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WorksheetsBasic Genetics
Total questions: 30
Worksheet time: 1hrs 19mins
Name
Class
Date
1.
Having two of the same genes for the trait (TT, tt); Both dominant or both recessive.
a)
homozygous or purebred
b)
heterozygous or hybrid
c)
twin offspring
d)
pairs of chromosomes
2.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
3.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
4.
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%
5.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
6.
Aa is
a)
homozygous (purebred)
b)
heterozygous (hybrid)
7.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
8.
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
9.
T = tall an t = short
TT and Tt would result in the following phenotype
TT and Tt would result in the following phenotype
a)
short
b)
tall
c)
medium sized
d)
neither tall or short
10.
Who is considered the "father of genetics"?
a)
Gregor Mendel
b)
Reginald Punnett
c)
James Watson
d)
Justin Bieber
11.
The scientific study of heredity is ____.
a)
Genetics
b)
Punnett squares
c)
Inheritance
d)
Biology
12.
If one stronger trait "covers" up another weaker trait, the trait that covers the other is said to be:
a)
Dominant
b)
Heterozygous
c)
Recessive
d)
Hidden
13.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
14.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
15.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
16.
AA and Aa always show up as
a)
dominant
b)
recessive
17.
aa always shows up as
a)
dominant
b)
recessive
18.
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
19.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
20.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
21.
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
22.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
23.
____ occurs when pollen is transferred from the anther of the flower to the stigma.
a)
Pollination
b)
Appearance
c)
Control
d)
Multiplication
24.
Some plants may be able to self- or cross-pollinate.
a)
True
b)
False
25.
What are the three generations that were established by Mendel?
a)
P, M, C
b)
1, 2, 3
c)
A, B1, B2
d)
P, F1, F2
26.
The study of the structure and function of chromosomes and genes is ___.
a)
genetics
b)
chemistry
c)
molecular genetics
d)
chromosomal genetics
27.
____ is the likelihood that a specific event will occur.
a)
Cross
b)
Probability
c)
Ratio
d)
Independent assortment
28.
A dihybrid cross involves only one trait.
a)
True
b)
False
29.
___ occurs when both alleles for a gene are expressed in a heterozygous offspring.
a)
Dominance
b)
Codominance
c)
Complete dominance
d)
Incomplete dominance
30.
___ is where two or more alleles influence the phenotype.
a)
Dominance
b)
Codominance
c)
Complete dominance
d)
Incomplete dominance
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