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WorksheetsChap9 - Mendelian Genetics
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
2.
How many PAIRS of chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
3.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
4.
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
5.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
6.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
7.
What do you call the non-Mendelian inheritance pattern that states that neither trait is dominant and the traits appear to blend together?
a)
Codominance
b)
Incomplete dominance
c)
Polygenic traits
8.
In butterfly bushes, dark purple and pink parents will produce offspring with lavender flowers. This is a result of
a)
codominance
b)
incomplete dominance
c)
complete dominance
d)
recessive dominance
9.
The observable traits of an organism are known as its
a)
allele
b)
dominance
c)
phenotype
d)
genotype
10.
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
11.
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%
12.
In dragons, large scales (S) are dominant and small scales (s) are recessive. A dragon that is heterozygous for the trait is crossed with a dragon that has small scales. What should be the ratio of large-scaled dragons to small-scaled dragons among the offspring?
a)
1:2
b)
1:1
c)
2:1
d)
3:1
13.
Mendel discovered principles of inheritance because he:
a)
observed simultaneously all of the characteristics in which the parents differed
b)
ignored all characteristics except a few markedly contrasting ones which he studied carefully
c)
studied only the offspring obtained from a single mating
d)
was smarter than any other scientist of his time
14.
The gene makeup of an organism for a particular trait is known as its
a)
dominance
b)
phenotype
c)
allele
d)
genotype
15.
Which is the correct phenotype for this organism?
a)
BB
b)
blue
c)
green
d)
bb
16.
What is the genotype for this organism?
(E= 3 eyes, e= 1 eye)
(E= 3 eyes, e= 1 eye)
a)
EE
b)
Ee
c)
ee
d)
EE or Ee
17.
A phenotype is the...
a)
letter combination
b)
dominant gene
c)
recessive gene
d)
physical appearance
18.
Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
19.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
20.
Which represents the genotype of a homozygous condition?
a)
Bb
b)
BC
c)
bb
d)
bc
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