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WorksheetsRetest Work Genetics & Punnett Squares
Total questions: 28
Worksheet time: 50mins
Name
Class
Date
1.
The different forms of a gene are called
a)
traits
b)
pollinators
c)
alleles
d)
hybrids
2.
A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:
a)
all black
b)
all white
c)
all gray
d)
speckled black and white
3.
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
4.
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
5.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
6.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
7.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
8.
Snap dragon color is a incomplete dominant trait. A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?
a)
Red
b)
Red and White
c)
White
d)
Pink
9.
In chickens, feather color is codominant. If a black chicken BB is mated with one that is black and white (BW) what are the chances of having a chicken that is black and white?
a)
50%
b)
0%
c)
25%
d)
100%
10.
In certain birds, black birds (BB) and white birds (bb) are homozygous. Heterozygous individuals are grey (Bb).
What is the genotype ratio for a cross between a grey birds and a white birds?
What is the genotype ratio for a cross between a grey birds and a white birds?
a)
2 BB: 2 Bb: 0 bb
b)
0 BB: 4 Bb: 0 bb
c)
0 BB: 2 Bb: 2 bb
d)
1 BB: 2 Bb: 1 bb
11.
In some carnations, flower color exhibits codominance. Identify the correct genotypes for red, white, and speckled carnations.
a)
Red = RR, white = rr, speckled = Rr
b)
Red = RR, white = WW, speckled = rw
c)
Red = RR, white = ww, Speckled = Rw
d)
Red = RR, white = WW, speckled = RW
12.
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
13.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
14.
AA and Aa always show up as
a)
dominant
b)
recessive
15.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
16.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
17.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
18.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
19.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
20.
What are the possible genotypes for this cross?
(Click the picture to see it without the text)
(Click the picture to see it without the text)
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
21.
If B is the dominant allele for brown hair, and b is for blonde hair
What is the phenotype for Bb?
What is the phenotype for Bb?
a)
Brown Hair
b)
Blonde Hair
c)
Brown and Blonde Hair
d)
Black Hair
22.
What are the blood types of the possible children that a woman (type O) and man (type AB) can have?
a)
O and AB
b)
O and A
c)
O and B
d)
A and B
23.
What is the genotypic ratio here?
a)
25% blue eye 75 % brown eye
b)
BB = 25% Bb = 50% bb = 25%
c)
BB= 50 % bb = 50%
d)
All brown eye
24.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
25.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
26.
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%
27.
In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?
a)
0%
b)
25%
c)
50%
d)
75%
28.
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%
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