WorksheetsGenetics REVISION punnett & pedigree
Total questions: 23
Worksheet time: 1hrs 9mins
Name
Class
Date
1.
This is a pedigree that follows blue eyes which is a recessive trait. What is the genotype of the father in generation 1?
a)
Bb
b)
BB
c)
bb
d)
B
2.
This is a pedigree that follows blue eyes which is a recessive trait. What is the genotype of child 1 in generation 3?
a)
BB
b)
bb
c)
Bb or bb
d)
Bb or BB
3.
Which term correctly describes an individual with a pair of the same alleles for a trait?
a)
homologous
b)
heterozygous
c)
homozygous
d)
heterologus
4.
An individual with two different alleles for a specific trait is said to be _____________.
a)
homozygous
b)
heterogenous
c)
homogenous
d)
heterozygous
5.
Of 12 hamsters just born, 9 have brown fur and 3 have white fur. The trait for white fur is considered to be ________.
a)
recessive
b)
weak
c)
strong
d)
dominant
6.
Phenotype refers to the _________ of an individual
a)
genetic makeup
b)
physical appearance
c)
recessive alleles
d)
dominant alleles
7.
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%
8.
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%
9.
How many females are in this pedigree?
a)
3
b)
4
c)
6
d)
7
10.
How many of the males in this pedigree show the trait being studied?
a)
2
b)
3
c)
4
d)
6
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.
If B = brown hair and b = blonde hair, what is the probability of brown hair?
a)
25%
b)
50%
c)
0%
d)
75%
13.
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
14.
Phenylketonuria (PKU) is inherited as a recessive condition. A man with PKU marries a woman without any alleles for PKU. What is the probability that their child will inherit PKU?
a)
0%
b)
25%
c)
50%
d)
75%
15.
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
16.
What do half colored symbols represent?
a)
The individual is a carrier.
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
17.
What does a horizontal line between a square and a circle mean?
a)
They are siblings
b)
They are cousins
c)
They are married/together
d)
They are the children
18.
A tall plant (Tt) is crossed with a short plant (tt). What is the phenotype of the offspring?
a)
75% tall; 25% short
b)
25% tall; 75% short
c)
50% tall; 50% short
d)
100% tall
19.
In the punnett square shown, what is the genotypes of the two parents?
a)
HH & HH
b)
Hh & Hh
c)
Hh & HH
d)
hh & hh
20.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
21.
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
22.
AA and Aa always show up as
a)
dominant
b)
recessive
23.
In the pedigree image, what is represented inside the red circle?
a)
Paternal (identical) twin boys
b)
Paternal (identical) twin girls
c)
Fraternal (non identical) twin girls
d)
Fraternal (non identical) twin boys
100 %
