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WorksheetsGenetics
Total questions: 29
Worksheet time: 47mins
Name
Class
Date
1.
A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?
a)
100% BB
b)
75% BB and 25%Bb
c)
50 % BB and 50% Bb
d)
50% Bb and 50% bb
2.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
3.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
4.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
5.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
6.
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%
7.
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
8.
What is the percentage of offspring that have green pods?
a)
100%
b)
75%
c)
50%
d)
25%
9.
What percentage of the offspring in the punnett square are shown as a hybrid?
a)
100%
b)
75%
c)
50%
d)
25%
10.
Which process and type of resulting cells are represented?
a)
mitosis, gametes
b)
mitosis, body cells
c)
meiosis, gametes
d)
meiosis, body cells
11.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
12.
What is a phenotype?
a)
The expression of a trait; what you see.
b)
refers to the genetic makeup of an individual
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
13.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
14.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
15.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
16.
B - black, b - brown. Two black mice mate and have some black and some brown mice. What is the genotype of the parents?
a)
BB x Bb
b)
BB x bb
c)
Bb x Bb
d)
Bb x bb
17.
Polygenic means that _________ control a characteristic.
a)
multiple genes
b)
single genes
c)
only 2 genes
d)
no genes
18.
Which of the following is NOT and example of homozygous?
a)
BB
b)
bb
c)
Bb
19.
G = green, g = yellow
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
20.
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).
Cross a black fowl with a white fowl. What is the phenotype ratio?
Cross a black fowl with a white fowl. What is the phenotype ratio?
a)
4 black: 0 grey: 0 white
b)
2 black: 2 grey: 0 white
c)
0 black: 4 grey: 0 white
d)
0 black: 2 grey: 2 white
21.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
22.
A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?
a)
3/16
b)
4/16
c)
8/16
d)
12/16
23.
Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
a)
0/16
b)
4/16
c)
8/16
d)
16/16
24.
What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits?
a)
1/16
b)
4/16
c)
8/16
d)
3/16
25.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
26.
If Patrick is a homozygous dominant for tall head, and marries Patty, who in homozygous recessive for short head, then their children would have the genotype of...
a)
TT
b)
tt
c)
Tt
27.
Widow's peak is dominant over a straight hairline. What percent of offspring will have widow's peak if we cross a father heterozygous for widow's peak and a mom with a straight hairline?
a)
0%
b)
25%
c)
50%
d)
75%
28.
Hairy tomato plants are dominant to hairless ones. Cross a homozygous hairy plant with a heterozyous plant.
What percentage of offspring are hh?
What percentage of offspring are hh?
a)
0%
b)
25%
c)
50%
d)
100%
29.
In shorthorn cattle, the gene for red coat color (R) is dominant over white color (W). The heterozygous combination is known as roan. Cross a roan bull with a roan cow.
What is the genotypic ratio of the F1 generation?
What is the genotypic ratio of the F1 generation?
a)
4 RR: 0 RW: 0 WW
b)
2 RR: 2 RW: 0 WW
c)
1 RR: 2 RW: 1 WW
d)
0 RR: 4 RW: 0 WW
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