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WorksheetsMendelian Genetics
Total questions: 18
Worksheet time: 39mins
Name
Class
Date
1.
In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?
a)
100%
b)
75%
c)
50%
d)
25%
2.
The observable traits of an organism are known as its
a)
allele
b)
dominance
c)
phenotype
d)
genotype
3.
Each parent contributes one of the genes for a particular trait. The genes of the pair are called:
a)
variables
b)
gametes
c)
hybrids
d)
alleles
4.
In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are homozygous for the recessive allele, the percent of offspring expected to exhibit tallness is
a)
25%
b)
75%
c)
100%
d)
0%
5.
The color black is dominant in guinea pigs. The phenotypes of homozygous black guinea pigs and heterozygous black guinea pigs are:
a)
black
b)
gray
c)
BB and Bb
d)
white
6.
The gene makeup of an organism for a particular trait is known as its
a)
dominance
b)
phenotype
c)
allele
d)
genotype
7.
What is the percentage of homozygous recessive offspring?
a)
0%
b)
25%
c)
50%
d)
75%
8.
Green peas are dominant (G) to yellow peas (g). What is the genotype for a hetereozygous dominant offspring?
a)
Gg
b)
gg
c)
GG
9.
In Mendel's pea plants, the homozygous recessive phenotype was white flowers. If Mendel crossed two homozygous recessive pea plants, what color flowers would be seen in the offspring?
a)
white and purple
b)
white
c)
purple
d)
lavendar
10.
What percentage of the offspring will be purebred dominant?
a)
0%
b)
25%
c)
50%
d)
75%
11.
Dominant alleles are represented by a(n)
a)
phenotype
b)
lower case letter
c)
upper case letter
d)
punnett square
12.
True or False:
A heterozygous dominant trait can be written as BB.
A heterozygous dominant trait can be written as BB.
a)
True
b)
False
13.
D = dimples d = no dimples
What is the genotype for a homozygous recessive offspring?
What is the genotype for a homozygous recessive offspring?
a)
DD
b)
Dd
c)
dd
14.
What is the percentage of a homozyogus dominant offspring?
a)
75%
b)
50%
c)
25%
d)
0%
15.
Round (R) seeds are dominant to wrinkled (r) seeds.
What is the genotype for a homozygous dominant offspring?
What is the genotype for a homozygous dominant offspring?
a)
RR
b)
Rr
c)
rr
16.
If two purebred species (BB) are crossed, what percentage of their offspring would be BB?
a)
25%
b)
50%
c)
75%
d)
100%
17.
What percentage of the offspring will be heterozygous dominant?
a)
100%
b)
75%
c)
50%
d)
25%
18.
What percentage of the possible offspring will be hybrids?
a)
25%
b)
50%
c)
75%
d)
100%
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