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Worksheets

Genetics

Total questions: 21

Worksheet time: 40mins

Name
Class
Date
1.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
2.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
3.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
4.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
5.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
6.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
7.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
8.
In this punnett square, which is the dominant trait?
The B stands for bud.
a)
purple flower bud
b)
white flower bud
c)
dominant
d)
recessive
9.

Which of the following alleles is homozygous recessive?

a)
Tt
b)
tt
c)
TT
d)
t
10.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
11.

Which of the following is homozygous dominant?

a)
Yy
b)
Y
c)
yy
d)
YY
12.

In a Punnett square each box represents the probability of a(n) _______ trait.

a)

offspring's

b)

parent's

c)

gene's

d)

allele's

13.

A chart that shows all the possible combinations of alleles that can result from a genetic cross

a)
Gene
b)
Pedigree
c)
Punnett Square
d)
Dominant
14.

Where can the chromosome be found within the cell?

a)

mitocondria

b)

nucleus

c)
trait
d)

phenotype

15.
Heredity is the passing of traits from _____________________ to _____________________
a)
predators to prey
b)
water to rain
c)
parents to offspring
d)
fungi to protists
16.
What does the prefix hetero- in heterozygous mean?
a)
same
b)
different
c)
dating
d)
human
17.

What are the possible phenotype(s) of the offspring? (A-Brown hair; a-blond hair)

a)

50 % Brown Hair and 50% Blond Hair

b)

25 % Brown Hair and 75% Blond Hair

c)

75 % Brown Hair and 25% Blond Hair

d)

0% Brown Hair and 100% Blond Hair

18.

Which genotype below best fits in box 2?

a)
BB
b)
Bb
c)
bb
d)

bB

19.

What is the probability of heterozygous offspring?

a)

0%

b)

100%

c)

50%

d)

25%

20.

Capitol letters of an allele represent?

a)

Dominant

b)

Trait

c)

Recessive

d)

Percentage

21.

Each individual square is worth what percent?

a)

25%

b)

50%

c)

10%

d)

100%