WorksheetsUnit 8 Review: Punnett And Pedigrees
Total questions: 20
Worksheet time: 59mins
Name
Class
Date
1.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
2.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
3.
If B = brown hair and b = blonde hair, what is the probability of brown hair?
a)
25%
b)
50%
c)
0%
d)
75%
4.
In certain species of plants, purple flowers (P) are dominant to white flowers (p). If two heterozygous plants are crossed, what will be the phenotype of the offspring?
a)
100% purple flowers
b)
100% white flowers
c)
75% white flowers, 25% purple flowers
d)
25% white flowers, 75% purple flowers
5.
Black hair color is dominant to white hair color in mice. Determine the phenotypic ratio for the offpring of a heterozygous black mouse and a white mouse.
a)
4 Black: 0 White
b)
3 Black: 1 White
c)
2 Black: 2 White
d)
0 Black: 4 White
6.
Give the genotype for person III-3
a)
GG
b)
Gg
c)
gg
7.
Give the genotype for person II-1
a)
GG
b)
Gg
c)
gg
8.
What does a filled in square represent?
a)
Not affected Female
b)
Not affected Male
c)
Affected Male
d)
Affected Female
9.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)
8
b)
5
c)
2
d)
3
10.
What does an open circle represent?
a)
Not Affected Male
b)
Not Affected Female
c)
Affected Male
d)
Affected Female
11.
Which term correctly describes an individual with a pair of the same alleles for a trait?
a)
homologous
b)
heterozygous
c)
homozygous
d)
heterologus
12.
An individual with two different alleles for a specific trait is said to be _____________.
a)
homozygous
b)
heterogenous
c)
homogenous
d)
heterozygous
13.
Which of these would best be described as a phenotype?
a)
blue eyes
b)
mutation
c)
Bb
d)
Tt
14.
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%
15.
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%
16.
How many females are in this pedigree?
a)
3
b)
4
c)
6
d)
7
17.
How many of the males in this pedigree show the trait being studied?
a)
2
b)
3
c)
4
d)
6
18.
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.
19.
Which genotype is heterozygous?
a)
HH
b)
Hh
c)
hh
20.
Which genotype is homozygous dominant?
a)
HH
b)
Hh
c)
hh
100 %
