WorksheetsPunnett and Pedigree
Total questions: 20
Worksheet time: 46mins
Name
Class
Date
1.
Which term correctly describes an individual with a pair of the same alleles for a trait?
a)
homologous
b)
heterozygous
c)
homozygous
d)
heterologus
2.
An individual with two different alleles for a specific trait is said to be _____________.
a)
homozygous
b)
heterogenous
c)
homogenous
d)
heterozygous
3.
Phenotype refers to the _________ of an individual
a)
genetic makeup
b)
physical appearance
c)
recessive alleles
d)
dominant alleles
4.
When the genotype consists of a dominant and a recessive allele, the phenotype will be like the ______________ allele.
a)
dominant
b)
recessive
c)
both
d)
neither
5.
Which of these would best be described as a phenotype?
a)
blue eyes
b)
mutation
c)
Bb
d)
Tt
6.
A pea plant is heterozygous for height (Tt) and it is crossed with a homozygous short (tt) plant. Use a Punnett square to determine the probability of one of their offspring being short.
a)
100%
b)
75%%
c)
50%
d)
25%
7.
One dog carries homozygous, long-haired traits (SS), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.
a)
100%
b)
75%
c)
50%
d)
25%
8.
How many females are in this pedigree?
a)
3
b)
4
c)
6
d)
7
9.
How many of the males in this pedigree show the trait being studied?
a)
2
b)
3
c)
4
d)
6
10.
When 2 pea plants heterozygous for height (Tt) are crossed, what is the ratio of the resulting genotypes (TT:Tt:tt)?
a)
1:2:1
b)
2:1:1
c)
0:3:1
d)
0:2:2
11.
Look at the Punnett square. If the two parents represented in the Punnett square have four offspring, what does the Punnett square tells you?
a)
two of the offspring will definitely be heterozygous.
b)
one of the offspring will definitely show the recessive trait.
c)
there is a 50% chance for each of the 4 offspring to have the genotype Rr.
d)
there is a greater chance for the offspring to be RR than rr.
12.
Which genotype is heterozygous?
a)
HH
b)
Hh
c)
hh
13.
Which genotype is homozygous dominant?
a)
HH
b)
Hh
c)
hh
14.
How many individuals are there in the 3rd generation?
a)
2
b)
3
c)
4
d)
6
15.
Give the genotype for person III-3
a)
GG
b)
Gg
c)
gg
16.
Give the genotype for person II-1
a)
GG
b)
Gg
c)
gg
17.
What does an open circle represent?
a)
Not Affected Male
b)
Not Affected Female
c)
Affected Male
d)
Affected Female
18.
Is this trait (the shaded individuals) dominant or recessive?
a)
dominant
b)
recessive
19.
What is this?
a)
Pedigree
b)
Karyotype
c)
Venn diagram
d)
Punnett Square
20.
What do we use pedigrees for?
a)
To look at families
b)
To make determinations about the offspring
c)
To track traits in families
d)
Nothing
100 %
