
a)
recessive allele
b)
dominant allele
c)
hidden allele
d)
present allele
26.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
27.
Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.
a)
DNA
b)
protein
c)
RNA
d)
glucose nucleic acid (GNA)
28.
What characteristic would a child not inherit from parents?
a)
freckles
b)
eye color
c)
hair style
d)
dimples
29.
A human usually has _____ total chromosomes.
a)
6
b)
22
c)
4
d)
46
30.
Which of the following alleles is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
31.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
32.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
33.
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
34.
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
In the punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
35.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
36.
How many daughter cells are produced in meiosis?
a)
4 daughter cells
b)
none of these
c)
3
d)
1
37.
Does the number of chromosomes change in meiosis?
a)
no
b)
none of these
c)
yes
38.
Does the number of chromosomes change in meiosis?
a)
no
b)
none of these
c)
yes
39.
Does meiosis reproduce asexually or sexually?
a)
sexually
b)
asexually
40.
The passing of traits from parents to offspring is
a)
probability
b)
recessive
c)
mitosis
d)
heredity
41.
Two forms of the same gene are called
a)
chromosomes
b)
genotypes
c)
phenotypes
d)
alleles
42.
If you cross 2 birds with genotype Gg how many possible genotypes are possible in the offspring
a)
1
b)
2
c)
3
d)
4
43.
The inherited combination of alleles is known as the offspring's
a)
heredity
b)
phenotype
c)
genotype
d)
redigree
44.
An organism's appearance is known as its
a)
heredity
b)
phenotype
c)
genotype
d)
pedigree
45.
___ used plants to study how traits move from parents to offspring
a)
Mendel
b)
Punnet
c)
Nye
d)
Ventor
46.
Sex cells are produced through the process of
a)
mitosis
b)
cytokinesis
c)
binary fission
d)
meiosis
47.
These may be dominant or recessive
a)
alleles
b)
phenotypes
c)
sex cell
d)
Punnett Squares
48.
___ developed a square that is used to see all the possible combinations of a genetic cross
a)
Mendel
b)
Punnett
c)
Nye
d)
Ventor
49.
What is the probability of having a boy for your second child if you already have a boy?
a)
100%
b)
50%
c)
25%
d)
75%
50.
What is the Chromosomal Theory of Inheritance?
a)
Chromosomes are carried from parents to offspring on hybrids
b)
Genes are carried from parents to offspring on chromosomes
c)
Hybrid paris of chromosomes combine to form offspring
d)
Codominant genes combine to form new hybrids
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