WorksheetsHeredity Grade 7
Total questions: 20
Worksheet time: 22mins
Name
Class
Date
1.
Black fur is dominant (B) over white fur (b). Find the probability of heterozygous offspring using the following genotype of these parents.
Bb + bb
Bb + bb
a)
0%
b)
25%
c)
50%
d)
100%
2.
Gregor Mendel is often called ....
a)
The father of heredity.
b)
The father of genetics.
c)
The king of peas
d)
The father of punnett squares.
3.
What are genes?
a)
Something you wear.
b)
Segments of DNA that carry traits for offspring.
c)
The powerhouse of cells.
d)
None of the above.
4.
An organism with two different alleles for a trait is said to be...
a)
recessive
b)
dominant
c)
hybrid
d)
purebred
5.
What would be the results of a genetic cross between the following parents? TT + Tt
a)
Tt, tt, tt, tt
b)
TT, TT, TT, Tt
c)
Tt, Tt, Tt, TT
d)
TT, TT, Tt, Tt
6.
It is NOT possible for two purebred black rabbits (both BB) to produce white offspring.
a)
True
b)
False
7.
Which of the following is an example of phenotype?
a)
bb
b)
blue eyes
8.
What are the genotypes for a tall plant (T) over a short plant (t)?
a)
TT
b)
tt
c)
TT, Tt
d)
TT, tt
9.
Which of the following genotypes are purebred?
a)
Pf
b)
Pp
c)
PP
d)
pP
10.
If you cross a black guinea pig with a white guinea pig and the offspring are gray, what type of dominant trait would that be.
a)
incomplete dominance
b)
codominance
c)
codependant
d)
cooperative
11.
If you are purebred dominant for a trait, your genotype would be...
a)
Tt
b)
TT
c)
tt
d)
tall
12.
Which of these is homozygous recessive?
a)
Rr
b)
rR
c)
RR
d)
rr
13.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
14.
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%
15.
Which of the following is heterozygous
a)
FF
b)
tt
c)
Gg
d)
RR
16.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
17.
If B is 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
18.
The two-letter code that describes the genetic traits of an organism is called a-
a)
Phenotype
b)
Genotype
c)
Physical Appearance
d)
Intelligence
19.
The different forms of a gene are called
a)
traits
b)
chromosomes
c)
alleles
d)
peas
20.
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
100 %
